Document and Entity Information (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	May 22, 2015	Sep. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Registrant Name	AMERICAN SUPERCONDUCTOR CORP /DE/
Trading Symbol	AMSC
Entity Central Index Key	0000880807
Current Fiscal Year End Date	--03-31
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Common Stock, Shares Outstanding		13,863,254
Entity Public Float			$ 99.0

Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Current assets:
Cash and cash equivalents	$ 20,490	$ 43,114
Accounts receivable, net	9,879	7,556
Inventory	20,596	20,694
Prepaid expenses and other current assets	10,764	9,004
Restricted cash	2,822	2,913
Total current assets	64,551	83,281
Property, plant and equipment, net	56,097	64,574
Intangibles, net	1,422	1,995
Restricted cash	1,236	3,394
Deferred tax assets	7,766	7,724
Other assets	2,753	7,541
Total assets	133,825	168,509
Current liabilities:
Accounts payable and accrued expenses	21,615	21,764
Note payable, current portion, net of discount of $244 as of March 31, 2015 and $555 as of March 31, 2014	3,756	6,240
Derivative liabilities	2,999	2,601
Deferred revenue	11,019	9,456
Deferred tax liabilities	7,843	7,761
Total current liabilities	47,232	47,822
Note payable, net of discount of $290 as of March 31, 2015 and $287 as of March 31, 2014	3,877	6,380
Deferred revenue	2,756	990
Other liabilities	67	1,058
Total liabilities	53,932	56,250
Commitments and contingencies (Note 13)
Stockholders' equity:
Common stock, $0.01 par value, 75,000,000 and 150,000,000 shares authorized; 9,624,275 and 7,892,990 shares issued at March 31, 2015 and 2014, respectively	96	79
Additional paid-in capital	985,921	967,100
Treasury stock, at cost, 34,067 and 5,705 shares at March 31, 2015 and 2014, respectively	(771)	(370)
Accumulated other comprehensive (loss) income	(308)	1,839
Accumulated deficit	(905,045)	(856,389)
Total stockholders' equity	79,893	112,259
Total liabilities and stockholders' equity	$ 133,825	$ 168,509

Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	150,000,000
Common stock, shares issued	9,624,275	7,892,990
Treasury Stock, shares	34,067	5,705
Note Payable Current
Note payable, Unamortized Discount	$ 244	$ 555
Note Payable Noncurrent
Note payable, Unamortized Discount	$ 290	$ 287

Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Revenues	$ 70,530	$ 84,117	$ 87,419
Cost and operating expenses:
Cost of revenues	67,442	72,858	71,937
Research and development	11,878	12,173	15,325
Selling, general and administrative	29,217	37,230	49,652
Arbitration award expense	8,987
Restructuring and impairments	5,366	2,998	7,922
Amortization of acquisition related intangibles	157	287	324
Total operating expenses	123,047	125,546	145,160
Operating loss	(52,517)	(41,429)	(57,741)
Change in fair value of derivatives and warrants	3,963	1,872	7,556
Loss on extinguishment of debt		(5,197)
Interest expense, net	(1,882)	(9,661)	(14,948)
Other income (expense), net	1,596	(991)	(1,262)
Loss before income tax (benefit) expense	(48,840)	(55,406)	(66,395)
Income tax (benefit) expense	(184)	852	(264)
Net loss	$ (48,656)	$ (56,258)	$ (66,131)
Net loss per common share
Basic	$ (5.74)	$ (8.98)	$ (12.46)
Diluted	$ (5.74)	$ (8.98)	$ (12.46)
Weighted average number of common shares outstanding
Basic	8,477	6,262	5,307
Diluted	8,477	6,262	5,307

Consolidated Statements of Comprehensive (Loss) Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (48,656)	$ (56,258)	$ (66,131)
Other comprehensive (loss) income, net of tax:
Foreign currency translation (losses) gains	(2,147)	727	(887)
Unrealized losses on investments			(28)
Total other comprehensive income (loss), net of tax	(2,147)	727	(915)
Comprehensive loss	$ (50,803)	$ (55,531)	$ (67,046)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References+ Details

Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at Mar. 31, 2012	$ 164,879	$ 52	$ 897,071	$ (271)	$ 2,027	$ (734,000)
Balance, shares at Mar. 31, 2012		5,199,000
Exercise of stock options	2		2
Issuance of common stock - ESPP	290		290
Issuance of common stock - ESPP, shares		10,000
Issuance of common stock - restricted shares	1,619	2	1,617
Issuance of common stock - restricted shares, shares		246,000
Stock-based compensation expense	8,138		8,138
Issuance of stock for 401(k) match	539		539
Issuance of stock for 401(k) match, shares		16,000
Issuance of common stock to settle liabilities	16,739	6	16,733
Issuance of common stock to settle liabilities, shares, other		559,000
Repurchase of treasury stock	(42)			(42)
Net unrealized losses on investments	(28)				(28)
Cumulative translation adjustment	(887)				(887)
Net loss	(66,131)					(66,131)
Balance at Mar. 31, 2013	125,118	60	924,390	(313)	1,112	(800,131)
Balance, shares at Mar. 31, 2013		6,030,000
Issuance of common stock - ESPP	168		168
Issuance of common stock - ESPP, shares		10,000
Issuance of common stock - restricted shares	502	2	500
Issuance of common stock - restricted shares, shares		178,000
Stock-based compensation expense	10,696		10,696
Issuance of stock for 401(k) match	425		425
Issuance of stock for 401(k) match, shares		21,000
Issuance of common stock-ATM, net of costs	7,458	5	7,453
Issuance of common stock-ATM, net of costs, shares		487,000
Issuance of common stock to settle liabilities	23,480	12	23,468
Issuance of common stock to settle liabilities, shares, other		1,167,000
Repurchase of treasury stock	(57)			(57)
Cumulative translation adjustment	727				727
Net loss	(56,258)					(56,258)
Balance at Mar. 31, 2014	112,259	79	967,100	(370)	1,839	(856,389)
Balance, shares at Mar. 31, 2014		7,893,000
Issuance of common stock - ESPP	124		124
Issuance of common stock - ESPP, shares		17,000
Issuance of common stock - restricted shares		3	(3)
Issuance of common stock - restricted shares, shares		301,000
Stock-based compensation expense	5,936		5,936
Issuance of stock for 401(k) match	392		392
Issuance of stock for 401(k) match, shares		35,000
Issuance of common stock-ATM, net of costs	5,839	4	5,835
Issuance of common stock-ATM, net of costs, shares		375,000
Issuance of common stock-Hudson Bay Capital	5,225	9	5,216
Issuance of common stock-Hudson Bay Capital, shares		909,000
Issuance of common stock to settle liabilities	1,323	1	1,322
Issuance of common stock to settle liabilities, shares, other		94,000
Reverse stock split	(1)		(1)
Repurchase of treasury stock	(401)			(401)
Cumulative translation adjustment	(2,147)				(2,147)
Net loss	(48,656)					(48,656)
Balance at Mar. 31, 2015	$ 79,893	$ 96	$ 985,921	$ (771)	$ (308)	$ (905,045)
Balance, shares at Mar. 31, 2015		9,624,000

Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net loss	$ (48,656)	$ (56,258)	$ (66,131)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	9,554	10,615	13,054
Stock-based compensation expense	5,936	10,696	8,138
Impairment of long-lived and intangible assets	3,464	1,265	4,984
Provision for excess and obsolete inventory	1,386	316	2,230
Adverse purchase commitment losses (recoveries), net			(7,768)
Prepaid VAT reserve		1,426
Loss on minority interest investments	743	1,008	2,231
Change in fair value of derivatives and warrants	(3,963)	(1,872)	(7,556)
Loss on extinguishment of debt		5,197
Reversal of Catlin legal costs	(2,220)
Non-cash interest expense	566	7,713	12,426
Other non-cash items	(2,436)	1,980	3,329
Changes in operating asset and liability accounts:
Accounts receivable	(2,677)	11,379	(751)
Inventory	(1,887)	13,043	(6,457)
Prepaid expenses and other current assets	(2,330)	12,512	8,887
Accounts payable and accrued expenses	5,579	(10,861)	(21,864)
Deferred revenue	4,265	(21,426)	9,977
Net cash used in operating activities	(32,676)	(13,267)	(45,271)
Cash flows from investing activities:
Purchase of property, plant and equipment	(737)	(278)	(1,430)
Proceeds from the sale of property, plant and equipment	18	54	136
Proceeds from the maturity of marketable securities			5,276
Change in restricted cash	2,248	4,669	3,678
Change in other assets	280	(436)	(307)
Net cash provided by investing activities	1,809	4,009	7,353
Cash flows from financing activities:
Employee taxes paid related to net settlement of equity awards	(401)	(57)	(42)
Proceeds from the issuance of debt, net of expenses	1,422	9,842	32,895
Repayment of debt	(7,295)	(4,615)	(1,923)
Proceeds from public equity offering, net	14,933	7,458
Proceeds from exercise of employee stock options and ESPP	124	168	291
Net cash provided by financing activities	8,783	12,796	31,221
Effect of exchange rate changes on cash and cash equivalents	(540)	333	(339)
Net (decrease)/increase in cash and cash equivalents	(22,624)	3,871	(7,036)
Cash and cash equivalents at beginning of year	43,114	39,243	46,279
Cash and cash equivalents at end of year	20,490	43,114	39,243
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	362	864	(311)
Issuance of common stock to settle liabilities	1,715	24,407	18,896
Cash paid for interest	$ 1,362	$ 990	$ 787

Nature of the Business and Operations and Liquidity	12 Months Ended
Nature of the Business and Operations and Liquidity	Mar. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of the Business and Operations and Liquidity	1. Nature of the Business and Operations and Liquidity Nature of the Business and Operations American Superconductor Corporation (“AMSC” or the “Company”) was founded on April 9, 1987. The Company is a leading provider of megawatt-scale solutions that lower the cost of wind power and enhance the performance of the power grid. In the wind power market, the Company enables manufacturers to field wind turbines through its advanced engineering, support services and power electronics products. In the power grid market, the Company enables electric utilities and renewable energy project developers to connect, transmit and distribute power through its transmission planning services and power electronics, and superconductor-based products. The Company’s wind and power grid products and services provide exceptional reliability, security, efficiency and affordability to its customers. The Company’s consolidated financial statements have been prepared on a going concern basis in accordance with United States generally accepted accounting principles (“GAAP”) and the Securities and Exchange Commission’s (“SEC”) instructions to Form 10-Q. The going concern basis of presentation assumes that the Company will continue operations and will be able to realize its assets and discharge its liabilities and commitments in the normal course of business. On March 24, 2015, the Company effected a 1-for-10 reverse stock split of its common stock. Trading of the Company’s common stock reflected the reverse stock split beginning on March 25, 2015. Unless otherwise indicated, all historical references to shares of common stock, shares of restricted stock, restricted units, shares underlying options, warrants or calculations that use common stock for per share financial reporting have been adjusted for comparative purposes to reflect the impact of the 1-for-10 reverse stock split as if it had occurred at the beginning of the earliest period presented. Liquidity The Company has experienced recurring operating losses and as of March 31, 2015, the Company had an accumulated deficit of $905.0 million. In addition, the Company has experienced recurring negative operating cash flows. At March 31, 2015, the Company had cash and cash equivalents of $20.5 million. Cash used in operations for the year ended March 31, 2015 was $32.7 million. On August 29, 2014, the Arbitration Tribunal for the ICC International Court of Arbitration (the “ICC Court”) found the Company’s wholly-owned Austrian subsidiary, AMSC Austria GmbH (“AMSC Austria”), liable for damages in its breach of contract proceeding against Ghodawat Energy Pvt Ltd (“Ghodawat”) and awarded Ghodawat approximately €8.3 million plus interest of 5.33%, which accrued from the date of award. On February 4, 2015, AMSC Austria entered into a Settlement Agreement with Ghodawat, which provided for, among other things, (i) a payment by AMSC Austria to Ghodawat of €7.45 million, and (ii) upon payment by AMSC Austria to Ghodawat, the full settlement of any and all disputes and claims between the parties (including their respective parent and affiliated companies), in particular related to or arising out of the award. Cash used in operations for the year ended March 31, 2015 includes approximately $8.4 million for the payment of this liability. From April 1, 2011 through the date of this filing, the Company has reduced its global workforce substantially. As of March 31, 2015, the Company had a global workforce of 318 persons. The Company plans to closely monitor its expenses and if required, expects to further reduce operating costs and capital spending to enhance liquidity. Over the last several years, the Company has entered into several debt and equity financing arrangements in order to enhance liquidity. During the fiscal years ended March 31, 2015, 2014 and 2013, the Company generated aggregate cash flows from financing activities of $52.8 million. In addition, on April 29, 2015, the Company completed an additional equity offering, which generated net proceeds of approximately $22.3 million, after deducting underwriting discounts and commissions and estimated offering expenses payable by the Company. See Note 9, “Debt”, Note 12 “Stockholders Equity” and Note 19 “Subsequent Events” for further discussion of these financing arrangements. The Company believes that it is in compliance with the covenants and restrictions included in the agreements governing its debt arrangements as of March 31, 2015. The Company believes it has sufficient liquidity to fund its operations, capital expenditures and scheduled cash payments under its debt obligations for the next twelve months. The Company’s liquidity is highly dependent on, its ability to increase revenues, its ability to control its operating costs, its ability to maintain compliance with the covenants and restrictions on its debt obligations (or obtain waivers from its lender in the event of non-compliance), and its ability to raise additional capital, if necessary. There can be no assurance that the Company will be able to continue to raise additional capital from other sources or execute on any other means of improving liquidity described above. In addition, the Company is actively seeking to sell its minority investment in Tres Amigas, LLC, a Delaware limited liability Company (“Tres Amigas”). The Company no longer believes its investment in Blade Dynamics is recoverable and fully impaired its remaining investment in Blade Dynamics Ltd. (“Blade Dynamics”) during the three months ended September 30, 2014. (See Note 15, “Minority Investments”, for further information about such investments.) There can be no assurance that the Company will be able to sell these investments on commercially reasonable terms or at all.

Summary of Significant Accounting Policies

12 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions are eliminated. Certain reclassifications of prior years’ amounts have been made to conform to the current year presentation. These reclassifications had no effect on net income, cash flows from operating activities or stockholders’ equity.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles of the United States of America, (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. The Company bases its estimates on historical experience and various other factors believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. On an ongoing basis, the Company evaluates its estimates, including those related to revenue recognition, collectability of receivables, realizability of inventory, goodwill and intangible assets, warranty provisions, stock-based compensation, valuation of warrant and derivative liabilities, tax reserves, and deferred tax assets. Provisions for depreciation are based on their estimated useful lives using the straight-line method. Some of these estimates can be subjective and complex and, consequently, actual results may differ from these estimates under different assumptions or conditions. While for any given estimate or assumption made by the Company’s management there may be other estimates or assumptions that are reasonable, the Company believes that, given the current facts and circumstances, it is unlikely that applying any such other reasonable estimate or assumption would materially impact the financial statements.

Cash Equivalents

Cash equivalents consist of highly liquid instruments with maturities of three months or less that are regarded as high quality, low risk investments and are measured using such inputs as quoted prices, and are classified within Level 1 of the valuation hierarchy. Cash equivalents consist principally of certificates of deposits and money market accounts.

Accounts Receivable

Accounts receivable consist of amounts owed by commercial companies and government agencies. Accounts receivable are stated net of allowances for doubtful accounts. The Company’s accounts receivable relate principally to a limited number of customers. As of March 31, 2015, one customer, Inox Wind Limited (“Inox”), accounted for approximately 56% of the Company’s total receivable balance, with no other customer accounting for greater than 10% of the balance. As of March 31, 2014, three customers, Inox, CG Power Solutions UK Ltd (“CGPS”), and JCNE, accounted for approximately 20%, 14% and 13%, respectively, of the Company’s total receivable balance. Changes in the financial condition or operations of the Company’s customers may result in delayed payments or non-payments which would adversely impact its cash flows from operating activities and/or its results of operations. As such the Company may require collateral, advanced payment or other security based upon the customer history and/or creditworthiness. In determining the allowance for doubtful accounts, the Company evaluates the collectability of accounts receivable based primarily on the probability of recoverability based on historical collection and write-off experience, the age of past due receivables, specific customer circumstances, and current economic trends. If the financial condition of the Company’s customers were to deteriorate, resulting in an impairment of their ability to make payment, additional allowances may be required. Failure to accurately estimate the losses for doubtful accounts and ensure that payments are received on a timely basis could have a material adverse effect on the Company’s business, financial condition, results of operations, and cash flows.

Inventory

Inventories include material, direct labor and related manufacturing overhead, and are stated at the lower of cost or market determined on a first-in, first-out basis. The Company records inventory when it takes delivery and title to the product according to the terms of each supply contract.

Program costs may be deferred and recorded as inventory on contracts on which costs are incurred in excess of approved contractual amounts and/or funding, if future recovery of the costs is deemed probable.

At each balance sheet date, the Company evaluates its ending inventories for excess quantities and obsolescence. Inventories that management considers excess or obsolete are reserved. Management considers forecasted demand in relation to the inventory on hand, competitiveness of product offerings, market conditions and product life cycles when determining excess and obsolescence and net realizable value adjustments. Once inventory is written down and a new cost basis is established, it is not written back up if demand increases.

For the years ended March 31, 2015 and 2014, the Company recorded inventory reserves of approximately $1.4 million and $0.3 million, respectively, based on evaluating its ending inventory on hand for excess quantities and obsolescence. For the years ended March 31, 2015, 2014, and 2013, the Company recorded benefits of $8.0 million, $4.3 million, and $2.1 million, respectively, for the usage of inventories previously reserved.

Property, Plant and Equipment

Property, plant and equipment are carried at cost less accumulated depreciation and amortization. The Company accounts for depreciation and amortization using the straight-line method to allocate the cost of property, plant and equipment over their estimated useful lives as follows:

Asset Classification		Estimated Useful Life in Years
Building		40
Process upgrades to the building		10-40
Machinery and equipment		3-10
Furniture and fixtures		3-5
Leasehold improvements		Shorter of the estimated useful life or the remaining lease term

Expenditures for maintenance and repairs are expensed as incurred. Upon retirement or other disposition of assets, the costs and related accumulated depreciation are eliminated from the accounts and the resulting gain or loss is reflected in operating expenses.

Valuation of Long-Lived Assets

The Company periodically evaluates its long-lived assets, consisting principally of fixed assets and amortizable intangible assets for potential impairment. In accordance with the applicable accounting guidance for the treatment of long-lived assets, the Company reviews the carrying value of its long-lived assets or asset group that is held and used, including intangible assets subject to amortization, for impairment whenever events and circumstances indicate that the carrying value of the assets may not be recoverable. Under the held and used approach, the asset or asset group to be tested for impairment should represent the lowest level for which identifiable cash flows are largely independent of the cash flows of other groups of assets and liabilities. The Company evaluates its long-lived assets whenever events or circumstances suggest that the carrying amount of an asset or group of assets may not be recoverable from the estimated undiscounted future cash flows.

During the fiscal years ended March 31, 2014 and 2013, in response to challenging liquidity and market conditions, the Company entered into and completed certain restructuring activities, approved by the Board of Directors, in order to reduce costs and align its strategic priorities. Since the restructuring action impacted all of its operations, management concluded that there were indicators of potential impairment of its long-lived assets in each of those fiscal years and the Company therefore conducted assessments of the recoverability of these assets by comparing its carrying value of the assets to the pre-tax undiscounted cash flows estimated to be generated by those assets over their remaining book useful lives. Based on the calculations performed by management, the sum of the undiscounted cash flows forecasted to be generated by certain assets were less than the carrying value of those assets. Therefore, there were indications that certain of its assets were impaired and, as a result, the Company performed additional analysis. An evaluation of the level of impairment was made by comparing the implied fair value of those definite long-lived tangible and intangible assets of each reporting unit against their carrying values.

The fair values of the impacted property and equipment were based on what the Company could reasonably expect to sell each asset from the perspective of a market participant. The determination of the fair value of its property and equipment includes estimates and judgments regarding the marketability and ultimate sales price of individual assets. The Company utilized market data and approximations from comparable analyses to arrive at the estimated fair values of the impacted property and equipment. The fair values of amortization intangible assets related to completed technology and trade names were determined using primarily the relief-from-royalty method over the estimated economic lives of those assets from the perspective of a market participant. During the year ended March 31, 2014, the Company determined that the fair values of those assets were greater than or equal to their carrying values and no impairment charge was recorded. During the year ended March 31, 2013, management determined that certain of its corporate assets and Grid segment property, plant and equipment were impaired as their carrying values exceeded their fair values. The Company determined the long-lived assets of its Wind segment were not impaired. Accordingly, for the year ended March 31, 2013, the Company recorded an impairment charge of $5.0 million on certain of its corporate assets and on certain of its Grid segment property, plant and equipment.

Equity Method Investments

The Company uses the equity method of accounting for investments in entities in which it has an ownership interest, but does not exercise a controlling interest in the operating and financial policies of an investee. Under this method, an investment is carried at the acquisition cost, plus the Company’s equity in undistributed earnings or losses since acquisition.

The Company periodically tests its investments for potential impairment whenever events and circumstances indicate a loss in the fair value of the investments may be other than temporary. During the years ended March 31, 2015 and 2014, the Company recorded impairment charges of $3.5 and $1.3 million, respectively, on its investment in Blade Dynamics Ltd. This minority investment is fully impaired as of March 31, 2015. (See Note 15, “Minority Investments”, for further discussion.)

Revenue Recognition

The Company recognizes revenue for product sales upon customer acceptance, which can occur at the time of delivery, installation or post-installation where applicable, provided persuasive evidence of an arrangement exists, delivery has occurred, the sales price is fixed or determinable and the collectability is reasonably assured. Existing customers are subject to ongoing credit evaluations based on payment history and other factors. If it is determined during the arrangement that collectability is not reasonably assured, revenue is recognized on a cash basis of accounting. Certain of the Company’s contracts involve retention amounts which are contingent upon meeting certain performance requirements through the expiration of the contract warranty periods. For contractual arrangements that involve retention, the Company recognizes revenue for these amounts upon the expiration of the warranty period, meeting the performance requirements and when collection of the fee is reasonably assured.

During the year ended March 31, 2011, the Company determined that revenues from certain of its customers in China could not be recorded for shipments made according to the delivery terms, as the fee was not fixed or determinable or collectability was not reasonably assured. For these customers, the Company is utilizing a cash basis of accounting with cash applied first against accounts receivable balances, then costs of shipments (inventory and value added taxes) before recognizing any gross margin. Payments of $3.7 million and $3.4 million were received from these customers during the years ended March 31, 2014 and 2013, respectively, for past shipments and recorded as revenue. There were no payments received for past shipments in the fiscal year ending March 31, 2015.

For certain arrangements, such as contracts to perform research and development, prototype development contracts and certain product sales, the Company records revenues using the percentage-of-completion method, measured by the relationship of costs incurred to total estimated contract costs. Percentage-of-completion revenue recognition accounting is predominantly used on certain turnkey power systems installations for electric utilities and long-term prototype development contracts with the U.S. government. The Company follows this method since reasonably dependable estimates of the revenues and costs applicable to various stages of a contract can be made. However, the ability to reliably estimate total costs at completion is challenging, especially on long-term prototype development contracts, and could result in future changes in contract estimates. For contracts where reasonably dependable estimates of the revenues and costs cannot be made, the Company follows the completed-contract method.

The Company enters into sales arrangements that may provide for multiple deliverables to a customer. Sales of certain products may include extended warranty and support or service packages, and at times include performance bonds. As these contracts progress, the Company continually assesses the probability of a payout from the performance bond. Should the Company determine that such a payout is likely; the Company would record a liability. The Company would reduce revenue to the extent a liability is recorded. In addition, the Company enters into licensing arrangements that include training services.

Deliverables are separated into more than one unit of accounting when (1) the delivered element(s) have value to the customer on a stand-alone basis, and (2) delivery of the undelivered element(s) is probable and substantially in the control of the Company. In general, revenues are separated between the different product shipments which have stand-alone value, and the various services to be provided. Revenue for product shipments is recognized in accordance with the Company’s policy for product sales, while revenues for the services are recognized over the period of performance. The Company has determined that the licenses have no standalone value to the customer and are not separable from training services as the Company can only fully transfer the technology knowhow through the training component. Accordingly, the Company accounts for these arrangements as a single unit of accounting, and recognizes revenue over the period of the Company’s performance and milestones that have been achieved. Costs for these arrangements are expensed as incurred. The Company identifies all goods and/or services that are to be delivered separately under a sales arrangement and allocates revenue to each deliverable based on the element’s fair value as determined by vendor-specific objective evidence (“VSOE”), which is the price charged when that element is sold separately, or third-party evidence (“TPE”). When VSOE and TPE are unavailable, fair value is based on the Company’s best estimate of selling price utilizing a cost plus reasonable margin consistent with how the Company has set pricing historically for similar products and services. When the Company’s estimates are used to determine fair value, management makes its estimates using reasonable and objective evidence to determine the price. The Company reviews VSOE and TPE at least annually. If the Company concludes it is unable to establish fair values for one or more undelivered elements within a multiple-element arrangement using VSOE then the Company uses TPE or the best estimate of the selling price for that unit of accounting, being the price at which the vendor would transact if the unit of accounting were sold by the vendor regularly on a standalone basis.

The Company has elected to record taxes collected from customers on a net basis and does not include tax amounts in revenue or costs of revenue.

Customer deposits received in advance of revenue recognition are recorded as deferred revenue until customer acceptance is received. Deferred revenue also represents the amount billed to and/or collected from commercial and government customers on contracts which permit billings to occur in advance of contract performance/revenue recognition.

Product Warranty

Warranty obligations are incurred in connection with the sale of the Company’s products. The Company generally provides a one to three year warranty on its products, commencing upon installation. The costs incurred to provide for these warranty obligations are estimated and recorded as an accrued liability at the time of sale. Future warranty costs are estimated based on historical performance rates and related costs to repair given products. The accounting estimate related to product warranty involves judgment in determining future estimated warranty costs. Should actual performance rates or repair costs differ from estimates, revision to the estimated warranty liability would be required.

Research and Development Costs

Research and development costs are expensed as incurred.

Income Taxes

The Company’s provision for income taxes is composed of a current and a deferred portion. The current income tax provision is calculated as the estimated taxes payable or refundable on tax returns for the current year. The deferred income tax provision is calculated for the estimated future tax effects attributable to temporary differences and carry-forwards using expected tax rates in effect in the years during which the differences are expected to reverse.

Deferred income taxes are recognized for the tax consequences in future years of differences between the tax bases of assets and liabilities and their financial reporting amounts at each fiscal year end based on enacted tax laws and statutory tax rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce net deferred tax assets to the amount expected to be realized. The Company has provided a valuation allowance against its U.S. and foreign deferred income tax assets since the Company believes that it is more likely than not that these deferred tax assets are not currently realizable due to uncertainty around profitability in the future.

Accounting for income taxes requires a two-step approach to recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if, based on the technical merits, it is more likely than not that the position will be sustained upon audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon ultimate settlement. The Company reevaluates these uncertain tax positions on a quarterly basis. This evaluation is based on factors including, but not limited to, changes in facts or circumstances, changes in tax law, effectively settled issues under audit and new audit activity. Any changes in these factors could result in the recognition of a tax benefit or an additional charge to the tax provision. The Company includes interest and penalties related to gross unrecognized tax benefits within the provision for income taxes. (See Note 11, “Income Taxes,” for further information regarding our income tax assumptions and expenses.)

The Company evaluates its permanent reinvestment assertions with respect to foreign earnings at each reporting period. The Company has not recorded a deferred tax asset for the temporary difference associated with the excess of the tax basis over its book basis in its Austrian subsidiary as the future tax benefit is not expected to reverse in the foreseeable future. The Company has recorded a deferred tax liability as of March 31, 2015 for the undistributed earnings of its remaining foreign subsidiaries for which it can no longer assert are permanently reinvested. The total amount of undistributed earnings available to be repatriated at March 31, 2015 was $1.2 million resulting in the recording of a $0.4 million net deferred federal and state income tax liability. (See Note 11, “Income Taxes,” for further information regarding our income tax assumptions and expenses.)

Stock-Based Compensation

The Company accounts for stock-based payment transactions using a fair value-based method and recognizes the related expense in the results of operations.

Stock-based compensation is estimated at the grant date based on the fair value of the award and is recognized as expense over the requisite service period of the award. The fair value of restricted stock awards is determined by reference to the fair market value of the Company’s common stock on the date of grant. The Company uses the Black-Scholes option pricing model to estimate the fair value of awards with service and performance conditions. For awards with service conditions only, the Company recognizes compensation cost on a straight-line basis over the requisite service/vesting period. For awards with performance conditions, accruals of compensation cost are made based on the probable outcome of the performance conditions. The cumulative effect of changes in the probability outcomes are recorded in the period in which the changes occur.

Determining the appropriate fair value model and related assumptions requires judgment, including estimating stock price volatilities of the Company’s common stock and expected terms. The expected volatility rates are estimated based on historical and implied volatilities of the Company’s common stock. The expected term represents the average time that the options that vest are expected to be outstanding based on the vesting provisions and the Company’s historical exercise, cancellation and expiration patterns.

The Company estimates pre-vesting forfeitures when recognizing compensation expense based on historical and forward-looking factors. Changes in estimated forfeiture rates and differences between estimated forfeiture rates and actual experience may result in significant, unanticipated increases or decreases in stock-based compensation expense from period to period. The termination of employment of certain employees who hold large numbers of stock-based awards may also have a significant, unanticipated impact on forfeiture experience and, therefore, on stock-based compensation expense. The Company will update these assumptions on at least an annual basis and on an interim basis if significant changes to the assumptions are warranted.

Computation of Net Loss per Common Share

Basic net loss per share (“EPS”) is computed by dividing net loss by the weighted-average number of common shares outstanding for the period. Diluted EPS is computed by dividing the net loss by the weighted-average number of common shares and dilutive common equivalent shares outstanding during the period, calculated using the treasury stock method. Common equivalent shares include the effect of restricted stock, exercise of stock options and warrants and contingently issuable shares. For the years ended March 31, 2015, 2014, and 2013, common equivalent shares of 1,567,352, 643,158, and 1,072,584, respectively, were not included in the calculation of diluted EPS as they were considered antidilutive. The following table reconciles the numerators and denominators of the EPS calculation for the years ended March 31, 2015, 2014, and 2013 (in thousands except per share amounts):

	Year ended March 31,
	2015			2014			2013

Numerator:
Net loss	$	(48,656	)	$	(56,258	)	$	(66,131	)
Denominator:
Weighted-average shares of common stock outstanding		8,559			6,411			5,354
Weighted-average shares subject to repurchase		(82	)		(149	)		(47	)
Shares used in per-share calculation ― basic		8,477			6,262			5,307
Shares used in per-share calculation ― diluted		8,477			6,262			5,307
Net loss per share ― basic	$	(5.74	)	$	(8.98	)	$	(12.46	)
Net loss per share ― diluted	$	(5.74	)	$	(8.98	)	$	(12.46	)

Foreign Currency Translation

The functional currency of all the Company’s foreign subsidiaries is the U.S. dollar, except for AMSC Austria, for which the local currency (Euro) is the functional currency, and AMSC China, for which the local currency (Renminbi) is the functional currency. The assets and liabilities of AMSC Austria and AMSC China are translated into U.S. dollars at the exchange rate in effect at the balance sheet date and income and expense items are translated at average rates for the period. Cumulative translation adjustments are excluded from net loss and shown as a separate component of stockholders’ equity. Net foreign currency gains (losses) are included in net loss and were $2.8 million, ($0.1) million, and $1.0 million for the years ended March 31, 2015, 2014 and 2013, respectively. The Company has no restrictions on the foreign exchange activities of its foreign subsidiaries, including the payment of dividends and other distributions.

Risks and Uncertainties

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could materially differ from those estimates and would impact future results of operations and cash flows.

The Company invests its available cash with high-credit, quality financial instruments and invests primarily in investment-grade marketable securities, including, but not limited to, government obligations, money market funds and corporate debt instruments.

Several of the Company’s government contracts are being funded incrementally, and as such, are subject to the future authorization, appropriation, and availability of government funding. The Company has a history of successfully obtaining financing under incrementally-funded contracts with the U.S. government and it expects to continue to receive additional contract modifications in the year ending March 31, 2015 and beyond as incremental funding is authorized and appropriated by the government.

Contingencies

From time to time, the Company may be involved in legal and administrative proceedings and claims of various types. The Company records a liability in its consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. Management reviews these estimates in each accounting period as additional information is known and adjusts the loss provision when appropriate. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in the consolidated financial statements. If, with respect to a matter, it is not both probable to result in liability and the amount of loss cannot be reasonably estimated, an estimate of possible loss or range of loss is disclosed unless such an estimate cannot be made. The Company does not recognize gain contingencies until they are realized. Legal costs incurred in connection with loss contingencies are expensed as incurred. During the fiscal year ended March 31, 2015, the Company reversed legal expenses of approximately $2.2 million incurred in connection with the Ghodawat arbitration that were covered by the Catlin settlement. The Company recorded a loss contingency of $1.8 million for the year ended March 31, 2013. (See Note 13, “Commitments and Contingencies,” for further information regarding the Company’s pending litigation.)

Debt

For debt arrangements, the Company considers any embedded equity-linked components and accounts for the fair value of any embedded warrants and derivatives. The Company elects not to use the fair value option for recording debt arrangements and elects to record the debt at the stated value of the loan agreement on the date of issuance. Any other elements present are reviewed to determine if they are embedded derivatives requiring bifurcation and requiring valuation under the fair value option. Derivatives and warrants, which meet the condition to satisfy an obligation by issuing a variable number of equity shares, are recorded at fair value. The carrying value assigned to the host instrument will be the difference between the previous carrying value of the host instrument and the fair value of the warrants and derivatives. There is no immediate gain/loss from the initial recognition and measurement if the embedded derivative is accounted for separately from its host contract. There is an offsetting debt discount or premium as a result of the fair value assigned to the warrants and derivatives, as well as any debt issuance costs, which is amortized under the effective interest method over the term of the loan. Each reporting period, fair value is assessed for the warrants and derivatives with the change in value being recorded as other income/loss. (See Note 9, “Debt,” and Note 10, “Warrants and Derivative Liabilities,” for a full discussion regarding the activity and financial impact for the Company’s debt, warrants and derivative liabilities.)

Disclosure of Fair Value of Financial Instruments

The Company’s financial instruments consist principally of cash and cash equivalents, accounts receivable, accounts payable, accrued expenses, warrants to purchase shares of common stock, derivatives, a senior convertible note and senior secured term loan. The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable, and accrued expenses due to their short nature approximate fair value at March 31, 2015 and 2014. The estimated fair values have been determined through information obtained from market sources and management estimates. The fair value for the debt and warrant arrangements have been estimated by management based on the terms that it believes it could obtain in the current market for debt with the same terms and similar maturities and is further supported by the December 2014 amendments to the senior secured term loan with similar terms and interest rate. The Company classifies the estimates used to fair value these instruments as Level 3 inputs (See Note 3, “Fair Value Measurements” for a full discussion on fair value measurements.)

- Definition

The entire disclosure for all significant accounting policies of the reporting entity.

+ References+ Details

Fair Value Measurements

12 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

3. Fair Value Measurements

A valuation hierarchy for disclosure of the inputs to valuation used to measure fair value has been established. This hierarchy prioritizes the inputs into three broad levels as follows:

Level 1	-	Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

Level 2	-	Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs).

Level 3	-	Unobservable inputs that reflect the Company’s assumptions that market participants would use in pricing the asset or liability. The Company develops these inputs based on the best information available, including its own data.

The Company provides a gross presentation of activity within Level 3 measurement roll-forward and details of transfers in and out of Level 1 and 2 measurements. A change in the hierarchy of an investment from its current level is reflected in the period during which the pricing methodology of such investment changes. Disclosure of the transfer of securities from Level 1 to Level 2 or Level 3 is made in the event that the related security is significant to total cash and investments. The Company did not have any transfers of assets and liabilities between Level 1 and Level 3 of the fair value measurement hierarchy during the fiscal years ended March 31, 2015 and 2014.

A financial asset’s or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

The following table provides the assets and liabilities carried at fair value, measured as of March 31, 2015 and 2014 (in thousands):

	Total		Quoted Prices in		Significant Other		Significant
	Carrying		Active Markets		Observable Inputs		Unobservable Inputs
	Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2015:
Assets:
Cash equivalents	$	12,519	$	12,519	$	-	$	-
Derivative liabilities:
Warrants	$	2,999	$	-	$	-	$	2,999

	Total		Quoted Prices in		Significant Other		Significant
	Carrying		Active Markets		Observable Inputs		Unobservable Inputs
	Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2014:
Assets:
Cash equivalents	$	17,675	$	17,675	$	-	$	-
Derivative liabilities:
Warrants	$	2,601	$	-	$	-	$	2,601

The table below reflects the activity for the Company’s major classes of liabilities measured at fair value (in thousands):


				Warrants
April 1, 2014				$	2,601
Warrant issuance with equity offering					4,255
Warrant issuance with senior secured term loan					106
Mark to market adjustment					(3,963	)
Balance at March 31, 2015				$	2,999

	Derivative
	Liability			Warrants
April 1, 2013	$	529		$	3,633
Warrant issuance with senior secured term loan		-			315
Mark to market adjustment		(525	)		(1,347	)
Extinguishment of derivative liability		(4	)		-
Balance at March 31, 2014	$	-		$	2,601

The following table provides the assets and liabilities measured at fair value on a non-recurring basis, as of March 31, 2014 (in thousands). During the year ended March 31, 2015 the following asset was determined to be no longer recoverable and was fully impaired. See note 15, “Minority Investments” for further details:

	Total		Quoted Prices in	Significant Other	Significant
	Carrying		Active Markets	Observable Inputs	Unobservable Inputs
	Value		(Level 1)	(Level 2)	(Level 3)
March 31, 2014:
Assets:
Investment in unconsolidated entity – Blade Dynamics	$	3,690	$	$	$	3,690

Valuation Techniques

Cash Equivalents

Warrants

Warrants were issued in conjunction with a Securities Purchase Agreement with Capital Ventures International (“CVI”), an equity offering to Hudson Bay Capital in November 2014, and a Loan and Security Agreement with Hercules Technology Growth Capital, Inc (“Hercules”). (See Note 9, “Debt,” and Note 10 “Warrants and Derivative Liabilities,” for additional information.) These warrants are subject to revaluation at each balance sheet date, and any change in fair value will be recorded as a change in fair value in derivatives and warrants until the earlier of their exercise or expiration.

The Company relies on various assumptions in a lattice model to determine the fair value of warrants. The Company has valued the warrants within Level 3 of the valuation hierarchy. (See Note 10, “Warrants and Derivative Liabilities,” for a discussion of the warrants and the valuation assumptions used.)

Minority Investment

The Company accounts for the minority investment in Blade Dynamics on a cost basis (See Note 15, “Minority Investments”). During the year ended March 31, 2014, the Company determined that as a result of its efforts to sell its investment in Blade Dynamics, certain indicators of impairment existed which required the Company to perform further analysis. Based on analysis which included potential sale scenarios of the investment, the Company recorded an impairment charge of approximately $1.3 million and reported the investment at its estimated fair value as of March 31, 2014.

During the year ended March 31, 2015, the Company determined that as a result of a dilutive financing which resulted in the Company losing certain of its shareholder rights, as well as certain operational issues and adverse changes to the potential sale scenarios previously considered, its investment in Blade Dynamics was no longer recoverable and therefore recorded a charge of $3.5 million to fully impair the investment.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References+ Details

Accounts Receivable

12 Months Ended

Mar. 31, 2015

Receivables [Abstract]

Accounts Receivable

4. Accounts Receivable

Accounts receivable at March 31, 2015 and 2014 consisted of the following (in thousands):

	March 31,			March 31,
	2015			2014
Accounts receivable (billed)	$	8,946		$	6,113
Accounts receivable (unbilled)		987			1,459
Less: Allowance for doubtful accounts		(54	)		(16	)
Accounts receivable, net	$	9,879		$	7,556

As of March 31, 2015, one customer, Inox Wind Limited (“Inox”), accounted for approximately 56% of the Company’s total receivable balance. As of March 31, 2014, three customers, Inox, CGPS, and JCNE, accounted for approximately 20%, 14% and 13%, respectively, of the Company’s total receivable balance.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References+ Details

Inventory

12 Months Ended

Mar. 31, 2015

Inventory Disclosure [Abstract]

Inventory

5. Inventory

Inventory at March 31, 2015 and 2014 consisted of the following (in thousands):

	March 31,		March 31,
	2015		2014
Raw materials	$	9,411	$	3,304
Work-in-process		2,117		4,047
Finished goods		7,487		10,275
Deferred program costs		1,581		3,068
Net inventory	$	20,596	$	20,694

The Company recorded inventory write-downs of $1.4 million and $0.3 million for the years ended March 31, 2015 and 2014, respectively. These write downs were based on evaluating its inventory on hand for excess quantities and obsolescence.

Deferred program costs as of March 31, 2015 and 2014 primarily represent costs incurred on programs accounted for under contract accounting where the Company needs to complete development milestones before revenue and costs will be recognized.

- Definition

The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income.

+ References+ Details

Property, Plant and Equipment

12 Months Ended

Mar. 31, 2015

Property Plant And Equipment [Abstract]

Property, Plant and Equipment

6. Property, Plant and Equipment

The cost and accumulated depreciation of property and equipment at March 31, 2015 and 2014 are as follows (in thousands):

	March 31,			March 31,
	2015			2014
Land	$	3,643		$	3,643
Construction in progress - equipment		130			117
Buildings		34,549			34,341
Equipment and software		81,855			83,861
Furniture and fixtures		1,156			1,353
Leasehold improvements		4,132			5,211
Property, plant and equipment, gross		125,465			128,526
Less accumulated depreciation		(69,368	)		(63,952	)
Property, plant and equipment, net	$	56,097		$	64,574

Depreciation expense was $9.0 million, $9.9 million, and $12.1 million, for the years ended March 31, 2015, 2014, and 2013, respectively. (See Note 16, “Restructuring and Impairments,” for additional information regarding the effect the Company’s restructuring plan had on property, plant and equipment.)

- Definition

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

+ References+ Details

Intangible Assets

12 Months Ended

Mar. 31, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets

7. Intangible Assets

Intangible assets at March 31, 2015 and 2014 consisted of the following (in thousands):

	2015							2014
	Gross		Accumulated			Net Book		Gross		Accumulated			Net Book		Estimated
	Amount		Amortization			Value		Amount		Amortization			Value		Useful Life
Licenses	$	4,422	$	(3,328	)	$	1,094	$	4,473	$	(2,962	)	$	1,511	7
Core technology and know-how		4,858		(4,530	)		328		5,736		(5,252	)		484	5-10
Intangible assets	$	9,280	$	(7,858	)	$	1,422	$	10,209	$	(8,214	)	$	1,995

The Company recorded intangible amortization expense of $0.6 million, $0.8 million, and $0.9 million for the years ended March 31, 2015, 2014, and 2013, respectively.

Expected future amortization expense related to intangible assets is as follows (in thousands):

For the years ended March 31,	Total
2016	$	568
2017		553
2018		301
2019		-
Total	$	1,422

The geographic composition of intangible assets is as follows (in thousands):

	March 31,
	2015		2014
Intangible assets by geography:
U.S.	$	1,422	$	1,995
Europe		-		-
Total	$	1,422	$	1,995

The business segment composition of intangible assets is as follows (in thousands):

	March 31,
	2015		2014
Intangible assets by business segments:
Wind	$	-	$	-
Grid		1,422		1,995
Total	$	1,422	$	1,995

Accounts Payable and Accrued Expenses

12 Months Ended

Mar. 31, 2015

Payables And Accruals [Abstract]

Accounts Payable and Accrued Expenses

8. Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses at March 31, 2015 and 2014 consisted of the following (in thousands):

	March 31,
	2015		2014
Accounts payable	$	7,062	$	1,749
Accrued inventories in-transit		1,127		212
Accrued miscellaneous expenses		2,695		5,935
Accrued outside services		582		3,716
Accrued subcontractor program costs		-		290
Accrued compensation		5,937		6,080
Income taxes payable		278		173
Accrued adverse purchase commitments		-		402
Accrued warranty		3,934		3,207
Total	$	21,615	$	21,764

The Company generally provides a one to three year warranty on its products, commencing upon installation. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience.

Product warranty activity was as follows (in thousands):

	For the years ended
	March 31,
	2015			2014
Balance at beginning of period	$	3,207		$	2,709
Change in accruals for warranties during the period		2,839			1,717
Settlements during the period		(2,112	)		(1,219	)
Balance at end of period	$	3,934		$	3,207

Debt	12 Months Ended
Debt	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt	9. Debt Senior Convertible Note On April 4, 2012, the Company entered into the Purchase Agreement with CVI and completed a private placement of a senior convertible note, (the “Initial Note”). After fees and expenses, the net proceeds of the Initial Note were $23.2 million. The Initial Note had an initial conversion price of $48.50 per share, representing a premium of approximately 20% over AMSC’s closing price on April 3, 2012, as adjusted for the reverse stock split. The Initial Note was payable in monthly installments beginning four months from issuance and ending on October 4, 2014. Monthly payments were payable in cash or the Company’s common stock at the option of the Company, subject to certain trading volume, stock price and other conditions. CVI could elect to defer receipt of monthly installment payments at its option. Any deferred installment payments would continue to accrue interest. The Company registered 1,026,231 shares of common stock which could be used as payment for principal and interest in lieu of cash for resale under the Securities Act of 1933, as amended (the “Securities Act”) as required under a Registration Rights Agreement with CVI. The Company accounted for the Initial Note as an instrument that has the characteristics of a debt host contract containing several embedded derivative features that would require bifurcation and separate accounting as a derivative instrument pursuant to the provisions of ASC Topic 815 – Derivatives and Hedging (ASC 815). The Company elected not to use the fair value option for the aggregate amount of the Initial Note and recorded the liability at its stated value on the date of issuance with no changes in fair value reported in subsequent periods. The Company identified the following derivatives associated with the Initial Note: holder change of control redemption rights; issuer original redemption rights; sale redemption rights; and a feature to convert the Initial Note into equity at the holder’s option. The Company valued these derivatives at $3.8 million upon issuance of the Initial Note. (See Note 10, “Warrants and Derivative Liabilities,” for additional information regarding derivative liabilities.) In conjunction with the Initial Note, CVI received a warrant to purchase 309,406 additional shares of common stock exercisable at a strike price of $54.50 per share, subject to adjustment, until October 4, 2017. Due to certain adjustment provisions within the warrant, it qualified for liability accounting and had a fair value of $7.0 million upon issuance. The Company recorded the value as a debt discount and a warrant liability. (See Note 10, “Warrants and Derivative Liabilities,” for additional information regarding the warrant.) On December 20, 2012, the Company entered into an Amendment and Exchange Agreement, (the “Amendment”) with CVI, which amended the Purchase Agreement. Pursuant to the Amendment, the Company and CVI exchanged the Initial Note for the Exchanged Note. At the time of the exchange, the Exchanged Note had the same principal amount and accrued interest as the Initial Note. The Exchanged Note was convertible into the Company’s common stock and had the same scheduled monthly installment payments as the Initial Note. The Exchanged Note provided the Company with additional flexibility to make monthly installment payments in shares of the Company’s common stock. The Company retained the ability to repay the Exchanged Note in cash. The Company assessed the changes in the Exchanged Note and accounted for it as a modification of the Initial Note. Therefore, the Company determined the incremental value of the derivative instruments, as a result of the Exchanged Note, as having a reduced conversion price. As a result of the re-valuation, the Company recorded a $0.5 million increase in the value of the derivative liability and additional debt discount. At the modification date, the value of the derivative liability was $1.5 million. The total debt discount, including the embedded derivatives in the Initial Note, the incremental value of embedded derivatives in the Exchanged Note, warrant and legal and origination costs of $13.1 million was amortized into interest expense over the term of the Exchanged Note using the effective interest method. Under this method, interest expense was recognized each period until the debt instruments reached maturity. Given that the maturity of the Exchanged Note was accelerated due to prepayment, the amortization was accelerated. On October 9, 2013, the Company entered into a Second Amendment and Warrant Exchange Agreement (the “CVI Second Amendment”) with CVI. The CVI Second Amendment further amended the Purchase Agreement, as amended by the Amendment (collectively, the “Amended Purchase Agreement”), that the Company previously entered into with CVI. Pursuant to the CVI Second Amendment, the Company and/or CVI waived certain provisions of the Amended Purchase Agreement and amended certain provisions of the Exchanged Note and exchanged the warrant (the “Original Warrant”) for a new warrant (the Exchanged Warrant”) with a reduced exercise price of $26.10 per share of common stock. The Company assessed the changes to the Exchanged Note included in the CVI Second Amendment and accounted for it as a modification of the Exchanged Note. Therefore, the Company determined the incremental value of the derivative instruments, as a result of the CVI Second Amendment, specifically the Exchanged Warrant. (See Note 10 “Warrants and Derivative Liabilities” for discussion of the valuation of the Exchanged Warrant.) During the years ended March 31, 2014 and 2013, the Company recorded non-cash interest expense for amortization of the debt discount related to the convertible notes of $4.1 million and $8.2 million respectively. Provided certain equity conditions were met, the Company could elect to repay principal and interest in shares of the Company’s common stock. If the Company elected to make a payment in shares of the Company’s common stock, the number of shares issued was determined by dividing the amount of such payment by 85% of the lessor of the average volume-weighted average price (“VWAP”) of the 10 consecutive days immediately preceding the payment date or the VWAP price on the day preceding the payment date (the “Market Price”). The Company recorded the difference between the closing price of its common stock on the day preceding the payment date and the Market Price as a discount on the fair value of its shares. During the years ended March 31, 2014 and 2013, the Company recorded $2.9 million and $3.6 million, respectively, of non-cash interest expense related to installment payments made by issuing the Company’s common stock at a discount. On March 2, 2014, the Company entered into an Exchange Agreement with CVI, pursuant to which the Company exchanged the Exchanged Note for approximately 663,000 shares of common stock and extinguished the debt. As a result of this transaction, the Company recorded a loss on the extinguishment of debt of $5.2 million during the three months ended March 31, 2014. Senior Secured Term Loans On June 5, 2012, the Company entered into a Loan and Security Agreement with Hercules (the “Term Loan”), under which the Company borrowed $10.0 million. After the closing fees and expenses, the net proceeds to the Company were $9.7 million. The Term Loan bears an interest rate equal to 11% plus the percentage, if any, by which the prime rate as reported by The Wall Street Journal exceeds 3.75%. The Company made interest-only payments from July 1, 2012 through October 31, 2012, after which the Company began repaying the Term Loan in equal monthly installments ending on December 1, 2014, when the loan was repaid in full. In addition, Hercules received a warrant (the “First Warrant”) to purchase 13,927 shares of common stock, exercisable at an initial strike price of $35.90 per share, subject to adjustment, until December 5, 2017. Due to certain adjustment provisions within the warrant, it qualified for liability accounting and the fair value of $0.4 million was recorded upon issuance, which the Company recorded as a debt discount and a warrant liability. The Company paid an end of term fee of $0.5 million upon the maturity of the loan on December 1, 2014. Initially, the Company had accrued the end of term fee and recorded a corresponding amount into the debt discount. In addition, the Company incurred $0.3 million of legal and origination costs in the year ended March 31, 2013, which have been recorded as a debt discount. The total debt discount including the First Warrant, end of term fee and legal and origination costs of $1.2 million was amortized into interest expense over the term of the Term Loan using the effective interest method. Under this method, interest expense was recognized each period until the debt instrument reached maturity. During the years ended March 31, 2015 and 2014, the Company recorded non-cash interest expense for amortization of the debt discount related to the Term Loan of less than $0.1 million and $0.5 million, respectively. On November 15, 2013, the Company amended the Term Loan with Hercules and entered into a new term loan (the “New Term Loan B”), borrowing an additional $10.0 million. After closing fees and expenses, the net proceeds to the Company for the New Term Loan B were $9.8 million. The New Term Loan B bears the same interest rate as the Term Loan. The Company made interest-only payments from December 1, 2013 to May 31, 2014. If the Company achieved certain revenue targets for the six-month period ending March 31, 2014, interest only payments would continue through August 31, 2014. The Company did not meet these revenue targets. As a result, the Company is repaying the New Term Loan B in equal monthly installments ending on November 1, 2016. The principal balance of the New Term Loan B is approximately $6.7 million as of March 31, 2015. Hercules received a warrant (the “Second Warrant”) to purchase 25,641 shares of common stock, exercisable at an initial strike price of $19.50 per share, subject to adjustment, until May 15, 2019. In addition, the exercise price of the First Warrant was reduced to $19.50 per share. (See Note 10, “Warrants and Derivative Liabilities,” for a discussion on both warrants and the valuation assumptions used.) The Company will pay an end of term fee of $0.5 million upon the earlier of maturity or prepayment of the New Term Loan B. The Company has accrued the end of term fee and recorded a corresponding amount into the debt discount. The New Term Loan B includes a mandatory prepayment feature which allows Hercules the right to use any of the Company’s net proceeds from specified asset dispositions greater than $1.0 million in a calendar year to pay off any outstanding accrued interest and principal balance on the New Term Loan B. The Company determined the fair value to be de-minimis for this feature. In addition, the Company incurred $0.2 million of legal and origination costs in the year ended March 31, 2014, which have been recorded as a debt discount. The total debt discount including the Second Warrant, end of term fee and legal and origination costs of $1.0 million is being amortized into interest expense over the term of the New Term Loan B using the effective interest method. During the years ended March 31, 2015 and 2014, the Company recorded non-cash interest expense for amortization of the debt discount related to the New Term Loan B of $0.4 million and $0.2 million, respectively. On December 19, 2014, the Company entered into an amendment with Hercules (the “Hercules Second Amendment”) and entered into a new term loan (the “New Term Loan C”), borrowing an additional $1.5 million. After closing fees and expenses, the net proceeds to the Company for the New Term Loan C were $1.4 million (The Term Loan, New Term Loan B and New Term Loan C are collectively referred to as the “Term Loans”). The New Term Loan C also bears the same interest rate as the other Term Loans. The Company will make interest only payments until maturity on March 1, 2017, when the loan is scheduled to be repaid in its entirety. As a result of the Company’s equity raise on April 29, 2015, the maturity date of the loan was extended to June 1, 2017 (See Note 19, “Subsequent Events”). In conjunction with the Hercules Second Amendment, the First and Second Warrants were cancelled and replaced with the issuance of a new warrant (the “Warrant”) to purchase 58,823 shares of common stock at an exercise price of $11.10 per share, subject to adjustment. The Warrant expires on June 30, 2020. (See Note 10, “Warrants and Derivative Liabilities”, for a discussion on the Warrant and the valuation assumptions used.) The Company will pay an end of term fee of approximately $0.1 million upon earlier of maturity or prepayment of the New Term Loan C. The Company has accrued the end of term fee and recorded a corresponding amount in the debt discount. The New Term Loan C includes the same mandatory prepayment feature as the New Term Loan B. The Company determined the fair value to be de-minimus for this feature. In addition, the Company incurred approximately $0.1 million of legal and origination costs in the three months ended December 31, 2014, which have been recorded as a debt discount. The total debt discount, including the Warrant, end of term fee and legal and origination costs of $0.3 million is being amortized into interest expense over the term of the New Term Loan C using the effective interest method. During the year ended March 31, 2015 the Company recorded less than $0.1 million of non-cash interest expense related to the New Term Loan C. If the maturity of any of the Term Loans is accelerated because of prepayment, then the amortization will be accelerated. The Term Loans are secured by substantially all of the Company’s existing and future assets, including a mortgage on real property owned by the Company’s wholly-owned subsidiary, ASC Devens LLC, and located at 64 Jackson Road, Devens, Massachusetts. The Term Loans contain certain covenants that restrict the Company’s ability to, among other things, incur or assume certain debt, merge or consolidate, materially change the nature of the Company’s business, make certain investments, acquire or dispose of certain assets, make guaranties or grant liens on its assets, make certain loans, advances or investments, declare dividends or make distributions or enter into transactions with affiliates. In addition, there is a covenant that requires the Company to maintain a minimum unrestricted cash balance (the “Minimum Threshold”) in the United States. As part of the Hercules Second Amendment, this Minimum Threshold was amended to be the lower of $5.0 million or the aggregate outstanding principal balance of the Term Loans. As of March 31, 2015, the Minimum Threshold was $5.0 million. As a result of the Company’s equity offering on April 29, 2015, the Minimum Threshold will be reduced to the lesser of $2.0 million or the aggregate outstanding principal balance of the Term Loans (See Note 19, “Subsequent Events”). The events of default under the Term Loans include, but are not limited to, failure to pay amounts due, breaches of covenants, bankruptcy events, cross defaults under other material indebtedness and the occurrence of a material adverse effect and/or change in control. In the case of a continuing event of default, Hercules may, among other remedies, declare due all unpaid principal amounts outstanding and any accrued but unpaid interest and foreclose on all collateral granted to Hercules as security under the Term Loans. Although the Company believes that as of March 31, 2015, it is in, and will remain in, compliance with the covenants and restrictions under the Term Loans, there can be no assurance that the Company will continue to be in compliance. Interest expense on the Exchanged Note and Term Loans for the years ended March 31, 2015, 2014 and 2013, was $1.7 million, $9.7 million and $14.9 million, respectively, which included $0.5 million, $7.7 million and $12.4 million, respectively, of non-cash interest expense related to the amortization of the debt discount and payment of the Exchanged Note in Company common stock at a discount.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References+ Details

Warrants and Derivative Liabilities

12 Months Ended

Mar. 31, 2015

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Warrants and Derivative Liabilities

10. Warrants and Derivative Liabilities

Senior Convertible Note Warrant

On April 4, 2012, the Company entered into the Purchase Agreement with CVI. The Purchase Agreement included the Original Warrant to purchase 309,406 shares of the Company’s common stock. The warrant is exercisable at any time on or after the date that is six months after the issuance of the warrant and entitles CVI to purchase shares of the Company’s common stock for a period of five years from the initial date the warrant becomes exercisable at a price equal to $54.50 per share, subject to certain price-based and other anti-dilution adjustments. On October 9, 2013, the Company amended the Purchase Agreement with CVI (the “Amendment”). Pursuant to the Amendment, the Company exchanged the Original Warrant for the Exchanged Warrant, with a reduced exercise price of $26.10 per share of common stock. Other than the reduced exercise price, the Exchanged Warrant has the same terms and conditions as the Original Warrant. As a result of the sales of common stock under the ATM (See Note 12, “Stockholders’ Equity”, for further discussion of the ATM) and the 909,090 units, each unit consisting of one share of common stock and 0.90 of a warrant to purchase one share of common stock (adjusted to reflect our 1-for-10 reverse stock on March 24, 2015) sold to Hudson Bay Capital during the three months ended December 31, 2014, the exercise price of the Exchanged Warrant was reduced to $22.10 per share. The Exchanged Warrant may not be exercised if, after giving effect to the conversion, CVI together with its affiliates would beneficially own in excess of 4.99% of the Company’s common stock. This percentage may be raised to any other percentage not in excess of 9.99% at the option of CVI, upon at least 61-days prior notice to the Company, or lowered to any other percentage, at the option of CVI, at any time.

The Company calculated the fair value of the derivative liabilities, (see Note 3, “Fair Value Measurements”, and Note 9, “Debt” for further discussion), and warrants utilizing an integrated lattice model. The lattice model is an option pricing model that involves the construction of a binomial tree to show the different paths that the underlying asset may take over the option’s life. A lattice model can take into account expected changes in various parameters such as volatility over the life of the options, providing more accurate estimates of option prices than the Black-Scholes model.

The Company accounts for the Exchanged Warrant as a liability due to certain adjustment provisions within the warrant, which requires that it be recorded at fair value. The Exchanged Warrant is subject to revaluation at each balance sheet date and any change in fair value will be recorded as a change in fair value of derivatives and warrants until the earlier of its expiration or its exercise at which time the warrant liability will be reclassified to equity.

Following is a summary of the key assumptions used to calculate the fair value of the warrant:

	March 31,			December 31,			September 30,			June 30,
Fiscal Year 14	2015			2014			2014			2014

Risk-free interest rate		0.73	%		1.00	%		1.07	%		0.98	%
Expected annual dividend yield		—	%		—	%		—	%		—	%
Expected volatility		70.42	%		72.38	%		76.20	%		83.50	%
Term (years)	2.51			2.76			3.01			3.26
Fair value	$0.3 million			$0.5 million			$1.5 million			$2.3 million
							Post-modification			Pre-modification
	March 31,			December 31,			October 9,			October 9,			September 30,			June 30,
Fiscal Year 13	2014			2013			2013			2013			2013			2013

Risk-free interest rate		1.11	%		1.17	%		1.05	%		1.05	%		1.02	%		1.13	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%		—	%
Expected volatility		80.99	%		75.60	%		71.45	%		71.45	%		71.98	%		71.90	%
Term (years)	3.51			3.76			3.99			3.99				4.01			4.27
Fair value	$ 2.2 million			$ 2.2 million			$ 3.2 million			$ 2.2 million			$ 2.5 million			$ 3.0 million


	March 31,			December 31,			September 30,			June 30,			April 4,
Fiscal Year 12	2013			2012			2012			2012			2012

Risk-free interest rate		0.67	%		0.75	%		0.63	%		0.77	%		1.19	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%
Expected volatility		71.74	%		80.60	%		80.90	%		80.80	%		80.00	%
Term (years)		4.51			4.76			5.01			5.28			5.50
Fair value	$ 3.4 million			$ 4.4 million			$ 7.1 million			$ 8.6 million			$ 7.0 million

The Company recorded net gains, resulting from the decrease in the fair value of the Exchanged Warrant, of $1.9 million, $1.2 million and $3.6 million to change in fair value of derivatives and warrants in the years ended March 31, 2015, 2014, and 2013 respectively.

Convertible Note Derivative Liability

The Company determined certain embedded derivatives issued with the Initial Note required accounting as a liability, which requires they be accounted for as a standalone liability subject to revaluation at each balance sheet date with changes in fair value recorded as change in fair value of derivatives and warrants until the earlier of exercise or expiration.

The terms of the December 2012 Amendment with CVI provided for, among other things, the exchange of the Initial Note for the Exchanged Note and the reduction of the conversion price of the Initial Note from $48.50 per share to $31.90 per share in the Exchanged Note.

On March 2, 2014, the Company entered into an Exchange Agreement with CVI, pursuant to which the Company exchanged the Exchanged Note for approximately 663,000 shares of common stock, in full satisfaction of all amounts owed under the Exchanged Note, including any accrued interest. In addition, the Company extinguished the remaining value for the derivative liability identified with the Exchanged Note and any unamortized debt discount.

Following is a summary of the key assumptions used to value the convertible notes derivative features:

	March 31,			December 31,			September 30,			June 30,
Fiscal Year 13	2014			2013			2013			2013

Principal outstanding (000's)	$ —			$	10,411		$	10,411		$	14,389
Stock price	N/A			$	16.40		$	23.40		$	26.40
Percentage volume condition met	— %				87.20	%		80.20	%		87.50	%
Expected volatility	— %				68.63	%		66.26	%		65.80	%
Risk free rate	— %				0.12	%		0.10	%		0.21	%
Bond yield	— %				16.50	%		15.50	%		16.70	%
Recovery rate	— %				35.00	%		35.00	%		37.00	%
Redeemable	N/A			yes			yes			yes
Total time (years)	—				0.75			1.00			1.26
Dilution effect	N/A			yes			yes			yes
Fair value	$ —			$ —			$ 0.2 million			$ 0.5 million
Fair value as a percent of par	— %				0.02	%		0.70	%		3.30	%



							Post-modification			Pre-modification
	March 31,			December 31,			December 20,			December 20,			September 30,			June 30,			April 4,
Fiscal Year 12	2013			2012			2012			2012			2012			2012			2012

Principal outstanding (000's)	$	15,380		$	20,944		$	20,944		$	24,074		$	24,074		$	25,000		$	25,000
Stock price	$	26.70		$	26.20		$	29.50		$	29.50		$	41.50		$	46.80		$	39.70
Percentage volume condition met		80.50	%		94.50	%		94.90	%		28.60	%		51.00	%		75.20	%		85.90	%
Expected volatility		66.91	%		73.50	%		72.50	%		72.50	%		70.00	%		71.00	%		75.00	%
Risk free rate		0.20	%		0.23	%		0.25	%		0.25	%		0.23	%		0.33	%		0.44	%
Bond yield		16.50	%		16.50	%		16.50	%		16.50	%		15.00	%		16.00	%		15.00	%
Recovery rate		30.00	%		30.00	%		30.00	%		30.00	%		30.00	%		30.00	%		30.00	%
Redeemable	yes			yes			yes			yes			yes			yes			yes
Total time (years)		1.51			1.76			1.79			1.79			2.01			2.28			2.50
Dilution effect	yes			yes			yes			yes			yes			yes			yes
Fair value	$ 0.5 million			$ 1.0 million			$ 1.5 million			$ 0.9 million			$ 2.8 million			$ 4.5 million			$ 3.8 million
Fair value as a percent of par		3.40	%		4.90	%		7.10	%		3.90	%		11.40	%		17.90	%		15.10	%

Based on historical VWAP of the Company’s common stock as well as the historic average dollar trading volume of the Company’s common stock, the percentage volume condition is the probability that the Company will convert monthly installment payments into the Company’s common stock. The expected volatility rate was estimated based on an equal weighting of the historical volatility of the Company’s common stock and the implied volatility of the Company’s traded options. To determine the risk-free interest rate, an interpolated rate was used based on the one, two and three-year United States Treasury rates. The bond yield was estimated using comparable corporate debt and yield information. The recovery rate of the Exchanged Note was estimated by reviewing historical corporate debt that went into default. The bond is redeemable by the Company at any point after the one-year anniversary of the grant date provided certain provisions within the note. The total time is based on the actual 30-month contractual terms. It was determined that there is a dilution effect based on the Company’s ability to make payments in shares of common stock.

The Company recorded net gains, resulting from the decrease in the fair value of the derivative, of $0.5 million and $3.8 million to change in fair value of derivatives and warrants in the year ended March 31, 2014, and 2013, respectively.

Senior Secured Term Loan – First Warrant

On June 5, 2012, the Company entered into the Loan and Security Agreement with Hercules. (See Note 9, “Debt,” for additional information regarding the Loan and Security Agreement.) In conjunction with this agreement, the Company issued the First Warrant to purchase 13,927 shares of the Company’s common stock. The First Warrant was exercisable at any time after its issuance and had an expiration date of December 5, 2017, at a price equal to $35.90 per share subject to certain price-based and other anti-dilution adjustments. The exercise price was reduced to $19.50 per share in conjunction with entering into the New Term Loan B. An anti-dilution adjustment due to the sale of 909,090 units of the Company’s common stock to Hudson Bay Capital resulted in a reduction of the exercise price to $17.00 per share, on November 13, 2014. The Hercules Second Amendment resulted in the cancellation of the First Warrant on December 19, 2014.

The Company had accounted for the First Warrant as a liability due to certain provisions within the warrant, which required that it be recorded at fair value. The First Warrant was subject to revaluation at each balance sheet date and any change in fair value was recorded as a change in fair value of derivatives and warrants until the warrant was cancelled on December 19, 2014.

Following is a summary of the key assumptions used to calculate the fair value of the First Warrant:

				Pre-Exchange
	December 31,			December 19,			September 30,			June 30,
Fiscal Year 14	2014			2014			2014			2014

Risk-free interest rate		—	%		1.10	%		1.13	%		1.04	%
Expected annual dividend yield		—	%		—	%		—	%		—	%
Expected volatility		—	%		67.01	%		78.30	%		82.75	%
Term (years)	—				2.96			3.18			3.43
Fair value	—			$ 0.1 million			$ 0.1 million			$ 0.1 million

							Post-modification			Pre-modification
	March 31,			December 31,			November 15,			November 15,			September 30,			June 30,
Fiscal Year 13	2014			2013			2013			2013			2013			2013

Risk-free interest rate		1.18	%		1.24	%		1.00	%		1.00	%		1.09	%		1.20	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%		—	%
Expected volatility		80.73	%		74.79	%		72.64	%		72.64	%		72.10	%		72.30	%
Term (years)		3.68			3.93			4.05			4.05			4.18			4.43
Fair value	$ 0.1 million			$ 0.1 million			$ 0.1 million			$ 0.1 million			$ 0.2 million			$ 0.2 million



	March 31,			December 31,			September 30,			June 30,			June 5,
Fiscal Year 12	2013			2012			2012			2012			2012

Risk-free interest rate		0.70	%		0.75	%		0.64	%		0.80	%		0.77	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%
Expected volatility		72.01	%		80.14	%		81.18	%		80.32	%		79.99	%
Term (years)		4.68			4.93			5.18			5.44			5.50
Fair value	$ 0.2 million			$ 0.2 million			$ 0.4 million			$ 0.5 million			$ 0.4 million

The Company recorded net gains, resulting from the decrease in fair value of the First Warrant, of $0.1 million, $0.1 million and $0.2 million to change in fair value of derivatives and warrants during the years ended March 31, 2015, 2014, and 2013, respectively.

Senior Secured Term Loan – Second Warrant

On November 15, 2013, the Company amended the Loan and Security Agreement with Hercules and entered into the New Term Loan B. (See Note 9, “Debt,” for additional information regarding the New Term Loan B.) In conjunction with this agreement, the Company issued the Second Warrant to purchase 25,641 shares of the Company’s common stock. The Second Warrant was exercisable at any time after its issuance at a price equal to $19.50 per share subject to certain price-based and other anti-dilution adjustments and had an expiration date of May 15, 2019. An anti-dilution adjustment due to the sale of 909,090 units of the Company’s common stock to Hudson Bay Capital resulted in a reduction of the exercise price to $17.00 per share on November 13, 2014. The Hercules Second Amendment resulted in the cancellation of the Second Warrant on December 19, 2014.

The Company had accounted for the Second Warrant as a liability due to certain provisions within the warrant, which required that it be recorded at fair value. The Second Warrant was subject to revaluation at each balance sheet date and any change in fair value was recorded as a change in fair value of derivatives and warrants until the warrant was cancelled on December 19, 2014.

Following is a summary of the key assumptions used to calculate the fair value of the Second Warrant:

				Pre-Exchange
	December 31,			December 19,			September 30,			June 30,
Fiscal Year 14	2014			2014			2014			2014

Risk-free interest rate		—	%		1.65	%		1.65	%		1.57	%
Expected annual dividend yield		—	%		—	%		—	%		—	%
Expected volatility		—	%		71.82	%		78.10	%		80.00	%
Term (years)	—				4.41			4.62			4.87
Fair value	—			$0.1 million			$ 0.2 million			$ 0.3 million

							New Issuance
	March 31,			December 31,			November 15,
Fiscal Year 13	2014			2013			2013

Risk-free interest rate		1.76	%		1.89	%		1.55	%
Expected annual dividend yield		—	%		—	%		—	%
Expected volatility		79.73	%		80.37	%		76.97	%
Term (years)		5.12			5.37			5.49
Fair value	$ 0.3 million			$ 0.3 million			$ 0.3 million

The Company recorded a net gain, resulting from the decrease in fair value of the Second Warrant, of $0.3 million in the year ended March 31, 2015 and no change in the year ended March 31, 2014.

The Company prepared its estimates for the assumptions used to determine the fair value of the warrants issued in conjunction with both the Exchanged Note and Term Loans utilizing the respective terms of the warrants with similar inputs, as described above.

Senior Secured Term Loan - New Warrant

On December 19, 2014, the Company entered into the Hercules Second Amendment and entered into the New Term Loan C. (See Note 9, “Debt” for additional information regarding the New Term Loan C). In conjunction with the agreement, the Company cancelled the First and Second Warrants, and reissued a Warrant to purchase 58,823 shares of the Company’s common stock. The Warrant is exercisable at any time after its issuance at a price of $11.00 per share, subject to certain price-based and other anti-dilution adjustments, and expires on June 30, 2020.

The Company accounts for the Warrant as a liability due to certain provisions within the Warrant, which requires that it be recorded at fair value. The Warrant is subject to revaluation at each balance sheet date and any change in fair value will be recorded as a change in fair value of derivatives and warrants until the earlier of its expiration or its exercise, at which time the warrant liability will be reclassified to equity.

Following is a summary of the key assumptions used to calculate the fair value of the Warrant:

							New Issuance
	March 31,			December 31,			December 19,
Fiscal Year 14	2015			2014			2014

Risk-free interest rate		1.41	%		1.73	%		1.74	%
Expected annual dividend yield		—	%		—	%		—	%
Expected volatility		74.60	%		77.43	%		70.26	%
Term (years)		5.25			5.50			5.53
Fair value	$0.2 million			$0.2 million			$0.2 million

The Company recorded no significant change in the fair value of the Warrant in the year ended March 31, 2015.

November 2014 Warrant

On November 13, 2014, the Company completed an offering of 909,090 units of the Company’s common stock (adjusted to reflect our 1-for-10 reverse stock split effected on March 24, 2015) with Hudson Bay Capital. (See Note 12, “Stockholder’s Equity”, for further information). Each unit consisted of one share of the Company’s common stock and 0.90 of a warrant to purchase one share of common stock, or a warrant to purchase in the aggregate 818,181 shares (the “November 2014 Warrant”). The November 2014 Warrant is exercisable at any time, at a price equal to $11.00 per share and expires on November 13, 2019.

The Company accounts for the November 2014 Warrant as a liability due to certain provisions within the warrant, which requires that it be recorded at fair value. The November 2014 Warrant is subject to revaluation at each balance sheet date and any change in fair value will be recorded as a change in fair value of derivatives and warrants until the earlier of its expiration or its exercise, at which time the warrant liability will be reclassified to equity.

Following is a summary of the key assumptions used to calculate the fair value of the November 2014 Warrant:

							New Issuance
	March 31,			December 31,			November 13,
Fiscal Year 14	2015			2014			2014

Risk-free interest rate		1.28	%		1.61	%		1.64	%
Expected annual dividend yield		—	%		—	%		—	%
Expected volatility		75.96	%		78.00	%		72.86	%
Term (years)		4.62			4.87			5.00
Fair value	$2.5 million			$3.2 million			$4.3 million

The Company recorded a decrease in the fair value of the November 2014 Warrant, resulting in a gain of $1.8 million in the year ended March 31, 2015.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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+ Details

Income Taxes

12 Months Ended

Mar. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

11. Income Taxes

Income (loss) before income taxes for the years ended March 31, 2015, 2014, and 2013 are provided in the table as follows (in thousands):

	For the years ended March 31,
	2015			2014			2013
Income (loss) before income tax expense:
U.S.	$	(40,277	)	$	(91,558	)	$	(66,975	)
Foreign		(8,563	)		36,152			580
Total	$	(48,840	)	$	(55,406	)	$	(66,395	)

The components of income tax expense (benefit) attributable to continuing operations consist of the following (in thousands):

	For the years ended March 31,
	2015			2014			2013
Current
Federal	$	47		$	287		$	94
State		-			-			-
Foreign		(274	)		614			(438	)
Total current		(227	)		901			(344	)

Deferred
Federal		43			(49	)		93
State		-			-			-
Foreign		-			-			(13	)
Total deferred		43			(49	)		80

Income tax (benefit) expense	$	(184	)	$	852		$	(264	)

The reconciliation between the statutory federal income tax rate and the Company’s effective income tax rate is shown below.

	For the years ended March 31,
	2015				2014				2013
Statutory federal income tax rate		(34	)	%		(34	)	%		(34	)	%
State income taxes, net of federal benefit		2				-				(3	)
Deemed dividend		1				1				2
Foreign income tax rate differential		6				(6	)			(2	)
Stock options		1				2				(2	)
Nondeductible expenses		1				1				1
Research and development tax credit		-				-				(1	)
Deferred Warrants		(3	)			(1	)
Interest expense		-				5				7
Extinguishment of debt		-				3				-
Reversal of uncertain tax benefits		(6	)			-				-
Valuation allowance		32				30				32
Effective income tax rate		-		%		1		%		-		%

The following is a summary of the principal components of the Company’s deferred tax assets and liabilities (in thousands):

	For the years ended March 31,
	2015			2014
Deferred tax assets:
Net operating loss carryforwards	$	272,498		$	260,254
Research and development and other tax credit carryforwards		10,655			10,613
Accruals and reserves		37,153			36,214
Fixed assets and intangible assets		2,432			2,855
Other		18,514			19,594
Gross deferred tax assets		341,252			329,530
Valuation allowance		(294,860	)		(282,824	)
Total deferred tax assets		46,392			46,706

Deferred tax liabilities:
Intercompany debt		(36,298	)		(36,102	)
Other		(10,174	)		(10,641	)
Total deferred tax liabilities		(46,472	)		(46,743	)
Net deferred tax liabilities	$	(80	)	$	(37	)

The Company has provided a full valuation allowance against its net deferred income tax assets since it is more likely than not that its deferred tax assets are not currently realizable due to the net operating losses incurred by the Company since its inception and net operating losses forecasted in the future. The Company has recorded a deferred tax asset of approximately $13.2 million reflecting the benefit of deductions from the exercise of stock options. This deferred tax asset has been fully reserved since it is more likely than not that the tax benefit from the exercise of stock options will not be realized. The tax benefit will be recorded as a credit to additional paid-in capital if realized.

At March 31, 2015, the Company had aggregate net operating loss carryforwards in the U.S. for federal and state income tax purposes of approximately $760.4 million and $185.5 million, respectively, which expire in the years ending March 31, 2016 through 2035. Included in the U.S. net operating loss is $3.7 million of acquired losses from Power Quality Systems, Inc. and $52.4 million from excess tax deductions from stock options exercised in the years ending March 31, 2006 through 2015. Pursuant to the guidance on accounting for stock-based compensation, the deferred tax asset relating to excess tax benefits from these exercises was not recognized for financial statement purposes. The future benefit from these deductions will be recorded as a credit to additional paid-in capital when realized. Research and development and other tax credit carryforwards amounting to approximately $8.2 million and $3.0 million are available to offset federal and state income taxes, respectively, and will expire in the years ending March 31, 2016 through 2035.

At March 31, 2015, the Company had aggregate net operating loss carryforwards for its Austrian subsidiary, AMSC Austria GmbH, of approximately $51.5 million which can be carried forward indefinitely subject to certain annual limitations. At March 31, 2015, the Company had aggregate net operating loss carryforwards for its Chinese operation of approximately $28.6 million, which expire in the years ending March 31, 2017 and 2020. At March 31, 2015, the Company had aggregate net operating loss carryforwards from Romania of $3.0 million, which can be carried forward through March 31, 2022. Also the Company had immaterial amounts of current and net operating loss carryforwards for its other foreign operations which can be carried forward indefinitely.

Section 382 of the U.S. Internal Revenue Code of 1986, as amended (the “IRC”), provides limits on the extent to which a corporation that has undergone an ownership change (as defined) can utilize any NOL and general business tax credit carryforwards it may have. The Company is currently conducting a study as a result of the April 2015 equity offering (See Note 19, “Subsequent Events”) to determine whether Section 382 could limit the use of its carryforwards in this manner. The Company does not anticipate that any potential limitation will have a material impact on its ability to utilize its net operating loss carryforwards. If there were material ownership changes subsequent to the study it could limit the ability to utilize its net operating loss carryforwards.

The Company has not recorded a deferred tax asset for the temporary difference associated with the excess of its tax basis over the book basis in its Austrian subsidiary as the future tax benefit is not expected to reverse in the foreseeable future.

The Company has recorded a deferred tax liability as of March 31, 2015 for the undistributed earnings of its remaining foreign subsidiaries for which it can no longer assert are permanently reinvested. The total amount of undistributed earnings available to be repatriated at March 31, 2015 was $1.2 million resulting in the recording of a $0.4 million net deferred federal and state income tax liability.

Accounting for income taxes requires a two-step approach to recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if, based on the technical merits, it is more likely than not that the position will be sustained upon audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon ultimate settlement. The Company reevaluates these uncertain tax positions on a quarterly basis. This evaluation is based on factors including, but not limited to, changes in facts or circumstances, changes in tax law, effectively settled issues under audit and new audit activity. Any changes in these factors could result in the recognition of a tax benefit or an additional charge to the tax provision. The Company did not identify any uncertain tax positions at March 31, 2015. The Company did not have any gross unrecognized tax benefits at March 31, 2015 and had approximately $1.1 million at March 31, 2014. These amounts represent the amount of unrecognized tax benefits that, if recognized, would result in a reduction of the Company’s effective tax rate.

During the quarter ended September 30, 2011, the Company concluded a tax audit for the period January 1, 2006 through March 31, 2008 with its foreign subsidiary in Austria. The results of the audit concluded that previously deducted amounts for certain trademark and management fees related to corporate affairs charges would no longer be tax deductible. During the quarter ended March 31, 2015, the Company concluded a second tax audit for the period April 1, 2008 through March 31, 2011 with its foreign subsidiary in Austria. The results of this audit found no exceptions to the trademark and management fees related to corporate affairs charges in the periods under audit.

A tabular roll-forward of the Company’s uncertainties in income tax provision liability is presented below (in thousands):

Balance at March 31, 2013	$	1,061
Increase for tax positions		-
Balance at March 31, 2014	$	1,061
Reversal of uncertain tax positions		(1,061)
Balance at March 31, 2015	$	-

The Company accounts for interest and penalties related to uncertain tax positions as part of its provision for federal and state income taxes. Any unrecognized tax benefits, if recognized, would favorably affect its effective tax rate in any future period. The Company does not expect that the amounts of unrecognized benefits will change significantly within the next twelve months. Interest and penalties were recorded beginning in the year ended March 31, 2011 through March 31, 2014, but were immaterial amounts and subsequently reversed in the year ended March 31, 2015.

The Company conducts business globally and, as a result, its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. Major tax jurisdictions include the U.S., China and Austria. All U.S. income tax filings for years ending March 31, 1995 through 2015 remain open and subject to examination and all years from the year ended March 31, 2012 through 2015 remain open and subject to examination in Austria. Tax filings in China for calendar years 2008 through 2014 will remain open and subject to examination. Tax filings in Romania for the year ended March 31, 2014 through 2015 remain open and subject to examination.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References+ Details

Stockholders' Equity

12 Months Ended

Mar. 31, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stockholders’ Equity

12. Stockholders’ Equity

Stock-Based Compensation

The components of employee stock-based compensation for the years ended March 31, 2015, 2014 and 2013 were as follows (in thousands):

	For the Years Ended March 31,
	2015		2014		2013
Stock options	$	1,851	$	2,730	$	3,389
Restricted stock and stock awards		4,063		7,936		4,698
Employee stock purchase plan		22		30		51
Total stock-based compensation expense	$	5,936	$	10,696	$	8,138

The estimated fair value of the Company’s stock-based awards, less expected annual forfeitures, is amortized over the awards’ service period. The total unrecognized compensation cost for unvested outstanding stock options was $1.2 million and $2.0 million for the years ended March 31, 2015 and 2014, respectively. This expense will be recognized over a weighted-average expense period of approximately 2.7 years. The total unrecognized compensation cost for unvested outstanding restricted stock was $2.6 million and $1.8 million for the years ended March 31, 2015 and 2014, respectively. This expense will be recognized over a weighted-average expense period of approximately 1.2 years.

The following table summarizes employee stock-based compensation expense by financial statement line item for the years ended March 31, 2015, 2014 and 2013 (in thousands):

	2015		2014		2013
Cost of revenues	$	719	$	1,002	$	726
Research and development		1,728		2,751		2,456
Selling, general and administrative		3,489		6,943		4,956
Total	$	5,936	$	10,696	$	8,138

The following table summarizes the information concerning currently outstanding and exercisable employee and non-employee options:

						Weighted-
				Weighted-		Average
				Average		Remaining		Aggregate
	Options/			Exercise		Contractual		Intrinsic Value
	Shares			Price		Term		(thousands)
Outstanding at March 31, 2014		294,184		$	109.31
Granted		100,000			14.30
Exercised		-			-
Cancelled/forfeited		(13,244	)		103.51
Outstanding at March 31, 2015		380,940		$	84.57		6.6	$	-
Exercisable at March 31, 2015		210,869		$	135.95		5.0	$	-
Fully vested and expected to vest at March 31, 2015		363,021		$	87.94		6.5	$	-

The weighted-average grant-date fair value of stock option awards granted during the years ended March 31, 2015, 2014 and 2013 was $10.18 per share, $16.20 per share, and $25.60 per share, respectively. Intrinsic value represents the amount by which the market price of the common stock exceeds the exercise price of the options. Given the decline in the Company’s stock price, exercisable options as of March 31, 2015, 2014 and 2013 had no intrinsic value.

The weighted average assumptions used in the Black-Scholes valuation model for stock options granted during the years ended March 31, 2015, 2014, and 2013 are as follows:

	For the Years Ended March 31,
	2015			2014			2013
Expected volatility		85.5	%		75.1	%		72.0	%
Risk-free interest rate		1.9	%		1.7	%		0.9	%
Expected life (years)		5.8			5.9			5.9
Dividend yield	None			None			None

The expected volatility rate was estimated based on an equal weighting of the historical volatility of the Company’s common stock and the implied volatility of the Company’s traded options. The expected term was estimated based on an analysis of the Company’s historical experience of exercise, cancellation, and expiration patterns. The risk-free interest rate is based on the average of the five and seven year U.S. Treasury rates.

The following table summarizes the employee and non-employee restricted stock activity for the year ended March 31, 2015:

				Weighted		Intrinsic
				Average		Aggregate
				Grant Date		Value
	Shares			Fair Value		(thousands)
Outstanding at March 31, 2014		241,536		$	33.43
Granted		332,782			16.68
Vested		(210,942	)		29.09
Forfeited		(22,788	)		18.91
Outstanding at March 31, 2015		340,588		$	20.82	$	2,193

The total fair value of restricted stock that was granted during the years ended March 31, 2015, 2014 and 2013 was $5.6 million, $4.5 million, which includes $0.5 million for bonus and severance, and $10.6 million, which includes $1.6 million for bonus and severance, respectively. The total fair value of restricted stock that vested during the years ended March 31, 2015, 2014 and 2013 was $3.1 million, $3.7 million, which includes $0.5 million for bonus and severance, and $3.4 million, which includes $1.6 million for bonus and severance respectively.

The restricted stock granted during the years ended March 31, 2015, 2014 and 2013 includes approximately 38,021, 40,201, and 142,212 shares, respectively, of performance-based restricted stock, which would vest upon achievement of certain financial performance measurements. Included in the table above are 10,000 shares of restricted stock units outstanding.

The remaining shares granted vest upon the passage of time. For awards that vest upon the passage of time, expense is being recorded over the vesting period.

Stock-Based Compensation Plans

As of March 31, 2015, the Company had two active stock plans: the 2007 Stock Incentive Plan, as amended (the “2007 Plan”) and the Amended and Restated 2007 Director Stock Plan (the “2007 Director Plan”). The 2007 Stock Incentive Plan replaced the Company’s 2004 Stock Incentive Plan upon the approval by the Company’s stockholders on August 3, 2007. The 2007 Director Stock Plan replaced the Second Amended and Restated 1997 Director Stock Option Plan, which expired pursuant to its terms on May 2, 2007. Both the 2007 Plan and the 2007 Director Plan were approved by the Company’s stockholders on August 1, 2014.

The 2007 Plan provides for the grant of incentive stock options intended to qualify under Section 422 of the Internal Revenue Code of 1986, as amended, nonstatutory stock options, stock appreciation rights, restricted stock, restricted stock units and other stock-based awards. In the case of options, the exercise price shall be equal to at least the fair market value of the common stock, as determined by (or in a manner approved by) the Board of Directors, on the date of grant. The contractual life of options is generally 10 years. Options generally vest over a 3-5 year period while restricted stock generally vests over a 3 year period.

As of March 31, 2015, the 2007 Director Plan provided for the grant of nonstatutory stock options and stock awards to members of the Board of Directors who are not also employees of the Company (outside directors). Under the terms of the 2007 Director Plan as of March 31, 2014, each outside director was granted an option to purchase 1,000 shares of common stock upon his or her initial election to the Board of Directors with an exercise price equal to the fair market value of the Company’s common stock on the date of the grant. These options vest in equal annual installments over a two-year period. In addition, as of March 31, 2014, each outside director was granted an award of 300 shares of common stock three business days following each annual meeting of stockholders, provided that such outside director had served as a director for at least one year. Under the terms of the 2007 Director Plan effective April 1, 2014, each outside director is granted an option to purchase shares of common stock with an aggregate grant date value equal to $40,000 upon his or her initial election to the Board with an exercise price equal to the fair market value of the Company’s common stock on the date of the grant. These options vest in equal annual installments over a two-year period. In addition, effective April 1, 2014, each outside director is granted an award of shares of common stock with an aggregate grant date value equal to $40,000 three business days following the last day of each fiscal year, subject to proration for any partial fiscal year of service.

As of March 31, 2015, the 2007 Plan had 557,578 shares and the 2007 Director Plan had 64,700 shares available for future issuance.

Employee Stock Purchase Plan

The Company has an employee stock purchase plan (ESPP) which provides employees with the opportunity to purchase shares of common stock at a price equal to the market value of the common stock at the end of the offering period, less a 15% purchase discount. The Company recognized compensation expense of $0.1 million for each of the years ended March 31, 2015, 2014, and 2013, respectively, related to the ESPP. The Company issued 16,708 shares of common stock related to the ESPP during the year ended March 31, 2015. As of March 31, 2015, the ESPP had 8,168 shares available for future issuance.

ATM Arrangement

On November 15, 2013, the Company entered into an ATM arrangement, pursuant to which, the Company could, at its discretion, sell up to $30.0 million of the Company’s common stock through its sales agent, MLV & Co. LLC (“MLV”). Sales of common stock made under the ATM were made on The NASDAQ Global Market under the Company’s previously filed and currently effective Registration Statement on Form S-3 (File No. 333-191153) by means of ordinary brokers’ transactions at market prices. Under the terms of the ATM, the Company could sell shares of its common stock through MLV, on The NASDAQ Global Market or otherwise, at negotiated prices or at prices related to the prevailing market price. Under the terms of the ATM, MLV could not engage in any proprietary trading or trading as principal for MLV’s own account. MLV used its commercially reasonable efforts to sell the Company’s common stock from time to time, based upon the Company’s instructions (including any price, time or size limits or other customary parameters or conditions the Company may impose). The Company paid MLV a commission of up to 3% of the gross proceeds from the sale of shares of its common stock under the ATM. The Company has also agreed to provide MLV with customary indemnification rights.

During the years ended March 31, 2015 and 2014, the Company received net proceeds of $5.8 million and $7.5 million, including sales commissions and offering expenses, from sales of approximately 375,000 and 487,000 shares of its common stock at an average sales price of approximately $16.05 and $16.24 per share under the ATM, respectively. The ATM arrangement was terminated on November 5, 2014.

November 2014 Offering

On November 13, 2014, the Company completed an equity offering to Hudson Bay Capital, under which the Company sold 909,090 units of its common stock at $11.00 per unit (adjusted to reflect our 1-for-10 reverse stock split). Each unit consisted of one share of common stock and 0.90 of a warrant to purchase one share of common stock, or a warrant to purchase 818,181 shares of common stock. (See Note 10, “Warrants and Derivative Liabilities”, for further information regarding the warrant.). After the underwriting discount and estimated offering expenses payable by the Company, the Company received net proceeds from the offering of approximately $9.1 million. The Company allocated the net proceeds first to the fair value of the warrants as determined under a lattice model on November 13, 2014 (See Note 10, “Warrants and Derivative Liabilities,” for a discussion on both warrants and the valuation assumptions used) with the residual fair value allocated to the common stock. Costs of the offering were allocated to other (expense) income and equity based on the relative fair value of the warrants and common stock, respectively.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29-31)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

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+ Details

Commitments and Contingencies

12 Months Ended

Mar. 31, 2015

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

13. Commitments and Contingencies

Commitments

Purchase Commitments

The Company periodically enters into non-cancelable purchase contracts in order to ensure the availability of materials to support production of its products. Purchase commitments represent enforceable and legally binding agreements with suppliers to purchase goods or services. The Company periodically assesses the need to provide for impairment on these purchase contracts and record a loss on purchase commitments when required. As of March 31, 2015, the Company had paid the remaining adverse purchase commitment liability. As of March 31, 2014, the Company recorded a liability for adverse purchase commitments of $0.4 million, which was paid during the year ended March 31, 2015.

Lease Commitments

Operating leases include minimum payments under leases for the Company’s facilities and certain equipment; see Item 2, “Properties.” The Company’s primary leased facilities are located in New Berlin, Wisconsin; Suzhou and Beijing, China; Klagenfurt, Austria; and Timisoara, Romania with a combined total of approximately 272,000 square feet of space. These leases have varying expiration dates through March 2021 which can generally be terminated at the Company’s request after a six month advance notice. The Company leases other locations which focus primarily on applications engineering, sales and/or field service and do not have significant leases or physical presence.

Minimum future lease commitments at March 31, 2015 were as follows (in thousands):

For the years ended March 31,	Total
2016	$	1,211
2017		652
2018		367
2019		224
2020		160
Thereafter		154
Total	$	2,768

Rent expense under the operating leases mentioned above was as follows (in thousands):

	For the years ended
	March 31,
	2015		2014		2013
Rent expense	$	2,091	$	2,152	$	2,437

Legal Contingencies

From time to time, the Company is involved in legal and administrative proceedings and claims of various types. The Company records a liability in its consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. The Company reviews these estimates each accounting period as additional information is known and adjusts the loss provision when appropriate. If a matter is both probable to result in a liability and the amounts of loss can be reasonably estimated, the Company estimates and discloses the possible loss or range of loss. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in its consolidated financial statements.

Ghodawat, a company registered in India carrying on the business of wind power development, lodged a Request for Arbitration with the ICC Court on May 12, 2011 and named the Company’s wholly-owned Austrian subsidiary, AMSC Austria GmbH (“AMSC Austria”) as the Respondent. Under the Request for Arbitration, Ghodawat alleged that AMSC Austria breached an agreement dated March 19, 2008 pursuant to which AMSC Austria granted a license to Ghodawat to manufacture, use, sell, market, erect, commission and maintain certain wind turbines using its technical information and wind turbine design (the “License Agreement”). Under the Request for Arbitration, Ghodawat’s claims in this arbitration amounted to approximately €18 million ($24 million). AMSC Austria submitted counterclaims under the License Agreement against Ghodawat in the amount of approximately €6 million ($8 million). On August 29, 2014, the ICC Court ruled that AMSC Austria was liable for damages and awarded Ghodawat approximately €8.3 million, which included reimbursement of legal costs and associated expenses. Interest on this amount accrued at a rate of 5.33% from the date of award. The Company had recorded a loss contingency of $0.5 million based on its assessment of probable losses on this claim in a prior period. As a result of the arbitration award liability, the Company recorded a charge of $10.2 million during the three months ended September 30, 2014.

On February 4, 2015, AMSC Austria entered into a Settlement Agreement with Ghodawat, which provided for, among other things, (i) a payment by AMSC Austria to Ghodawat of €7.45 million, and (ii) upon payment by AMSC Austria to Ghodawat, the full settlement of any and all disputes and claims between the parties (including their respective parent and affiliated companies), in particular relating to or arising out of the award. The Company paid the settlement amount during the fourth quarter of fiscal 2014. As a result of the Settlement Agreement, the Company reversed a portion of the accrued arbitration liability and recorded a reversal of an excess accrual of approximately $1.2 million in the fourth quarter of fiscal 2014. The Company’s insurer, Catlin Specialty Insurance Company (“Catlin”) sought and received a ruling from the Massachusetts Superior Court that coverage does not apply to the arbitration award liability. On January 14, 2015, the Company and AMSC Austria entered into a Settlement Agreement and Release with Catlin, which provided for, among other things, (i) the Company’s and AMSC Austria’s release of all claims against Catlin relating to the arbitration award liability, and (ii) Catlin’s release of all claims against the Company and AMSC Austria relating to approximately $2.3 million reimbursed to date under the insurance policy for expenses incurred in connection with the arbitration proceedings. As a result of the settlement with Catlin, in the fourth quarter of fiscal 2014, the Company reversed an accrual of approximately $2.2 million for expenses previously reimbursed by Catlin under the policy.

Between April 6, 2011 and May 12, 2011, seven putative securities class action complaints were filed against the Company and two of its officers in the United States District Court for the District of Massachusetts (the “Court”); one complaint additionally asserted claims against the underwriters who participated in its November 12, 2010 securities offering. On June 7, 2011, the Court consolidated these actions under the caption Lenartz v. American Superconductor Corporation, et al., Docket No. 1:11-cv-10582-WGY. On August 31, 2011, Lead Plaintiff, the Plumbers and Pipefitters National Pension Fund, filed a consolidated amended complaint against the Company, its officers and directors, and the underwriters who participated in its November 12, 2010 securities offering, asserting claims under sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and Rule 10b-5 promulgated under the Exchange Act, as well as under sections 11, 12(a)(2) and 15 of the Securities Act. On November 19, 2013, the Company entered into a Stipulation and Agreement of Settlement (the “Stipulation”), which resolved the claims asserted against the Company, certain of its current and former officers and directors, and the underwriters. The terms of the Stipulation provided, among other things, a settlement payment by the Company of $10.0 million, $8.2 million of which was to be funded by the Company’s insurers and $1.8 million of which was paid through the issuance of 94,488 shares of its common stock (the “Settlement Shares”). In the event that the value of the Settlement Shares (as calculated under the Stipulation) decreased as of the effective date of the settlement, the Company was required to make a cash payment for the difference in value. The effective date of the Stipulation was June 5, 2014 (the “Effective Date”). Pursuant to the terms of the Stipulation, (i) on June 11, 2014, the Company made a cash payment of approximately $0.5 million for the decrease in value of the Settlement Shares (as calculated under the Stipulation) as of the Effective Date, and (ii) on June 18, 2014, the Company issued the Settlement Shares. The issuance of the Settlement Shares was exempt from registration pursuant to Section 3(a)(10) of the Securities Act. The aforementioned payments by the Company represented the final amounts to be paid to the plaintiffs under the Stipulation.

Between May 4, 2011 and June 17, 2011, four putative shareholder derivative complaints were filed against the Company (as a nominal defendant) and certain of its directors in the Court. On July 5, 2011, the Court consolidated three of these actions under the caption In re American Superconductor Corporation Derivative Litigation, Docket No. 1:11-cv-10784-WGY. On June 1, 2011, the plaintiff in the fourth action, Marlborough Family Revocable Trust v. Yurek, et al., moved to voluntarily dismiss its complaint and refiled its complaint in Superior Court for the Commonwealth of Massachusetts, Middlesex County. On September 7, 2011, the Marlborough action and another putative shareholder derivative complaint filed in Superior Court for the Commonwealth of Massachusetts were consolidated. That consolidated matter was captioned In re American Superconductor Corporation Shareholder Derivative Litigation, Docket No. 11-1961. On January 12, 2012, an additional shareholder derivative complaint was filed in the Court of Chancery for the State of Delaware. That matter was captioned Krasnoff v. Budhraja, et al., Docket No. 7171. On February 4, 2014, the Company entered into a Stipulation and Agreement of Settlement (the “Derivative Stipulation”) to settle In re American Superconductor Corporation Derivative Litigation, In re American Superconductor Corporation Shareholder Derivative Litigation, and Krasnoff v. Budhraja, et al., (together, the “Derivative Actions”). The Derivative Stipulation provided for, among other things, (a) a release of all claims relating to the Derivative Actions for the Company, the individual defendants, who are all current or former officers and directors of the Company, and the plaintiffs; (b) a requirement that the Company pay to plaintiffs’ counsel $475,000 for fees and expenses, which was fully funded by the Company’s insurers; and (c) certain additions to the Company’s corporate governance policies. The terms of the Derivative Stipulation were subject to approval by the Court following notice to stockholders. By order entered May 8, 2014, the Court approved the terms of the Derivative Stipulation and issued a final judgment dismissing In re American Superconductor Corporation Derivative Litigation. Pursuant to the terms of the Derivative Stipulation, the Company and the plaintiffs subsequently jointly sought and obtained dismissal of In re American Superconductor Corporation Shareholder Derivative Litigation, and Krasnoff v. Budhraja, et al. The effective date of the settlement was June 10, 2014.

On September 13, 2011, the Company commenced a series of legal actions in China against Sinovel Wind Group Co. Ltd. (“Sinovel”). The Company’s Chinese subsidiary, Suzhou AMSC Superconductor Co. Ltd., filed a claim for arbitration with the Beijing Arbitration Commission in accordance with the terms of the Company’s supply contracts with Sinovel. The case is captioned (2011) Jing Zhong An Zi No. 0963. On March 31, 2011, Sinovel refused to accept contracted shipments of 1.5 megawatt, (“MW”) and 3 MW wind turbine core electrical components and spare parts that the Company was prepared to deliver. The Company alleges that these actions constitute material breaches of its contracts because Sinovel did not give it notice that it intended to delay deliveries as required under the contracts. Moreover, the Company alleges that Sinovel has refused to pay past due amounts for prior shipments of core electrical components and spare parts. The Company is seeking compensation for past product shipments and retention (including interest) in the amount of approximately RMB 485 million ($76 million) due to Sinovel’s breaches of its contracts. The Company is also seeking specific performance of its existing contracts as well as reimbursement of all costs and reasonable expenses with respect to the arbitration. The value of the undelivered components under the existing contracts, including the deliveries refused by Sinovel in March 2011, amounts to approximately RMB 4.6 billion ($720 million).

On October 8, 2011, Sinovel filed with the Beijing Arbitration Commission an application under the caption (2011) Jing Zhong An Zi No. 0963, for a counterclaim against the Company for breach of the same contracts under which the Company filed its original arbitration claim. Sinovel claimed, among other things, that the goods supplied by the Company do not conform to the standards specified in the contracts and claimed damages in the amount of approximately RMB 370 million ($58 million). On October 17, 2011, Sinovel filed with the Beijing Arbitration Commission a request for change of counterclaim to increase its damage claim to approximately RMB 1 billion ($157 million). On December 22, 2011, Sinovel filed with the Beijing Arbitration Commission an additional request for change of counterclaim to increase its damages claim to approximately RMB 1.2 billion ($190 million). On February 27, 2012, Sinovel filed with the Beijing Arbitration Commission an application under the caption (2012) Jing Zhong An Zi No. 0157, against the Company for breach of the same contracts under which the Company filed its original arbitration claim. Sinovel claimed, among other things, that the goods supplied by the Company do not conform to the standards specified in the contracts and claimed damages in the amount of approximately RMB 105 million ($17 million). The Company believes that Sinovel’s claims are without merit and it intends to defend these actions vigorously. Since the proceedings in this matter are in relatively early stages, the Company cannot reasonably estimate possible losses or range of losses at this time.

The Company also submitted a civil action application to the Beijing No. 1 Intermediate People’s Court under the caption (2011) Yi Zhong Min Chu Zi No. 15524, against Sinovel for software copyright infringement on September 13, 2011. The application alleges Sinovel’s unauthorized use of portions of the Company’s wind turbine control software source code developed for Sinovel’s 1.5MW wind turbines and the binary code, or upper layer, of the Company’s software for the PM3000 power converters in 1.5MW wind turbines. In July 2011, a former employee of the Company’s Austrian subsidiary was arrested in Austria on charges of economic espionage and fraudulent manipulation of data. In September 2011, the former employee pled guilty to the charges, and was imprisoned. As a result of the Company’s internal investigation and a criminal investigation conducted by Austrian authorities, the Company believes that this former employee was contracted by Sinovel through an intermediary while employed by the Company and improperly obtained and transferred to Sinovel portions of its wind turbine control software source code developed for Sinovel’s 1.5MW wind turbines. Moreover, the Company believes the former employee illegally used source code to develop for Sinovel a software modification to circumvent the encryption and remove technical protection measures on the Company’s PM3000 power converters in 1.5MW wind turbines in the field. The Company is seeking a cease and desist order with respect to the unauthorized copying, installation and use of its software, monetary damages of approximately RMB 38 million ($6 million) for its economic losses and reimbursement of all costs and reasonable expenses. The Beijing No. 1 Intermediate People’s Court accepted the case, which was necessary in order for the case to proceed. In November 2011, Sinovel filed a motion to remove this case from the Beijing No. 1 Intermediate People’s Court and transfer the matter to the Beijing Arbitration Commission. On February 14, 2012, the court denied Sinovel’s motion to remove the case. On February 21, 2012, Sinovel filed an appeal of the Beijing No. 1 Intermediate People’s Court decision to the Beijing Higher People’s Court. On April 25, 2012, the Beijing Higher People’s Court issued a final Civil Ruling which supports the Beijing No.1 Intermediate People’s Court’s civil ruling and rejected Sinovel’s appeal. Sinovel filed an appeal of the Beijing Higher People’s Court’s decision with China’s Supreme People’s Court. A hearing regarding this appeal was held at the Chinese Supreme People’s Court on October 26, 2012. On November 23, 2012, China’s Supreme People’s Court issued a Civil Ruling, holding that (1) it will conduct a re-trial of Sinovel’s appeal, and (2) the lower court’s decision will be stayed pending the re-trial. China’s Supreme People’s Court conducted a re-trial of Sinovel’s appeal on May 29, 2013. On January 26, 2014, the Supreme People’s Court ruled to uphold the Beijing Higher People’s Court ruling that the dispute shall be heard by the court. On September 15, 2014, the Beijing No. 1 Intermediate People’s Court held its first substantive hearing in the Beijing case. At the hearing, the parties presented evidence, reviewed claims, and answered questions from the court. On April 24, 2015, the Company received the sentence made by the Beijing No. 1 Intermediate People’s Court that it dismissed the case for what it cited was a lack of evidence. On May 6, 2015, the Company filed an appeal of the Beijing No. 1 Intermediate People’s Court decision to dismiss the case with the Beijing Higher People’s Court.

The Company submitted a civil action application to the Beijing Higher People’s Court against Sinovel and certain of its employees for trade secret infringement on September 13, 2011 under the caption (2011) Gao Min Chu Zi No. 4193. The application alleges the defendants’ unauthorized use of portions of the Company’s wind turbine control software source code developed for Sinovel’s 1.5MW wind turbines as described above with respect to the Copyright Action. The Company is seeking monetary damages of RMB 2.9 billion ($453 million) for the trade secret infringement as well as reimbursement of all costs and reasonable expenses. The Beijing Higher People’s Court accepted the case, which was necessary in order for the case to proceed. On December 22, 2011, the Beijing Higher People’s Court transferred this case to the Beijing No. 1 Intermediate People’s Court under the caption (2011) Gao Min Chu Zi No. 4193. On June 7, 2012, the Company received an Acceptance Notice from the Beijing No.1 Intermediate People’s Court under the caption (2012) Yi Zhong Min Chu Zi No.6833. In August 2012, Sinovel filed a motion to remove this case from the Beijing No. 1 Intermediate People’s Court and transfer the matter to the Beijing Arbitration Commission. On February 24, 2014, the Beijing No. 1 Intermediate People’s Court denied Sinovel’s motion to remove and transfer the case. On March 13, 2014, Sinovel filed an appeal of the Beijing No. 1 Intermediate People’s Court decision to the Beijing Higher People’s Court. On August 7, 2014, the Beijing Higher People’s Court upheld the Beijing No.1 Intermediate Court’s decision and rejected Sinovel’s appeal regarding the jurisdiction opposition. The Beijing No. 1 Intermediate Court held its first substantive hearing on May 11, 2015.

On September 16, 2011, the Company filed a civil copyright infringement complaint in the Hainan Province No. 1 Intermediate People’s Court against Dalian Guotong Electric Co. Ltd. (“Guotong”), a supplier of power converter products to Sinovel, and Huaneng Hainan Power, Inc. (“Huaneng”), a wind farm operator that has purchased Sinovel wind turbines containing Guotong power converter products. The case is captioned (2011) Hainan Yi Zhong Min Chu Zi No. 62. The application alleges that the Company’s PM1000 converters in certain Sinovel wind turbines have been replaced by converters produced by Guotong. Because the Guotong converters are being used in wind turbines containing the Company’s wind turbine control software, the Company believes that its copyrighted software is being infringed. The Company is seeking a cease and desist order with respect to the unauthorized use of its software, monetary damages of RMB 1.2 million ($0.2 million) for its economic losses (with respect to Guotong only) and reimbursement of all costs and reasonable expenses. The court has accepted the case, which was necessary in order for the case to proceed. In addition, upon the request of the defendant Huaneng, Sinovel has been added by the court to this case as a defendant and Huaneng has been released from this case. In December 2011, Sinovel filed a jurisdiction opposition motion requesting dismissal by the Hainan Province No. 1 Intermediate People’s Court, saying the case should be governed by the Beijing Arbitration Commission. On February 3, 2012, the Company received the Civil Ruling from the court, which granted Sinovel’s motion, and dismissed the entire case. The Company appealed the court’s ruling to the Hainan Higher Court, which on April 5, 2012 upheld the decision of the Hainan Province No. 1 Intermediate People’s Court. On April 9, 2012, the Company filed an appeal of the Hainan Higher Court’s decision with China’s Supreme People’s Court. China’s Supreme People’s Court accepted the appeal on May 23, 2012. The case is captioned, (2012) Min Shen Zi No. 630. On December 20, 2012, China’s Supreme People’s Court issued a Civil ruling, holding that (1) it will conduct a re-trial of the Company’s appeal and (2) the lower court’s decision will be stayed pending the re-trial. China’s Supreme People’s Court conducted a re-trial of Sinovel’s appeal on May 29, 2013. On January 26, 2014, the Supreme People’s Court revoked Hainan No. 1 Intermediate People’s Court and Hainan Higher People’s Court rulings and ruled that the case shall be heard by the Hainan No. 1 Intermediate People’s Court. The Hainan No. 1 Intermediate People’s Court accepted the case under the caption (2014) Hainan Yi Zhong Min San Chu Zi No. 1. On October 21, 2014, the Hainan No. 1 Intermediate People’s Court changed the caption of this case to (2014) Hainan Yi Zhong Zhi Min Chu Zi No. 2. On November 18, 2014, the Hainan No. 1 Intermediate People’s Court held its first substantive hearing in the Hainan case. At the hearing, the parties presented evidence, reviewed claims, and answered questions from the court. The Company is awaiting a decision from the Hainan No. 1 Intermediate People’s Court.

Other

The Company enters into long-term construction contracts with customers that require the Company to obtain performance bonds. The Company is required to deposit an amount equivalent to some or all the face amount of the performance bonds into an escrow account until the termination of the bond. When the performance conditions are met, amounts deposited as collateral for the performance bonds are returned to the Company. In addition, the Company has various contractual arrangements in which minimum quantities of goods or services have been committed to be purchased on an annual basis.

As of March 31, 2015 the Company had $2.8 million of restricted cash included in current assets and $1.2 million of restricted cash included in long-term assets. These amounts included in restricted cash primarily represent deposits to secure letters of credit for various supply contracts. These deposits are held in interest bearing accounts.

- Definition

The entire disclosure for commitments and contingencies.

+ References+ Details

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Mar. 31, 2015
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	14. Employee Benefit Plans The Company has implemented a defined contribution plan (the “Plan”) under Section 401(k) of the Internal Revenue Code. Any contributions made by the Company to the Plan are discretionary. The Company has a stock match program under which the Company matched, in the form of Company common stock, 50% of the first 6% of eligible contributions. The Company recorded expense of $0.4 million, $0.4 million, and $0.5 million, for the years ended March 31, 2015, 2014, and 2013, respectively, and recorded corresponding charges to additional paid-in capital related to this program.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References+ Details

Minority Investments

12 Months Ended

Mar. 31, 2015

Equity Method Investments And Joint Ventures [Abstract]

Minority Investments

15. Minority Investments

Investment in Tres Amigas LLC

The Company made an investment in Tres Amigas, focused on providing the first common interconnection of America’s three power grids to help the country achieve its renewable energy goals and facilitate the smooth, reliable and efficient transfer of green power from region to region. The Company’s original investment in Tres Amigas was $5.4 million. As of March 31, 2015, the Company holds a 26% ownership interest in Tres Amigas.

The Company has determined that Tres Amigas is a variable interest entity (“VIE”) and that the Company is not the primary beneficiary of the VIE. Therefore, the Company has not consolidated Tres Amigas as of March 31, 2015. The investment is carried at acquisition cost, plus the Company’s equity in undistributed earnings or losses. The Company’s maximum exposure to loss is limited to the Company’s recorded investment in this VIE. The Company’s investment in Tres Amigas is included in other assets on the consolidated balance sheet and the equity in undistributed losses of Tres Amigas is included in other expense, net, on the consolidated statements of operations.

The net investment activity for the year ended March 31, 2015 is as follows (in thousands):

Balance at April 1, 2014	$	1,845
Minority interest in net losses		(743	)
Balance at March 31, 2015	$	1,102

Investment in Blade Dynamics Ltd.

The Company has acquired (through its Austrian subsidiary), a minority ownership position in Blade Dynamics, a designer and manufacturer of advanced wind turbine blades based on proprietary materials and structural technologies. The Company’s original investment was for $8.0 million in cash. As of March 31, 2015, the Company holds a 12% ownership interest in Blade Dynamics.

The investment is carried at the acquisition cost, plus the Company’s equity in undistributed earnings or losses, through December 1, 2012, the date which the company no longer reported undistributed earnings or losses. The Company’s investment in Blade Dynamics is included in other assets on the consolidated balance sheet and the equity in undistributed losses of Blade Dynamics is included in other expense, net, on the consolidated statements of operations.

During the year ended March 31, 2014, the Company determined that as a result of its efforts to sell its investment in Blade Dynamics, certain indicators of impairment existed which required the Company to perform further analysis. As a result of this analysis, the Company recorded an impairment charge for approximately $1.3 million.

During the year ended March 31, 2015, the Company determined that as a result of dilutive financing which resulted in the Company losing certain of its shareholder rights, as well as certain operational issues and adverse changes to the potential sale scenarios previously considered, its investment in Blade Dynamics was no longer recoverable and therefore recorded an impairment charge of $3.5 million.

The net investment activity for the year ended March 31, 2015 is as follows (in thousands):

Balance at April 1, 2014	$	3,690
Net foreign exchange rate impact		(226	)
Impairment		(3,464	)
Balance at March 31, 2015	$	-

- Definition

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

+ References+ Details

Restructuring

12 Months Ended

Mar. 31, 2015

Restructuring And Related Activities [Abstract]

Restructuring

16. Restructuring

The Company accounts for charges resulting from operational restructuring actions in accordance with ASC Topic 420, Exit or Disposal Cost Obligations (“ASC 420”) and ASC Topic 712, Compensation—Nonretirement Postemployment Benefits (“ASC 712”). In accounting for these obligations, the Company is required to make assumptions related to the amounts of employee severance, benefits, and related costs and the time period over which leased facilities will remain vacant, sublease terms, sublease rates and discount rates. Estimates and assumptions are based on the best information available at the time the obligation arises. These estimates are reviewed and revised as facts and circumstances dictate; changes in these estimates could have a material effect on the amount accrued on the consolidated balance sheet.

During the years ended March 31, 2015, 2014 and 2013, the Company undertook restructuring activities, approved by the Board of Directors, in order to reorganize its global operations, streamline various functions of the business, and reduce its global workforce to better reflect the demand for its products. During the year ended March 31, 2014, the Company undertook a plan to consolidate its Grid manufacturing activities in its Devens, Massachusetts facility and close its facility in Middleton, Wisconsin which was completed during the year ended March 31, 2015. In addition, the Company established a new Wind manufacturing facility in Romania and as a result reduced the headcount in its operation in China to a level necessary to support demand from its Chinese customers. The Company also undertook a workforce reduction in July 2013, reducing its workforce by approximately 7%, impacting primarily selling, engineering and general and administrative functions. During the year ended March 31, 2013, the Company consolidated certain of its business operations to reduce overall facility costs. The Company recorded restructuring charges for severance and other costs of approximately $1.9 million, $1.7 million, and $2.5 million during the years ended March 31, 2015, 2014, and 2013 respectively. The restructuring charge for the fiscal year ended March 31, 2015 primarily represents severance, relocation and lease termination costs associated with closure of the Company’s Middleton, WI facility. From April 1, 2011 through March 31, 2015, the Company’s various restructuring activities resulted in a substantial reduction of its global workforce. Remaining unpaid amounts under these restructuring activities are expected to be paid by August 31, 2015.

The following table presents restructuring charges and cash payments (in thousands):

	Severance pay			Facility exit and
	and benefits			Relocation costs			Total
Accrued restructuring balance at April 1, 2013	$	145		$	54		$	199
Charges to operations		1,710			23			1,733
Cash payments		(836	)		(37	)		(873	)
Non-cash/miscellaneous reductions		(175	)		(39	)		(215	)
Accrued restructuring balance at March 31, 2014	$	844		$	-		$	844
Charges to operations		618			1,284			1,902
Cash payments		(1,282	)		(1,284	)		(2,566	)
Accrued restructuring balance at March 31, 2015	$	180		$	-		$	180

All restructuring charges discussed above are included within restructuring and impairments in the Company’s consolidated statements of operations. The Company includes accrued restructuring within accounts payable and accrued expenses in the consolidated balance sheets.

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References+ Details

Business Segment and Geographic Information

12 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Business Segment and Geographic Information

17. Business Segment and Geographic Information

The Company reports its financial results in two reportable business segments: Wind and Grid.

Through the Company’s Windtec Solutions, the Wind business segment enables manufacturers to field wind turbines with exceptional power output, reliability and affordability. The Company supplies advanced power electronics and control systems, licenses its highly engineered wind turbine designs, and provides extensive customer support services to wind turbine manufacturers. The Company’s design portfolio includes a broad range of drive trains and power ratings of 2 MWs and higher. The Company provides a broad range of power electronics and software-based control systems that are highly integrated and designed for optimized performance, efficiency, and grid compatibility.

Through the Company’s Gridtec Solutions, the Grid business segment enables electric utilities and renewable energy project developers to connect, transmit and distribute power with exceptional efficiency, reliability and affordability. The sales process is enabled by transmission planning services that allow it to identify power grid congestion, poor power quality and other risks, which helps the Company determine how its solutions can improve network performance. These services often lead to sales of grid interconnection solutions for wind farms and solar power plants, power quality systems, and transmission and distribution cable systems. The Company also sells ship protection products to the U.S. Navy through its Grid business segment.

The operating results for the two business segments are as follows (in thousands):

	For the Years Ended March 31,
	2015		2014		2013
Revenues:
Wind	$	51,307	$	55,608	$	44,231
Grid		19,223		28,509		43,188
Total	$	70,530	$	84,117	$	87,419

	For the Years Ended March 31,
	2015			2014			2013
Operating loss:
Wind	$	(14,321	)	$	(5,213	)	$	(16,098	)
Grid		(26,890	)		(22,523	)		(23,815	)
Unallocated corporate expenses		(11,306	)		(13,693	)		(17,828	)
Total	$	(52,517	)	$	(41,429	)	$	(57,741	)

Total business segments assets are as follows (in thousands):

	March 31,		March 31,
	2015		2014
Wind	$	41,947	$	36,701
Grid		42,482		54,342
Corporate assets		49,396		77,466
Total	$	133,825	$	168,509

The accounting policies of the business segments are the same as those for the consolidated Company. The Company’s business segments have been determined in accordance with the Company’s internal management structure, which is organized based on operating activities. The Company evaluates performance based upon several factors, of which the primary financial measures are segment revenues and segment operating (loss) income. The disaggregated financial results of the segments reflect allocation of certain functional expense categories consistent with the basis and manner in which Company management internally disaggregates financial information for the purpose of assisting in making internal operating decisions. In addition, certain corporate expenses which the Company does not believe are specifically attributable or allocable to either of the two business segments have been excluded from the segment operating income.

Unallocated corporate expenses primarily consist of stock-based compensation expense of $5.9 million, $10.7 million, and $8.1 million for the years ended March 31, 2015, 2014 and 2013, respectively, and restructuring and impairment charges of $5.4 million, $3.0 million, and $7.9 million for the years ended March 31, 2015, 2014 and 2013, respectively. For the year ended March 31, 2013, unallocated corporate expenses also included a loss contingency of $1.8 million.

Geographic information about revenue, based on shipments to customers by region, is as follows (in thousands):

	For the Years Ended March 31,
	2015		2014		2013
U.S.	$	9,820	$	11,013	$	13,197
Canada		2,690		3,312		1,663
Europe		2,905		7,453		14,709
China		10,410		24,748		17,906
Korea		3,506		6,429		10,945
India		39,314		26,384		17,062
Australia		1,885		4,779		11,937
Total	$	70,530	$	84,117	$	87,419

In the year ended March 31, 2015, 2014 and 2013, 86%, 87%, and 85% of the Company’s revenues, respectively, were recognized from sales outside the United States. The Company maintains operations in Austria, China and the United States and sales and service support centers around the world.

In the year ended March 31, 2015, Inox, accounted for approximately 56%, of the Company’s total revenues. In the year ended March 31, 2014, Inox and Beijing JINGCHENG New Energy (“JCNE”) accounted for approximately 31% and 18%, respectively, of the Company’s total revenues. In the year ended March 31, 2013, Inox and JCNE accounted for approximately 19% and 13%, respectively, of the Company’s total revenues.

Geographic information about property, plant and equipment associated with particular regions is as follows (in thousands):

	March 31,
	2015		2014
North America	$	54,673	$	62,426
Europe		854		1,232
Asia Pacific		570		916
Total	$	56,097	$	64,574

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

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-Name Accounting Standards Codification

-Topic 280

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+ Details

Quarterly Financial Data

12 Months Ended

Mar. 31, 2015

Quarterly Financial Data [Abstract]

Quarterly Financial Data

18. Quarterly Financial Data (Unaudited)

(In thousands, except per share amount)	For the year ended March 31, 2015:
Three Months Ended	June 30,			September 30,			December 31,			March 31,
	2014			2014			2014			2015
Total revenue	$	11,696		$	12,455		$	21,250		$	25,129
Operating loss		(12,667	)		(26,400	)		(7,735	)		(5,715	)
Net loss		(13,517	)		(25,423	)		(6,353	)		(3,363	)
Net loss per common share—basic		(1.74	)		(3.12	)		(0.72	)		(0.36	)
Net loss per common share—diluted		(1.74	)		(3.12	)		(0.72	)		(0.36	)

	For the year ended March 31, 2014:
Three Months Ended	June 30,			September 30,			December 31,			March 31,
	2013			2013			2013			2014
Total revenue	$	23,086		$	24,181		$	20,563		$	16,287
Operating loss		(8,850	)		(11,028	)		(6,675	)		(14,876	)
Net loss		(10,513	)		(14,623	)		(8,417	)		(22,705	)
Net loss per common share—basic		(1.80	)		(2.39	)		(1.35	)		(3.30	)
Net loss per common share—diluted		(1.80	)		(2.39	)		(1.35	)		(3.30	)

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References+ Details

Subsequent Events	12 Months Ended
Subsequent Events	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	19. Subsequent Events On April 24, 2015, the Company entered into an underwriting agreement with Cowen and Company, LLC, as representative of the several underwriters named therein, relating to the issuance and sale (the "Offering") of 4,000,000 shares of the Company's common stock at a public offering price of $6.00 per share. The net proceeds to the Company from the Offering were approximately $22.3 million, after deducting underwriting discounts and commissions and estimated offering expenses payable by the Company. The Offering closed on April 29, 2015. The Offering was made pursuant to the Company's shelf registration statement on Form S-3 (Registration Statement No. 333-198851) previously filed with and declared effective by the Securities and Exchange Commission (the "SEC") and a prospectus supplement and accompanying prospectus filed with the SEC

Recent Accounting Pronouncements	12 Months Ended
Recent Accounting Pronouncements	Mar. 31, 2015
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	20. Recent Accounting Pronouncements In May 2014, the FASB and the International Accounting Standards Board (IASB) issued ASU 2014-09, ASU Revenue from Contracts with Customers (Topic 606), The guidance substantially converges final standards on revenue recognition between the FASB and IASB providing a framework on addressing revenue recognition issues and, upon its effective date, replaces almost all existing revenue recognition guidance, including industry-specific guidance, in current U.S. generally accepted accounting principles. The ASU is effective for annual reporting periods beginning after December 15, 2016. The FASB is currently considering a proposed one year extension of the effective date to December 15, 2017. The Company is currently evaluating the impact of adopting ASU 2014-09 to determine the impact, if any, it may have on its current practices. In July 2014, the FASB issued ASU 2014-12, Compensation – Stock Compensation (Topic 718): Accounting for Share Based Payments When the Terms of an Award Provide that a Performance Target could be Achieved after the Requisite Service Period. To account for such awards, a reporting entity should apply existing guidance in FASB Accounting Standards Codification Topic 718, Compensation – Stock Compensation, as it relates to awards with performance conditions that affect vesting. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. This ASU is effective for annual reporting periods and interim periods, within those annual periods beginning after December 15, 2015. The Company is currently evaluating the impact of adopting ASU 2014-12 to determine the impact, if any, it may have on its current practices. In August 2014, the FASB issued ASU 2014-13, Consolidation (Topic 810): Measuring the Financial Assets and Financial Liabilities of a Consolidated Collateralized Financing Entity. The new standard applies to reporting entities that are required to consolidate a collaterized financing entity under the variable interest entities subtopic 810-10. This ASU is effective for annual reporting periods ending after December 15, 2016, and interim periods within annual periods beginning after December 15, 2016. The Company is currently evaluating the impact of adopting ASU 2014-13 to determine the impact, but currently does not believe there will be an impact on its consolidated results of operations, financial condition, or cash flow. In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements – Going Concern (Subtopic 205-40): Disclosure of Uncertainties About an Entity’s Ability to Continue as a Going Concern. The new standard explicitly requires the assessment at interim and annual periods, and provides management with its own disclosure guidance. This ASU is effective for annual reporting periods and interim periods, within those annual periods ending after December 15, 2016. The Company is currently evaluating the impact of ASU 2014-15, if any, may have on its current practices. In January 2015, the FASB issued ASU 2015-01 Income Statement—Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items. The amendments in ASU 2015-01 eliminate from U.S. GAAP the concept of extraordinary items. Subtopic 225-20, Income Statement – Extraordinary and Unusual Items, required that an entity separately classify, present, and disclose extraordinary events and transactions. This ASU is effective for annual reporting periods and interim periods, within those annual periods beginning after December 15, 2015. The Company is currently evaluating the impact of adopting ASU 2015-01, but currently does not believe there will be an impact on its consolidated results of operations, financial condition, or cash flow. In February 2015 the FASB issued ASU 2015-02 Consolidation (Topic 810): Amendments to the Consolidation Analysis. The amendments in ASU 2015-02 updated the process that a reporting entity must follow to determine whether it should consolidate certain types of legal entities. This ASU is effective for annual reporting periods beginning after December 15, 2016, and for interim periods within fiscal years beginning after December 15, 2017. The Company is currently evaluating the impact of adopting ASU 2015-02 to determine the impact, but currently does not believe there will be an impact on its consolidated results of operations, financial condition, or cash flow. In April 2015 the FASB issued ASU 2015-03 Interest—Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in ASU 2015-03 require an entity to present debt issuance costs on the balance sheet as a direct deduction from the related debt liability as opposed to an asset. Amortization of the costs will continue to be reported as interest expense. This ASU is effective for annual reporting periods beginning after December 15, 2015, and interim periods within those fiscal years. The Company is currently evaluating the impact of adopting ASU 2015-03 to determine the impact, but currently does not believe there will be an impact on its consolidated results of operations, financial condition, or cash flow.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 01

-Paragraph b

-Subparagraph 6

-Article 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 270

-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305

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-URI http://asc.fasb.org/extlink&oid=6510796

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-Name Accounting Standards Codification

-Glossary Indirect Effects of a Change in Accounting Principle

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-Name Accounting Standards Codification

-Glossary Accounting Change

-URI http://asc.fasb.org/extlink&oid=6503790

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-Glossary Change in Accounting Principle

-URI http://asc.fasb.org/extlink&oid=6507316

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-Name Accounting Standards Codification

-Topic 270

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.10-01.(b)(6))

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-Name Accounting Standards Codification

-Glossary Retrospective Application

-URI http://asc.fasb.org/extlink&oid=6523989

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-Topic 250

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-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22583-107794

+ Details

Valuation and Qualifying Accounts

12 Months Ended

Mar. 31, 2015

Valuation And Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

American Superconductor Corporation

Schedule II — Valuation and Qualifying Accounts

(In thousands)

	Balance,							Recoveries		Balance,
	Beginning of							and Other		End of
	Year		Additions		Write-offs			Adjustments		Year

Allowance for doubtful accounts receivable:
Fiscal year ended March 31, 2015	$	16		54		(16	)		-	$	54
Fiscal year ended March 31, 2014	$	-		16		-			-	$	16
Fiscal year ended March 31, 2013	$	52		-		(52	)		-	$	-

	Balance,							Recoveries		Balance,
	Beginning of							and Other		End of
	Year		Additions		Write-offs			Adjustments		Year

Deferred tax asset valuation allowance:
Fiscal year ended March 31, 2015	$	282,824		15,189		(3,153	)	-		$	294,860
Fiscal year ended March 31, 2014	$	261,961		26,649		(5,786	)	-		$	282,824
Fiscal year ended March 31, 2013	$	252,302		21,333		(11,674	)	-		$	261,961

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Basis of Consolidation

Property, Plant and Equipment

Asset Classification		Estimated Useful Life in Years
Building		40
Process upgrades to the building		10-40
Machinery and equipment		3-10
Furniture and fixtures		3-5
Leasehold improvements		Shorter of the estimated useful life or the remaining lease term

Valuation of Long-Lived Assets

Equity Method Investments

Revenue Recognition

The Company has elected to record taxes collected from customers on a net basis and does not include tax amounts in revenue or costs of revenue.

Product Warranty

Research and Development Costs

Research and development costs are expensed as incurred.

Income Taxes

Stock-Based Compensation

The Company accounts for stock-based payment transactions using a fair value-based method and recognizes the related expense in the results of operations.

Computation of Net Loss Per Common Share

Computation of Net Loss per Common Share

	Year ended March 31,
	2015			2014			2013

Numerator:
Net loss	$	(48,656	)	$	(56,258	)	$	(66,131	)
Denominator:
Weighted-average shares of common stock outstanding		8,559			6,411			5,354
Weighted-average shares subject to repurchase		(82	)		(149	)		(47	)
Shares used in per-share calculation ― basic		8,477			6,262			5,307
Shares used in per-share calculation ― diluted		8,477			6,262			5,307
Net loss per share ― basic	$	(5.74	)	$	(8.98	)	$	(12.46	)
Net loss per share ― diluted	$	(5.74	)	$	(8.98	)	$	(12.46	)

Foreign Currency Translation

Risk and Uncertainties

Risks and Uncertainties

Contingencies

Debt

Disclosure of Fair Value of Financial Instruments

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Estimated Useful Life of Property, Plant and Equipment

Asset Classification		Estimated Useful Life in Years
Building		40
Process upgrades to the building		10-40
Machinery and equipment		3-10
Furniture and fixtures		3-5
Leasehold improvements		Shorter of the estimated useful life or the remaining lease term

Reconciliation of Numerators and Denominators of EPS Calculation

The following table reconciles the numerators and denominators of the EPS calculation for the years ended March 31, 2015, 2014, and 2013 (in thousands except per share amounts):

	Year ended March 31,
	2015			2014			2013

Numerator:
Net loss	$	(48,656	)	$	(56,258	)	$	(66,131	)
Denominator:
Weighted-average shares of common stock outstanding		8,559			6,411			5,354
Weighted-average shares subject to repurchase		(82	)		(149	)		(47	)
Shares used in per-share calculation ― basic		8,477			6,262			5,307
Shares used in per-share calculation ― diluted		8,477			6,262			5,307
Net loss per share ― basic	$	(5.74	)	$	(8.98	)	$	(12.46	)
Net loss per share ― diluted	$	(5.74	)	$	(8.98	)	$	(12.46	)

Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Carried at Fair Value

The following table provides the assets and liabilities carried at fair value, measured as of March 31, 2015 and 2014 (in thousands):

	Total		Quoted Prices in		Significant Other		Significant
	Carrying		Active Markets		Observable Inputs		Unobservable Inputs
	Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2015:
Assets:
Cash equivalents	$	12,519	$	12,519	$	-	$	-
Derivative liabilities:
Warrants	$	2,999	$	-	$	-	$	2,999

	Total		Quoted Prices in		Significant Other		Significant
	Carrying		Active Markets		Observable Inputs		Unobservable Inputs
	Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2014:
Assets:
Cash equivalents	$	17,675	$	17,675	$	-	$	-
Derivative liabilities:
Warrants	$	2,601	$	-	$	-	$	2,601

Schedule of Liabilities Measured at Fair Value

The table below reflects the activity for the Company’s major classes of liabilities measured at fair value (in thousands):


				Warrants
April 1, 2014				$	2,601
Warrant issuance with equity offering					4,255
Warrant issuance with senior secured term loan					106
Mark to market adjustment					(3,963	)
Balance at March 31, 2015				$	2,999

	Derivative
	Liability			Warrants
April 1, 2013	$	529		$	3,633
Warrant issuance with senior secured term loan		-			315
Mark to market adjustment		(525	)		(1,347	)
Extinguishment of derivative liability		(4	)		-
Balance at March 31, 2014	$	-		$	2,601

Schedule of Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

	Total		Quoted Prices in	Significant Other	Significant
	Carrying		Active Markets	Observable Inputs	Unobservable Inputs
	Value		(Level 1)	(Level 2)	(Level 3)
March 31, 2014:
Assets:
Investment in unconsolidated entity – Blade Dynamics	$	3,690	$	$	$	3,690

- Definition

Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

+ References+ Details

Accounts Receivable (Tables)

12 Months Ended

Mar. 31, 2015

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable at March 31, 2015 and 2014 consisted of the following (in thousands):

	March 31,			March 31,
	2015			2014
Accounts receivable (billed)	$	8,946		$	6,113
Accounts receivable (unbilled)		987			1,459
Less: Allowance for doubtful accounts		(54	)		(16	)
Accounts receivable, net	$	9,879		$	7,556

Inventory (Tables)

12 Months Ended

Mar. 31, 2015

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventory at March 31, 2015 and 2014 consisted of the following (in thousands):

	March 31,		March 31,
	2015		2014
Raw materials	$	9,411	$	3,304
Work-in-process		2,117		4,047
Finished goods		7,487		10,275
Deferred program costs		1,581		3,068
Net inventory	$	20,596	$	20,694

Property, Plant and Equipment (Tables)

12 Months Ended

Mar. 31, 2015

Property Plant And Equipment [Abstract]

Schedule of Cost and Accumulated Depreciation of Property and Equipment

The cost and accumulated depreciation of property and equipment at March 31, 2015 and 2014 are as follows (in thousands):

	March 31,			March 31,
	2015			2014
Land	$	3,643		$	3,643
Construction in progress - equipment		130			117
Buildings		34,549			34,341
Equipment and software		81,855			83,861
Furniture and fixtures		1,156			1,353
Leasehold improvements		4,132			5,211
Property, plant and equipment, gross		125,465			128,526
Less accumulated depreciation		(69,368	)		(63,952	)
Property, plant and equipment, net	$	56,097		$	64,574

Intangible Assets (Tables)

12 Months Ended

Mar. 31, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

Intangible assets at March 31, 2015 and 2014 consisted of the following (in thousands):

	2015							2014
	Gross		Accumulated			Net Book		Gross		Accumulated			Net Book		Estimated
	Amount		Amortization			Value		Amount		Amortization			Value		Useful Life
Licenses	$	4,422	$	(3,328	)	$	1,094	$	4,473	$	(2,962	)	$	1,511	7
Core technology and know-how		4,858		(4,530	)		328		5,736		(5,252	)		484	5-10
Intangible assets	$	9,280	$	(7,858	)	$	1,422	$	10,209	$	(8,214	)	$	1,995

Schedule of Expected Future Amortization Expense

Expected future amortization expense related to intangible assets is as follows (in thousands):

For the years ended March 31,	Total
2016	$	568
2017		553
2018		301
2019		-
Total	$	1,422

Schedule of Geographic Composition of Goodwill and Intangible Assets

The geographic composition of intangible assets is as follows (in thousands):

	March 31,
	2015		2014
Intangible assets by geography:
U.S.	$	1,422	$	1,995
Europe		-		-
Total	$	1,422	$	1,995

Schedule of Business Segment Composition of Intangible Assets

The business segment composition of intangible assets is as follows (in thousands):

	March 31,
	2015		2014
Intangible assets by business segments:
Wind	$	-	$	-
Grid		1,422		1,995
Total	$	1,422	$	1,995

Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Mar. 31, 2015

Payables And Accruals [Abstract]

Schedule of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses at March 31, 2015 and 2014 consisted of the following (in thousands):

	March 31,
	2015		2014
Accounts payable	$	7,062	$	1,749
Accrued inventories in-transit		1,127		212
Accrued miscellaneous expenses		2,695		5,935
Accrued outside services		582		3,716
Accrued subcontractor program costs		-		290
Accrued compensation		5,937		6,080
Income taxes payable		278		173
Accrued adverse purchase commitments		-		402
Accrued warranty		3,934		3,207
Total	$	21,615	$	21,764

Schedule of Product Warranty Activity

Product warranty activity was as follows (in thousands):

	For the years ended
	March 31,
	2015			2014
Balance at beginning of period	$	3,207		$	2,709
Change in accruals for warranties during the period		2,839			1,717
Settlements during the period		(2,112	)		(1,219	)
Balance at end of period	$	3,934		$	3,207

Warrants and Derivative Liabilities (Tables)

12 Months Ended

Mar. 31, 2015

Class Of Warrant Or Right [Line Items]

Schedule of Fair Value Assumptions Used to Calculate Value of Convertible Note Derivative Feature

Following is a summary of the key assumptions used to value the convertible notes derivative features:

	March 31,			December 31,			September 30,			June 30,
Fiscal Year 13	2014			2013			2013			2013

Principal outstanding (000's)	$ —			$	10,411		$	10,411		$	14,389
Stock price	N/A			$	16.40		$	23.40		$	26.40
Percentage volume condition met	— %				87.20	%		80.20	%		87.50	%
Expected volatility	— %				68.63	%		66.26	%		65.80	%
Risk free rate	— %				0.12	%		0.10	%		0.21	%
Bond yield	— %				16.50	%		15.50	%		16.70	%
Recovery rate	— %				35.00	%		35.00	%		37.00	%
Redeemable	N/A			yes			yes			yes
Total time (years)	—				0.75			1.00			1.26
Dilution effect	N/A			yes			yes			yes
Fair value	$ —			$ —			$ 0.2 million			$ 0.5 million
Fair value as a percent of par	— %				0.02	%		0.70	%		3.30	%



							Post-modification			Pre-modification
	March 31,			December 31,			December 20,			December 20,			September 30,			June 30,			April 4,
Fiscal Year 12	2013			2012			2012			2012			2012			2012			2012

Principal outstanding (000's)	$	15,380		$	20,944		$	20,944		$	24,074		$	24,074		$	25,000		$	25,000
Stock price	$	26.70		$	26.20		$	29.50		$	29.50		$	41.50		$	46.80		$	39.70
Percentage volume condition met		80.50	%		94.50	%		94.90	%		28.60	%		51.00	%		75.20	%		85.90	%
Expected volatility		66.91	%		73.50	%		72.50	%		72.50	%		70.00	%		71.00	%		75.00	%
Risk free rate		0.20	%		0.23	%		0.25	%		0.25	%		0.23	%		0.33	%		0.44	%
Bond yield		16.50	%		16.50	%		16.50	%		16.50	%		15.00	%		16.00	%		15.00	%
Recovery rate		30.00	%		30.00	%		30.00	%		30.00	%		30.00	%		30.00	%		30.00	%
Redeemable	yes			yes			yes			yes			yes			yes			yes
Total time (years)		1.51			1.76			1.79			1.79			2.01			2.28			2.50
Dilution effect	yes			yes			yes			yes			yes			yes			yes
Fair value	$ 0.5 million			$ 1.0 million			$ 1.5 million			$ 0.9 million			$ 2.8 million			$ 4.5 million			$ 3.8 million
Fair value as a percent of par		3.40	%		4.90	%		7.10	%		3.90	%		11.40	%		17.90	%		15.10	%

Senior Secured Term Loan Second Warrant

Class Of Warrant Or Right [Line Items]

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the Second Warrant:

				Pre-Exchange
	December 31,			December 19,			September 30,			June 30,
Fiscal Year 14	2014			2014			2014			2014

Risk-free interest rate		—	%		1.65	%		1.65	%		1.57	%
Expected annual dividend yield		—	%		—	%		—	%		—	%
Expected volatility		—	%		71.82	%		78.10	%		80.00	%
Term (years)	—				4.41			4.62			4.87
Fair value	—			$0.1 million			$ 0.2 million			$ 0.3 million

							New Issuance
	March 31,			December 31,			November 15,
Fiscal Year 13	2014			2013			2013

Risk-free interest rate		1.76	%		1.89	%		1.55	%
Expected annual dividend yield		—	%		—	%		—	%
Expected volatility		79.73	%		80.37	%		76.97	%
Term (years)		5.12			5.37			5.49
Fair value	$ 0.3 million			$ 0.3 million			$ 0.3 million

Senior Secured Term Loan New Warrant

Class Of Warrant Or Right [Line Items]

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the Warrant:

							New Issuance
	March 31,			December 31,			December 19,
Fiscal Year 14	2015			2014			2014

Risk-free interest rate		1.41	%		1.73	%		1.74	%
Expected annual dividend yield		—	%		—	%		—	%
Expected volatility		74.60	%		77.43	%		70.26	%
Term (years)		5.25			5.50			5.53
Fair value	$0.2 million			$0.2 million			$0.2 million

November 2014 Warrant

Class Of Warrant Or Right [Line Items]

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the November 2014 Warrant:

							New Issuance
	March 31,			December 31,			November 13,
Fiscal Year 14	2015			2014			2014

Risk-free interest rate		1.28	%		1.61	%		1.64	%
Expected annual dividend yield		—	%		—	%		—	%
Expected volatility		75.96	%		78.00	%		72.86	%
Term (years)		4.62			4.87			5.00
Fair value	$2.5 million			$3.2 million			$4.3 million

Loan and Security Agreement

Class Of Warrant Or Right [Line Items]

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the First Warrant:

				Pre-Exchange
	December 31,			December 19,			September 30,			June 30,
Fiscal Year 14	2014			2014			2014			2014

Risk-free interest rate		—	%		1.10	%		1.13	%		1.04	%
Expected annual dividend yield		—	%		—	%		—	%		—	%
Expected volatility		—	%		67.01	%		78.30	%		82.75	%
Term (years)	—				2.96			3.18			3.43
Fair value	—			$ 0.1 million			$ 0.1 million			$ 0.1 million

							Post-modification			Pre-modification
	March 31,			December 31,			November 15,			November 15,			September 30,			June 30,
Fiscal Year 13	2014			2013			2013			2013			2013			2013

Risk-free interest rate		1.18	%		1.24	%		1.00	%		1.00	%		1.09	%		1.20	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%		—	%
Expected volatility		80.73	%		74.79	%		72.64	%		72.64	%		72.10	%		72.30	%
Term (years)		3.68			3.93			4.05			4.05			4.18			4.43
Fair value	$ 0.1 million			$ 0.1 million			$ 0.1 million			$ 0.1 million			$ 0.2 million			$ 0.2 million



	March 31,			December 31,			September 30,			June 30,			June 5,
Fiscal Year 12	2013			2012			2012			2012			2012

Risk-free interest rate		0.70	%		0.75	%		0.64	%		0.80	%		0.77	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%
Expected volatility		72.01	%		80.14	%		81.18	%		80.32	%		79.99	%
Term (years)		4.68			4.93			5.18			5.44			5.50
Fair value	$ 0.2 million			$ 0.2 million			$ 0.4 million			$ 0.5 million			$ 0.4 million

Securities Purchase Agreement

Class Of Warrant Or Right [Line Items]

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the warrant:

	March 31,			December 31,			September 30,			June 30,
Fiscal Year 14	2015			2014			2014			2014

Risk-free interest rate		0.73	%		1.00	%		1.07	%		0.98	%
Expected annual dividend yield		—	%		—	%		—	%		—	%
Expected volatility		70.42	%		72.38	%		76.20	%		83.50	%
Term (years)	2.51			2.76			3.01			3.26
Fair value	$0.3 million			$0.5 million			$1.5 million			$2.3 million
							Post-modification			Pre-modification
	March 31,			December 31,			October 9,			October 9,			September 30,			June 30,
Fiscal Year 13	2014			2013			2013			2013			2013			2013

Risk-free interest rate		1.11	%		1.17	%		1.05	%		1.05	%		1.02	%		1.13	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%		—	%
Expected volatility		80.99	%		75.60	%		71.45	%		71.45	%		71.98	%		71.90	%
Term (years)	3.51			3.76			3.99			3.99				4.01			4.27
Fair value	$ 2.2 million			$ 2.2 million			$ 3.2 million			$ 2.2 million			$ 2.5 million			$ 3.0 million


	March 31,			December 31,			September 30,			June 30,			April 4,
Fiscal Year 12	2013			2012			2012			2012			2012

Risk-free interest rate		0.67	%		0.75	%		0.63	%		0.77	%		1.19	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%
Expected volatility		71.74	%		80.60	%		80.90	%		80.80	%		80.00	%
Term (years)		4.51			4.76			5.01			5.28			5.50
Fair value	$ 3.4 million			$ 4.4 million			$ 7.1 million			$ 8.6 million			$ 7.0 million

- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

+ References+ Details

- Definition

Tabular disclosure of the application of the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide. Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected, provide the aggregate carrying amount of ineligible items included in each line item in the balance sheet, if any; (b) the difference between the aggregate fair value and the aggregate unpaid principal balance (assuming contractual principal amounts and fair value option elected) of: (i) loans and long-term receivables (other than securities otherwise reported at fair value) and (ii) long-term debt instruments; (c) for loans held as assets for which the fair value option has been elected: (i) the aggregate fair value of loans that are 90 days or more past due, (ii) if the policy is to recognize interest income separately from other changes in fair value, the aggregate fair value of loans in nonaccrual status, and (iii) the difference between the aggregate fair value and the aggregate unpaid principal balance for loans that are 90 days or more past due, in nonaccrual status, or both; (2) for items included in the income statement: (a) the amounts of gains and losses from fair value changes included in earnings and in which line in the income statement those gains and losses are reported whether or not combined with gains and losses from items required to be accounted for at fair value; (b) for loans and other receivables held as assets, the estimated amount of gains or losses included in earnings attributable to changes in instrument-specific credit risk; (c) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk, the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk; and (3) certain other disclosures as required or determined to be provided.

+ References+ Details

Income Taxes (Tables)

12 Months Ended

Mar. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Income (Loss) Before Income Taxes

Income (loss) before income taxes for the years ended March 31, 2015, 2014, and 2013 are provided in the table as follows (in thousands):

	For the years ended March 31,
	2015			2014			2013
Income (loss) before income tax expense:
U.S.	$	(40,277	)	$	(91,558	)	$	(66,975	)
Foreign		(8,563	)		36,152			580
Total	$	(48,840	)	$	(55,406	)	$	(66,395	)

Schedule of Components of Income Tax Expense (Benefit) Attributable to Continuing Operations

The components of income tax expense (benefit) attributable to continuing operations consist of the following (in thousands):

	For the years ended March 31,
	2015			2014			2013
Current
Federal	$	47		$	287		$	94
State		-			-			-
Foreign		(274	)		614			(438	)
Total current		(227	)		901			(344	)

Deferred
Federal		43			(49	)		93
State		-			-			-
Foreign		-			-			(13	)
Total deferred		43			(49	)		80

Income tax (benefit) expense	$	(184	)	$	852		$	(264	)

Schedule of Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate

The reconciliation between the statutory federal income tax rate and the Company’s effective income tax rate is shown below.

	For the years ended March 31,
	2015				2014				2013
Statutory federal income tax rate		(34	)	%		(34	)	%		(34	)	%
State income taxes, net of federal benefit		2				-				(3	)
Deemed dividend		1				1				2
Foreign income tax rate differential		6				(6	)			(2	)
Stock options		1				2				(2	)
Nondeductible expenses		1				1				1
Research and development tax credit		-				-				(1	)
Deferred Warrants		(3	)			(1	)
Interest expense		-				5				7
Extinguishment of debt		-				3				-
Reversal of uncertain tax benefits		(6	)			-				-
Valuation allowance		32				30				32
Effective income tax rate		-		%		1		%		-		%

Schedule of Deferred Tax Assets and Liabilities

The following is a summary of the principal components of the Company’s deferred tax assets and liabilities (in thousands):

	For the years ended March 31,
	2015			2014
Deferred tax assets:
Net operating loss carryforwards	$	272,498		$	260,254
Research and development and other tax credit carryforwards		10,655			10,613
Accruals and reserves		37,153			36,214
Fixed assets and intangible assets		2,432			2,855
Other		18,514			19,594
Gross deferred tax assets		341,252			329,530
Valuation allowance		(294,860	)		(282,824	)
Total deferred tax assets		46,392			46,706

Deferred tax liabilities:
Intercompany debt		(36,298	)		(36,102	)
Other		(10,174	)		(10,641	)
Total deferred tax liabilities		(46,472	)		(46,743	)
Net deferred tax liabilities	$	(80	)	$	(37	)

Schedule of Uncertainties in Income Tax Provision Liability

A tabular roll-forward of the Company’s uncertainties in income tax provision liability is presented below (in thousands):

Balance at March 31, 2013	$	1,061
Increase for tax positions		-
Balance at March 31, 2014	$	1,061
Reversal of uncertain tax positions		(1,061)
Balance at March 31, 2015	$	-

Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2015

Stockholders Equity Note [Abstract]

Components of Employee Stock-Based Compensation

The components of employee stock-based compensation for the years ended March 31, 2015, 2014 and 2013 were as follows (in thousands):

	For the Years Ended March 31,
	2015		2014		2013
Stock options	$	1,851	$	2,730	$	3,389
Restricted stock and stock awards		4,063		7,936		4,698
Employee stock purchase plan		22		30		51
Total stock-based compensation expense	$	5,936	$	10,696	$	8,138

Summary of Stock-Based Compensation Expense

The following table summarizes employee stock-based compensation expense by financial statement line item for the years ended March 31, 2015, 2014 and 2013 (in thousands):

	2015		2014		2013
Cost of revenues	$	719	$	1,002	$	726
Research and development		1,728		2,751		2,456
Selling, general and administrative		3,489		6,943		4,956
Total	$	5,936	$	10,696	$	8,138

Summary of Employee and Non-Employee Stock Options Activity

The following table summarizes the information concerning currently outstanding and exercisable employee and non-employee options:

						Weighted-
				Weighted-		Average
				Average		Remaining		Aggregate
	Options/			Exercise		Contractual		Intrinsic Value
	Shares			Price		Term		(thousands)
Outstanding at March 31, 2014		294,184		$	109.31
Granted		100,000			14.30
Exercised		-			-
Cancelled/forfeited		(13,244	)		103.51
Outstanding at March 31, 2015		380,940		$	84.57		6.6	$	-
Exercisable at March 31, 2015		210,869		$	135.95		5.0	$	-
Fully vested and expected to vest at March 31, 2015		363,021		$	87.94		6.5	$	-

Schedule of Weighted Average Assumptions used in Black-Scholes Valuation Model for Stock Options Granted

The weighted average assumptions used in the Black-Scholes valuation model for stock options granted during the years ended March 31, 2015, 2014, and 2013 are as follows:

	For the Years Ended March 31,
	2015			2014			2013
Expected volatility		85.5	%		75.1	%		72.0	%
Risk-free interest rate		1.9	%		1.7	%		0.9	%
Expected life (years)		5.8			5.9			5.9
Dividend yield	None			None			None

Summary of the Employee and Non-Employee Restricted Stock Activity

The following table summarizes the employee and non-employee restricted stock activity for the year ended March 31, 2015:

				Weighted		Intrinsic
				Average		Aggregate
				Grant Date		Value
	Shares			Fair Value		(thousands)
Outstanding at March 31, 2014		241,536		$	33.43
Granted		332,782			16.68
Vested		(210,942	)		29.09
Forfeited		(22,788	)		18.91
Outstanding at March 31, 2015		340,588		$	20.82	$	2,193

Commitments and Contingencies (Tables)

12 Months Ended

Mar. 31, 2015

Commitments And Contingencies Disclosure [Abstract]

Schedule of Minimum Future Lease Commitments

Minimum future lease commitments at March 31, 2015 were as follows (in thousands):

For the years ended March 31,	Total
2016	$	1,211
2017		652
2018		367
2019		224
2020		160
Thereafter		154
Total	$	2,768

Schedule of Rent Expense Under Operating Leases

Rent expense under the operating leases mentioned above was as follows (in thousands):

	For the years ended
	March 31,
	2015		2014		2013
Rent expense	$	2,091	$	2,152	$	2,437

Minority Investments (Tables)

12 Months Ended

Mar. 31, 2015

Equity Method Investments And Joint Ventures [Abstract]

Schedule of Net Investment in Tres Amigas LLC

The net investment activity for the year ended March 31, 2015 is as follows (in thousands):

Balance at April 1, 2014	$	1,845
Minority interest in net losses		(743	)
Balance at March 31, 2015	$	1,102

Schedule of Net Investment in Blade Dynamics Ltd

The net investment activity for the year ended March 31, 2015 is as follows (in thousands):

Balance at April 1, 2014	$	3,690
Net foreign exchange rate impact		(226	)
Impairment		(3,464	)
Balance at March 31, 2015	$	-

Restructuring (Tables)

12 Months Ended

Mar. 31, 2015

Restructuring And Related Activities [Abstract]

Schedule of Restructuring Charges and Cash Payments

The following table presents restructuring charges and cash payments (in thousands):

	Severance pay			Facility exit and
	and benefits			Relocation costs			Total
Accrued restructuring balance at April 1, 2013	$	145		$	54		$	199
Charges to operations		1,710			23			1,733
Cash payments		(836	)		(37	)		(873	)
Non-cash/miscellaneous reductions		(175	)		(39	)		(215	)
Accrued restructuring balance at March 31, 2014	$	844		$	-		$	844
Charges to operations		618			1,284			1,902
Cash payments		(1,282	)		(1,284	)		(2,566	)
Accrued restructuring balance at March 31, 2015	$	180		$	-		$	180

Business Segment and Geographic Information (Tables)

12 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Operating Results for Two Business Segments

The operating results for the two business segments are as follows (in thousands):

	For the Years Ended March 31,
	2015		2014		2013
Revenues:
Wind	$	51,307	$	55,608	$	44,231
Grid		19,223		28,509		43,188
Total	$	70,530	$	84,117	$	87,419

	For the Years Ended March 31,
	2015			2014			2013
Operating loss:
Wind	$	(14,321	)	$	(5,213	)	$	(16,098	)
Grid		(26,890	)		(22,523	)		(23,815	)
Unallocated corporate expenses		(11,306	)		(13,693	)		(17,828	)
Total	$	(52,517	)	$	(41,429	)	$	(57,741	)

Total Business Segments Assets

Total business segments assets are as follows (in thousands):

	March 31,		March 31,
	2015		2014
Wind	$	41,947	$	36,701
Grid		42,482		54,342
Corporate assets		49,396		77,466
Total	$	133,825	$	168,509

Geographic Information about Revenue, Based on Shipments to Customers by Region

Geographic information about revenue, based on shipments to customers by region, is as follows (in thousands):

	For the Years Ended March 31,
	2015		2014		2013
U.S.	$	9,820	$	11,013	$	13,197
Canada		2,690		3,312		1,663
Europe		2,905		7,453		14,709
China		10,410		24,748		17,906
Korea		3,506		6,429		10,945
India		39,314		26,384		17,062
Australia		1,885		4,779		11,937
Total	$	70,530	$	84,117	$	87,419

Geographic Information about Property, Plant and Equipment Associated with Particular Regions

Geographic information about property, plant and equipment associated with particular regions is as follows (in thousands):

	March 31,
	2015		2014
North America	$	54,673	$	62,426
Europe		854		1,232
Asia Pacific		570		916
Total	$	56,097	$	64,574

Quarterly Financial Data (Tables)

12 Months Ended

Mar. 31, 2015

Quarterly Financial Data [Abstract]

Schedule Of Quarterly Financial Data

(In thousands, except per share amount)	For the year ended March 31, 2015:
Three Months Ended	June 30,			September 30,			December 31,			March 31,
	2014			2014			2014			2015
Total revenue	$	11,696		$	12,455		$	21,250		$	25,129
Operating loss		(12,667	)		(26,400	)		(7,735	)		(5,715	)
Net loss		(13,517	)		(25,423	)		(6,353	)		(3,363	)
Net loss per common share—basic		(1.74	)		(3.12	)		(0.72	)		(0.36	)
Net loss per common share—diluted		(1.74	)		(3.12	)		(0.72	)		(0.36	)

	For the year ended March 31, 2014:
Three Months Ended	June 30,			September 30,			December 31,			March 31,
	2013			2013			2013			2014
Total revenue	$	23,086		$	24,181		$	20,563		$	16,287
Operating loss		(8,850	)		(11,028	)		(6,675	)		(14,876	)
Net loss		(10,513	)		(14,623	)		(8,417	)		(22,705	)
Net loss per common share—basic		(1.80	)		(2.39	)		(1.35	)		(3.30	)
Net loss per common share—diluted		(1.80	)		(2.39	)		(1.35	)		(3.30	)

Nature of the Business and Operations and Liquidity - Additional Information (Detail)	0 Months Ended		12 Months Ended				0 Months Ended				12 Months Ended
	Mar. 24, 2015	Nov. 13, 2014 USD ($)	Mar. 31, 2015 USD ($) Employee	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Apr. 29, 2015 Subsequent Event USD ($)	Feb. 04, 2015 Ghodawat Energy Pvt Ltd USD ($)	Feb. 04, 2015 Ghodawat Energy Pvt Ltd EUR (€)	Aug. 29, 2014 Ghodawat Energy Pvt Ltd EUR (€)	Mar. 31, 2015 Ghodawat Energy Pvt Ltd EUR (€)
Description Of Business [Line Items]
Reverse stock split	0.1	0.1
Accumulated deficit			$ (905,045,000)	$ (856,389,000)
Cash and cash equivalents			20,490,000	43,114,000	39,243,000	46,279,000
Net cash used in operating activities			32,676,000	13,267,000	45,271,000
Liability for damages										8,300,000
Interest rate accrued on liability for damage										5.33%
Settlement amount			(8,987,000)						7,450,000		7,450,000
Cash payments for legal settlements								8,400,000
Number of workforce persons			318
Cash flows from financing activities			52,800,000	52,800,000	52,800,000
Proceeds from additional equity offering		$ 9,100,000					$ 22,300,000

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Inventory reserve	$ 1.4	$ 0.3
Benefit to cost of revenues	8.0	4.3	2.1
Impairment charge		0	5.0
Payments received from customers	0	3.7	3.4
Percentage of tax benefit likely to be realized upon ultimate settlement	50.00%
Repatriated amount	1.2
Common equivalent shares not included in the calculation of diluted EPS	1,567,352	643,158	1,072,584
Net foreign currency transaction and hedging gains (losses)	2.8	0.1	1.0
Loss contingency accrual			1.8
Ghodawat Energy Pvt Ltd
Reversed legal expenses	2.2
Foreign Earnings Repatriated
Federal and state deferred tax liability	0.4
Blade Dynamics Ltd
Impairment charge	$ 3.5	$ 1.3
Maximum
Warranty period	3 years
Minimum
Warranty period	1 year
Credit Concentration Risk \| Accounts Receivable \| Inox Wind Limited
Risk percentage	56.00%	20.00%
Credit Concentration Risk \| Accounts Receivable \| Inox Wind Limited \| Maximum
Risk percentage	56.00%
Credit Concentration Risk \| Accounts Receivable \| Inox Wind Limited \| Minimum
Risk percentage	10.00%
Credit Concentration Risk \| Accounts Receivable \| CG Power Solutions UK Ltd
Risk percentage		14.00%
Credit Concentration Risk \| Accounts Receivable \| JINGCHENG New Energy
Risk percentage		13.00%

Summary of Significant Accounting Policies - Estimated Useful Life of Property, Plant and Equipment (Detail)	12 Months Ended
	Mar. 31, 2015
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	40 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years, description	Shorter of the estimated useful life or the remaining lease term
Minimum \| Process Upgrades to the Building
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	10 years
Minimum \| Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	3 years
Minimum \| Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	3 years
Maximum \| Process Upgrades to the Building
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	40 years
Maximum \| Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	10 years
Maximum \| Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	5 years

Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators of EPS Calculation (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Accounting Policies [Abstract]
Net loss	$ (3,363)	$ (6,353)	$ (25,423)	$ (13,517)	$ (22,705)	$ (8,417)	$ (14,623)	$ (10,513)	$ (48,656)	$ (56,258)	$ (66,131)
Weighted-average shares of common stock outstanding									8,559	6,411	5,354
Weighted-average shares subject to repurchase									(82)	(149)	(47)
Shares used in per-share calculation basic									8,477	6,262	5,307
Shares used in per-share calculation diluted									8,477	6,262	5,307
Basic	$ (0.36)	$ (0.72)	$ (3.12)	$ (1.74)	$ (3.30)	$ (1.35)	$ (2.39)	$ (1.80)	$ (5.74)	$ (8.98)	$ (12.46)
Diluted	$ (0.36)	$ (0.72)	$ (3.12)	$ (1.74)	$ (3.30)	$ (1.35)	$ (2.39)	$ (1.80)	$ (5.74)	$ (8.98)	$ (12.46)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References+ Details

Fair Value Measurements - Schedule of Assets and Liabilities Carried at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	$ 12,519	$ 17,675
Warrants	2,999	2,601
Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	12,519	17,675
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrants	$ 2,999	$ 2,601

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

Fair Value Measurements - Schedule of Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Ending balance	$ 2,999	$ 2,601
Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	2,601	3,633
Warrant issuance with equity offering	4,255
Warrant issuance with senior secured term loan	106	315
Mark to market adjustment	(3,963)	(1,347)
Ending balance	2,999	2,601
Derivative Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance		529
Mark to market adjustment		(525)
Extinguishment of derivative liability		$ (4)

- Definition

+ References+ Details

Accounts Receivable - Schedule of Accounts Receivable (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Receivables [Abstract]
Accounts receivable (billed)	$ 8,946	$ 6,113
Accounts receivable (unbilled)	987	1,459
Less: Allowance for doubtful accounts	(54)	(16)
Accounts receivable, net	$ 9,879	$ 7,556

Accounts Receivable - Additional Information (Detail) (Credit Concentration Risk, Accounts Receivable)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Inox Wind Limited
Accounts Notes And Loans Receivable [Line Items]
Risk percentage	56.00%	20.00%
CG Power Solutions UK Ltd
Accounts Notes And Loans Receivable [Line Items]
Risk percentage		14.00%
JINGCHENG New Energy
Accounts Notes And Loans Receivable [Line Items]
Risk percentage		13.00%

Inventory - Schedule of Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 9,411	$ 3,304
Work-in-process	2,117	4,047
Finished goods	7,487	10,275
Deferred program costs	1,581	3,068
Net inventory	$ 20,596	$ 20,694

Property, Plant and Equipment - Schedule of Cost and Accumulated Depreciation of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 125,465	$ 128,526
Less accumulated depreciation	(69,368)	(63,952)
Property, plant and equipment, net	56,097	64,574
Land
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	3,643	3,643
Construction In Progress-Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	130	117
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	34,549	34,341
Equipment And Software
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	81,855	83,861
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,156	1,353
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 4,132	$ 5,211

Intangible Assets - Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	$ 9,280	$ 10,209
Intangible assets, Accumulated Amortization	(7,858)	(8,214)
Intangible assets, Net Book Value	1,422	1,995
Licenses
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	4,422	4,473
Intangible assets, Accumulated Amortization	(3,328)	(2,962)
Intangible assets, Net Book Value	1,094	1,511
Intangible assets, Estimated Useful Life	7 years
Core Technology And Know How
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	4,858	5,736
Intangible assets, Accumulated Amortization	(4,530)	(5,252)
Intangible assets, Net Book Value	$ 328	$ 484
Core Technology And Know How \| Minimum
Finite Lived Intangible Assets [Line Items]
Intangible assets, Estimated Useful Life	5 years
Core Technology And Know How \| Maximum
Finite Lived Intangible Assets [Line Items]
Intangible assets, Estimated Useful Life	10 years

Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 0.6	$ 0.8	$ 0.9

Intangible Assets - Schedule of Expected Future Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
2016	$ 568
2017	553
2018	301
Intangible assets, Net Book Value	$ 1,422	$ 1,995

Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Payables And Accruals [Abstract]
Accounts payable	$ 7,062	$ 1,749
Accrued inventories in-transit	1,127	212
Accrued miscellaneous expenses	2,695	5,935
Accrued outside services	582	3,716
Accrued subcontractor program costs		290
Accrued compensation	5,937	6,080
Income taxes payable	278	173
Accrued adverse purchase commitments		402
Accrued warranty	3,934	3,207	2,709
Total	$ 21,615	$ 21,764

Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Payables And Accruals [Abstract]
Balance at beginning of period	$ 3,207	$ 2,709
Change in accruals for warranties during the period	2,839	1,717
Settlements during the period	(2,112)	(1,219)
Balance at end of period	$ 3,934	$ 3,207

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References+ Details

Debt - Additional Information (Detail) (USD $)	12 Months Ended									0 Months Ended	3 Months Ended	12 Months Ended		0 Months Ended					9 Months Ended	12 Months Ended	0 Months Ended				9 Months Ended	12 Months Ended			0 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
Debt - Additional Information (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Apr. 04, 2012	Mar. 02, 2014 Capital Ventures International	Mar. 31, 2014 Capital Ventures International	Mar. 31, 2014 Senior Convertible Debt	Mar. 31, 2013 Senior Convertible Debt	Oct. 09, 2013 Senior Convertible Debt Capital Ventures International	Apr. 04, 2012 Senior Convertible Debt Capital Ventures International	Mar. 02, 2014 New Unsecured Senior Convertible Note	Dec. 31, 2012 New Unsecured Senior Convertible Note	Apr. 04, 2012 New Unsecured Senior Convertible Note	Dec. 31, 2014 New Unsecured Senior Convertible Note Capital Ventures International	Dec. 31, 2014 New Unsecured Senior Convertible Note Capital Ventures International	Nov. 13, 2014 Senior Secured Loan	Nov. 15, 2013 Senior Secured Loan	Nov. 15, 2013 Senior Secured Loan Hercules Technology Growth Capital	Jun. 05, 2012 Senior Secured Loan Hercules Technology Growth Capital	Dec. 31, 2014 Senior Secured Loan Hercules Technology Growth Capital	Mar. 31, 2015 Senior Secured Loan Hercules Technology Growth Capital	Mar. 31, 2014 Senior Secured Loan Hercules Technology Growth Capital	Mar. 31, 2013 Senior Secured Loan Hercules Technology Growth Capital	Dec. 19, 2014 Senior Secured Loan Hercules Technology Growth Capital Second Amendment	Dec. 31, 2014 Senior Secured Loan Hercules Technology Growth Capital Second Amendment	Dec. 31, 2014 Senior Secured Loan Hercules Technology Growth Capital Second Amendment	Mar. 31, 2015 Senior Secured Loan Hercules Technology Growth Capital Second Amendment	Jun. 05, 2012 Senior Secured Loan Hercules Technology Growth Capital Minimum	Mar. 31, 2015 Senior Secured Loan Hercules Technology Growth Capital Maximum
Debt Instrument [Line Items]
Net proceeds after fees and expenses of purchase agreement															$ 23,200,000
Conversion price															$ 48.50		$ 31.90	$ 48.50
Premium over closing price, percentage															20.00%
Period before first installment payment															4 months
Shares registered for resale															1,026,231
Derivative Liability			500,000	200,000	500,000	1,000,000	2,800,000	4,500,000	3,800,000						3,800,000
Number of shares received from warrants received to purchase common stock															309,406							25,641	25,641	13,927					58,823
Strike price per share														$ 26.10	$ 54.50						$ 17.00	$ 19.50	$ 19.50	$ 35.90					$ 11.10
Fair value of warrants at issuance															7,000,000									400,000
Warrants	2,999,000	2,601,000																	500,000	500,000
Increase in derivative liability																			1,500,000
Total debt discount being amortized into interest expense	1,700,000	9,700,000	14,900,000																	13,100,000					1,000,000			1,200,000			300,000
Non-cash interest expense amortization of debt discount	500,000	7,700,000	12,400,000									4,100,000	8,200,000														500,000							100,000
Percentage of stock discount	85.00%
Number of trading days for valuation of shares	10 days
Non-cash interest expense issuing stock at discount		2,900,000	3,600,000
Debt conversion, shares issued										663,000						663,000
Loss on extinguishment of debt		(5,197,000)									(5,200,000)
Legal and origination costs																											200,000	300,000		100,000
Debt, face amount																							10,000,000	10,000,000					1,500,000
Net proceeds from debt																							9,800,000	9,700,000					1,400,000
Interest rate on loan																								11.00%
Prime rate																																	3.75%
End of term fee																									500,000			500,000			100,000
Interest expense	1,700,000	9,700,000	14,900,000																	13,100,000					1,000,000			1,200,000			300,000
Total debt discount being amortized into interest expense																										400,000	200,000
Minimum amount of proceeds from specified asset dispositions for mandatory prepayment feature																									1,000,000
Outstanding principal balance																										6,700,000
Debt Instrument, Maturity Date																															Jun. 01, 2017
Non-cash interest expense	566,000	7,713,000	12,426,000																													100,000
Covenant, unrestricted cash balance requirement																							5,000,000		5,000,000
Debt Instrument, Maturity Date, Description	As part of the Hercules Second Amendment, this Minimum Threshold was amended to be the lower of $5.0 million or the aggregate outstanding principal balance of the Term Loans. As of March 31, 2015, the Minimum Threshold was $5.0 million. As a result of the Company’s equity offering on April 29, 2015, the Minimum Threshold will be reduced to the lesser of $2.0 million or the aggregate outstanding principal balance of the Term Loans (See Note 19, “Subsequent Events”).
Repayments of term loan																										$ 2,000,000

Warrants and Derivative Liabilities - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended				12 Months Ended									0 Months Ended	3 Months Ended	12 Months Ended			0 Months Ended		3 Months Ended	0 Months Ended			1 Months Ended		0 Months Ended		12 Months Ended		0 Months Ended			3 Months Ended	12 Months Ended
	Mar. 24, 2015	Nov. 13, 2014	Nov. 15, 2013	Jun. 05, 2012	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Convertible Bond	Mar. 31, 2013 Convertible Bond	Mar. 31, 2015 Senior Secured Term Loan First Warrant	Mar. 31, 2014 Senior Secured Term Loan First Warrant	Mar. 31, 2013 Senior Secured Term Loan First Warrant	Mar. 31, 2015 Hudson Warrant	Mar. 24, 2015 Capital Ventures International	Dec. 31, 2014 Capital Ventures International	Mar. 31, 2015 Capital Ventures International	Mar. 31, 2014 Capital Ventures International	Mar. 31, 2013 Capital Ventures International	Oct. 09, 2013 Senior Convertible Debt Capital Ventures International	Apr. 04, 2012 Senior Convertible Debt Capital Ventures International	Dec. 31, 2014 Senior Convertible Debt Capital Ventures International	Mar. 02, 2014 New Unsecured Senior Convertible Note	Dec. 31, 2012 New Unsecured Senior Convertible Note	Apr. 04, 2012 New Unsecured Senior Convertible Note	Dec. 31, 2012 New Unsecured Senior Convertible Note Capital Ventures International Minimum	Dec. 31, 2012 New Unsecured Senior Convertible Note Capital Ventures International Maximum	Nov. 13, 2014 Senior Secured Loan	Nov. 15, 2013 Senior Secured Loan	Mar. 31, 2015 Senior Secured Loan Maximum	Mar. 31, 2014 Senior Secured Loan Maximum	Dec. 19, 2014 Senior Secured Loan Hercules Technology Growth Capital	Nov. 13, 2014 Senior Secured Loan Hercules Technology Growth Capital	Jun. 05, 2012 Senior Secured Loan Hercules Technology Growth Capital	Dec. 31, 2013 Senior Secured Loan Hercules Technology Growth Capital	Mar. 31, 2015 Senior Secured Loan Hercules Technology Growth Capital
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock																				309,406								25,641			58,823		13,927
Warrant exercise, waiting period																6 months
Warrant exercise period																5 years
Exercise price																			$ 26.10	$ 54.50	$ 22.10						$ 17.00	$ 19.50			$ 11.00		$ 35.90	$ 19.50	$ 17.00
Common stock, shares issued															909,090												909,090					909,090
Beneficial ownership limitation percentage																									4.99%	9.99%
Required notification period																61 days
Warrants to purchase one share of common stock		90.00%													90.00%
Reverse stock split	0.1	0.1												0.1
Gain (loss) in change of fair value of derivative instruments and warrants					$ 3,963	$ 1,872	$ 7,556	$ 500	$ 3,800	$ 100	$ 100	$ 200	$ 1,800			$ 1,900	$ 1,200	$ 3,600											$ 300	$ 0
Conversion price																							$ 31.90	$ 48.50
Debt conversion, shares issued																						663,000
Convertible debt instrument redemption waiting period					1 year
Convertible debt instrument contractual term					30 months
Warrants expiration date			May 15, 2019	Dec. 05, 2017
Common stock units offered		909,090
Number of warrants issued to purchase common stock		818,181
Shares issued, price per share		$ 11.00

Warrants and Derivative Liabilities - Schedule of Assumptions Used to Calculate the Fair Value of Warrants (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended							0 Months Ended			3 Months Ended												0 Months Ended				3 Months Ended											0 Months Ended				3 Months Ended					0 Months Ended	3 Months Ended		0 Months Ended	3 Months Ended
	Apr. 04, 2012	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 20, 2012 Post Modification	Dec. 20, 2012 Pre Modification	Apr. 04, 2012 Senior Convertible Note Warrant	Mar. 31, 2015 Senior Convertible Note Warrant	Dec. 31, 2014 Senior Convertible Note Warrant	Sep. 30, 2014 Senior Convertible Note Warrant	Jun. 30, 2014 Senior Convertible Note Warrant	Mar. 31, 2014 Senior Convertible Note Warrant	Dec. 31, 2013 Senior Convertible Note Warrant	Sep. 30, 2013 Senior Convertible Note Warrant	Jun. 30, 2013 Senior Convertible Note Warrant	Mar. 31, 2013 Senior Convertible Note Warrant	Dec. 31, 2012 Senior Convertible Note Warrant	Sep. 30, 2012 Senior Convertible Note Warrant	Jun. 30, 2012 Senior Convertible Note Warrant	Oct. 09, 2013 Senior Convertible Note Warrant Post Modification	Oct. 09, 2013 Senior Convertible Note Warrant Pre Modification	Dec. 19, 2014 Senior Secured Term Loan First Warrant	Jun. 05, 2012 Senior Secured Term Loan First Warrant	Dec. 31, 2014 Senior Secured Term Loan First Warrant	Sep. 30, 2014 Senior Secured Term Loan First Warrant	Jun. 30, 2014 Senior Secured Term Loan First Warrant	Mar. 31, 2014 Senior Secured Term Loan First Warrant	Dec. 31, 2013 Senior Secured Term Loan First Warrant	Sep. 30, 2013 Senior Secured Term Loan First Warrant	Jun. 30, 2013 Senior Secured Term Loan First Warrant	Mar. 31, 2013 Senior Secured Term Loan First Warrant	Dec. 31, 2012 Senior Secured Term Loan First Warrant	Sep. 30, 2012 Senior Secured Term Loan First Warrant	Jun. 30, 2012 Senior Secured Term Loan First Warrant	Nov. 15, 2013 Senior Secured Term Loan First Warrant Post Modification	Nov. 15, 2013 Senior Secured Term Loan First Warrant Pre Modification	Dec. 19, 2014 Senior Secured Term Loan Second Warrant	Nov. 15, 2013 Senior Secured Term Loan Second Warrant	Dec. 31, 2014 Senior Secured Term Loan Second Warrant	Sep. 30, 2014 Senior Secured Term Loan Second Warrant	Jun. 30, 2014 Senior Secured Term Loan Second Warrant	Mar. 31, 2014 Senior Secured Term Loan Second Warrant	Dec. 31, 2013 Senior Secured Term Loan Second Warrant	Dec. 19, 2014 Senior Secured Term Loan New Warrant	Mar. 31, 2015 Senior Secured Term Loan New Warrant	Dec. 31, 2014 Senior Secured Term Loan New Warrant	Nov. 13, 2014 November 2014 Warrant	Mar. 31, 2015 November 2014 Warrant	Dec. 31, 2014 November 2014 Warrant
Derivative [Line Items]
Risk-free interest rate	0.44%	0.12%	0.10%	0.21%	0.20%	0.23%	0.23%	0.33%	0.25%	0.25%	1.19%	0.73%	1.00%	1.07%	0.98%	1.11%	1.17%	1.02%	1.13%	0.67%	0.75%	0.63%	0.77%	1.05%	1.05%	1.10%	0.77%		1.13%	1.04%	1.18%	1.24%	1.09%	1.20%	0.70%	0.75%	0.64%	0.80%	1.00%	1.00%	1.65%	1.55%		1.65%	1.57%	1.76%	1.89%	1.74%	1.41%	1.73%	1.64%	1.28%	1.61%
Expected annual dividend yield	15.00%	16.50%	15.50%	16.70%	16.50%	16.50%	15.00%	16.00%	16.50%	16.50%
Expected volatility	75.00%	68.63%	66.26%	65.80%	66.91%	73.50%	70.00%	71.00%	72.50%	72.50%	80.00%	70.42%	72.38%	76.20%	83.50%	80.99%	75.60%	71.98%	71.90%	71.74%	80.60%	80.90%	80.80%	71.45%	71.45%	67.01%	79.99%		78.30%	82.75%	80.73%	74.79%	72.10%	72.30%	72.01%	80.14%	81.18%	80.32%	72.64%	72.64%	71.82%	76.97%		78.10%	80.00%	79.73%	80.37%	70.26%	74.60%	77.43%	72.86%	75.96%	78.00%
Term (years)	2 years 6 months	9 months	1 year	1 year 3 months 4 days	1 year 6 months 4 days	1 year 9 months 4 days	2 years 4 days	2 years 3 months 11 days	1 year 9 months 15 days	1 year 9 months 15 days	5 years 6 months	2 years 6 months 4 days	2 years 9 months 4 days	3 years 4 days	3 years 3 months 4 days	3 years 6 months 4 days	3 years 9 months 4 days	4 years 4 days	4 years 3 months 7 days	4 years 6 months 4 days	4 years 9 months 4 days	5 years 4 days	5 years 3 months 11 days	3 years 11 months 27 days	3 years 11 months 27 days	2 years 11 months 16 days	5 years 6 months	0 years	3 years 2 months 5 days	3 years 5 months 5 days	3 years 8 months 5 days	3 years 11 months 5 days	4 years 2 months 5 days	4 years 5 months 5 days	4 years 8 months 5 days	4 years 11 months 5 days	5 years 2 months 5 days	5 years 5 months 9 days	4 years 18 days	4 years 18 days	4 years 4 months 28 days	5 years 5 months 27 days	0 years	4 years 7 months 13 days	4 years 10 months 13 days	5 years 1 month 13 days	5 years 4 months 13 days	5 years 6 months 11 days	5 years 3 months	5 years 6 months	5 years	4 years 7 months 13 days	4 years 10 months 13 days
Fair value											$ 7.0	$ 0.3	$ 0.5	$ 1.5	$ 2.3	$ 2.2	$ 2.2	$ 2.5	$ 3.0	$ 3.4	$ 4.4	$ 7.1	$ 8.6	$ 3.2	$ 2.2	$ 0.1	$ 0.4	$ 0	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.2	$ 0.2	$ 0.2	$ 0.2	$ 0.4	$ 0.5	$ 0.1	$ 0.1	$ 0.1	$ 0.3	$ 0	$ 0.2	$ 0.3	$ 0.3	$ 0.3	$ 0.2	$ 0.2	$ 0.2	$ 4.3	$ 2.5	$ 3.2

Warrants and Derivative Liabilities - Schedule of Fair Value Assumptions Used to Calculate Value of Convertible Note Derivative Feature (Detail) (USD $)	0 Months Ended	3 Months Ended							12 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Apr. 04, 2012	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2015	Dec. 20, 2012 Post Modification	Mar. 31, 2015 Post Modification	Dec. 20, 2012 Pre Modification	Mar. 31, 2015 Pre Modification
Combined principal balances of the term loans	$ 25,000,000	$ 10,411,000	$ 10,411,000	$ 14,389,000	$ 15,380,000	$ 20,944,000	$ 24,074,000	$ 25,000,000		$ 20,944,000		$ 24,074,000
Stock price	$ 39.70	$ 16.40	$ 23.40	$ 26.40	$ 26.70	$ 26.20	$ 41.50	$ 46.80		$ 29.50		$ 29.50
Percentage volume condition met	85.90%	87.20%	80.20%	87.50%	80.50%	94.50%	51.00%	75.20%		94.90%		28.60%
Expected volatility	75.00%	68.63%	66.26%	65.80%	66.91%	73.50%	70.00%	71.00%		72.50%		72.50%
Risk-free interest rate	0.44%	0.12%	0.10%	0.21%	0.20%	0.23%	0.23%	0.33%		0.25%		0.25%
Expected annual dividend yield	15.00%	16.50%	15.50%	16.70%	16.50%	16.50%	15.00%	16.00%		16.50%		16.50%
Recovery rate	30.00%	35.00%	35.00%	37.00%	30.00%	30.00%	30.00%	30.00%		30.00%		30.00%
Redeemable									yes		yes		yes
Term (years)	2 years 6 months	9 months	1 year	1 year 3 months 4 days	1 year 6 months 4 days	1 year 9 months 4 days	2 years 4 days	2 years 3 months 11 days		1 year 9 months 15 days		1 year 9 months 15 days
Dilution effect									yes		yes		yes
Derivative Liability	$ 3,800,000		$ 200,000	$ 500,000	$ 500,000	$ 1,000,000	$ 2,800,000	$ 4,500,000		$ 1,500,000		$ 900,000
Fair value as a percent of par	15.10%	0.02%	0.70%	3.30%	3.40%	4.90%	11.40%	17.90%		7.10%		3.90%

Income Taxes - Schedule of Income (Loss) Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Taxes [Abstract]
U.S.	$ (40,277)	$ (91,558)	$ (66,975)
Foreign	(8,563)	36,152	580
Loss before income tax (benefit) expense	$ (48,840)	$ (55,406)	$ (66,395)

Income Taxes - Schedule of Components of Income Tax Expense (Benefit) Attributable to Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Taxes [Abstract]
Current, Federal	$ 47	$ 287	$ 94
Current, Foreign	(274)	614	(438)
Total current	(227)	901	(344)
Deferred, Federal	43	(49)	93
Deferred, Foreign			(13)
Total deferred	43	(49)	80
Income tax (benefit) expense	$ (184)	$ 852	$ (264)

- Definition

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References+ Details

- Definition

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

+ References+ Details

- Definition

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References+ Details

- Definition

Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References+ Details

- Definition

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References+ Details

Income Taxes - Schedule of Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate (Detail)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Taxes [Abstract]
Statutory federal income tax rate	(34.00%)	(34.00%)	(34.00%)
State income taxes, net of federal benefit	2.00%		(3.00%)
Deemed dividend	1.00%	1.00%	2.00%
Foreign income tax rate differential	6.00%	(6.00%)	(2.00%)
Stock options	1.00%	2.00%	(2.00%)
Nondeductible expenses	1.00%	1.00%	1.00%
Research and development tax credit			(1.00%)
Deferred Warrants	(3.00%)	(1.00%)
Interest expense		5.00%	7.00%
Extinguishment of debt		3.00%
Reversal of uncertain tax benefits	(6.00%)
Valuation allowance	32.00%	30.00%	32.00%
Effective income tax rate		1.00%

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Taxes [Abstract]
Net operating loss carryforwards	$ 272,498	$ 260,254
Research and development and other tax credit carryforwards	10,655	10,613
Accruals and reserves	37,153	36,214
Fixed assets and intangible assets	2,432	2,855
Other	18,514	19,594
Gross deferred tax assets	341,252	329,530
Valuation allowance	(294,860)	(282,824)
Total deferred tax assets	46,392	46,706
Intercompany debt	(36,298)	(36,102)
Other	(10,174)	(10,641)
Total deferred tax liabilities	(46,472)	(46,743)
Net deferred tax liabilities	$ (80)	$ (37)

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014
Deferred tax asset reflecting the benefit of deductions from the exercise of stock options	$ 13,200,000
Excess tax deductions from stock option exercised	52,400,000
Stock options exercised dates	March 31, 2006 through 2015
Repatriated amount	1,200,000
Minimum percentage of amount being realized upon ultimate settlement	50.00%
Uncertain tax positions	0
Unrecognized tax benefits that, if recognized, would result in a reduction of the Company's effective tax rate	0	1,100,000
Austria
Net operating loss carryforwards	51,500,000
China
Net operating loss carryforwards	28,600,000
ROMANIA
Net operating loss carryforwards	3,000,000
Federal
Net operating loss carryforwards	760,400,000
Research and development and other tax credit carryforwards	8,200,000
State
Net operating loss carryforwards	185,500,000
Research and development and other tax credit carryforwards	3,000,000
Foreign Earnings Repatriated
Federal and state deferred tax liability	400,000
Power Quality Systems, Inc.
Net operating loss carryforwards	$ 3,700,000
Maximum
Operating loss carryforwards expiration years	Mar. 31, 2035
Expiration of other tax credit carryforwards	Mar. 31, 2035
Maximum \| Austria
Income tax examination years	2015
Maximum \| China
Income tax examination years	2014
Maximum \| ROMANIA
Income tax examination years	2015
Maximum \| U.S
Income tax examination years	2015
Minimum
Operating loss carryforwards expiration years	Mar. 31, 2016
Expiration of other tax credit carryforwards	Mar. 31, 2016
Minimum \| Austria
Income tax examination years	2012
Minimum \| China
Income tax examination years	2008
Minimum \| ROMANIA
Income tax examination years	2014
Minimum \| U.S
Income tax examination years	1995

Income Taxes - Schedule of Uncertainties in Income Tax Provision Liability (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Beginning Balance	$ 1,061	$ 1,061
Ending Balance		1,061
Reversal of uncertain tax positions	$ (1,061)

Stockholders' Equity - Components of Employee Stock-Based Compensation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 5,936	$ 10,696	$ 8,138
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	1,851	2,730	3,389
Restricted Stock and Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	4,063	7,936	4,698
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 22	$ 30	$ 51

- Definition

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

+ References+ Details

Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended		12 Months Ended				12 Months Ended			12 Months Ended		12 Months Ended													12 Months Ended
	Mar. 24, 2015	Nov. 13, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Nov. 15, 2013 M L V And Co At Market Sales Agreement	Mar. 31, 2015 M L V And Co Atm Arrangement	Mar. 31, 2014 M L V And Co Atm Arrangement	Nov. 15, 2013 Maximum M L V And Co At Market Sales Agreement	Mar. 31, 2015 Stock Options	Mar. 31, 2014 Stock Options	Mar. 31, 2015 Stock Options Minimum	Mar. 31, 2015 Stock Options Maximum	Mar. 31, 2015 Restricted Stock and Stock Awards	Mar. 31, 2014 Restricted Stock and Stock Awards	Mar. 31, 2013 Restricted Stock and Stock Awards	Mar. 31, 2015 U.S. Treasury Rates Minimum	Mar. 31, 2015 U.S. Treasury Rates Maximum	Mar. 31, 2015 Performance-Based Restricted Stock	Mar. 31, 2014 Performance-Based Restricted Stock	Mar. 31, 2013 Performance-Based Restricted Stock	Mar. 31, 2015 Restricted Stock Units (RSUs)	Mar. 31, 2015 2007 Director Stock Option Plan	Mar. 31, 2015 2007 Stock Incentive Plan	Mar. 31, 2015 Employee Stock Purchase Plan
Stockholders Equity [Line Items]
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures										$ 1,200,000	$ 2,000,000			$ 2,600,000	$ 1,800,000
Weighted-average period over which unrecognized compensation expense is expected to be recognized (years)										2 years 8 months 12 days				1 year 2 months 12 days
Weighted-average grant-date fair value of stock option awards granted			$ 10.18	$ 16.20	$ 25.60
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value			0	0	0
Stock-based compensation plans expired terms																	5 years	7 years
Total fair value of restricted stock granted														5,600,000	4,500,000	10,600,000
Total fair value of restricted stock granted for bonuses and severance															500,000	1,600,000
Total fair value of restricted stock vested														3,100,000	3,700,000	3,400,000
Total fair value of restricted stock granted for bonuses and severance															500,000	1,600,000
Shares, Granted			332,782																38,021	40,201	142,212
Number of shares cancelled			22,788																			10,000
Stock-based compensation plans expired terms			May 02, 2007
Contractual life of options, in years			10 years
Vesting period, in years												3 years	5 years	3 years
Number of shares granted by option upon election to the board																							1,000
Number of shares awarded annually																							300
Grant date value of shares granted by option upon election to board																							40,000
Vesting period of shares granted by option upon election to board			2 years
Number of shares authorized for issuance under the plan																							64,700	557,578	16,708
Percentage of purchase discount																									15.00%
Compensation expense recognized			100,000	100,000	100,000
Common stock shares issued																									8,168
Common stock			96,000	79,000					30,000,000
Commission on sale of common stock under the ATM						3.00%
Proceeds From Issuance Of Common Stock		$ 9,100,000					$ 5,800,000	$ 7,500,000
Common stock, shares issued			9,624,275	7,892,990			375,000	487,000
Shares issued, price per share		$ 11.00					$ 16.05	$ 16.24
Reverse stock split, description			adjusted to reflect our 1-for-10 reverse stock split
Reverse stock split	0.1	0.1
Common stock units offered		909,090
Number of warrants issued to purchase common stock		818,181
Warrants to purchase one share of common stock		90.00%

Stockholders' Equity - Summary of Stock-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 5,936	$ 10,696	$ 8,138
Cost of Revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	719	1,002	726
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,728	2,751	2,456
Selling, General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 3,489	$ 6,943	$ 4,956

- Definition

+ References+ Details

Stockholders' Equity - Summary of Employee and Non-Employee Stock Options Activity (Detail) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options/Shares, Outstanding at March 31, 2014	294,184
Options/Shares, Granted	100,000
Options/Shares, Cancelled/Forfeited	(13,244)
Options/Shares, Outstanding at March 31, 2015	380,940
Options/Shares, Exercisable at March 31, 2015	210,869
Options/Shares, Fully vested and expected to vest at March 31, 2015	363,021
Weighted-Average Exercise Price, Outstanding at March 31, 2014	$ 109.31
Weighted-Average Exercise Price, Granted	$ 14.30
Weighted-Average Exercise Price, Cancelled/Forfeited	$ 103.51
Weighted-Average Exercise Price, Outstanding at March 31, 2015	$ 84.57
Weighted-Average Exercise Price, Exercisable at March 31, 2015	$ 135.95
Weighted-Average Exercise Price, Fully vested and expected to vest at March 31, 2015	$ 87.94
Weighted-Average Remaining Contractual Term, Outstanding at March 31, 2015	6 years 7 months 6 days
Weighted-Average Remaining Contractual Term, Exercisable at March 31, 2015	5 years
Weighted-Average Remaining Contractual Term, Fully vested and expected to vest at March 31, 2015	6 years 6 months
Aggregate Intrinsic Value, Outstanding at March 31, 2015	$ 0	$ 0	$ 0

Stockholders' Equity - Schedule of Weighted Average Assumptions used in Black-Scholes Valuation Model for Stock Options Granted (Detail)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected volatility	85.50%	75.10%	72.00%
Risk-free interest rate	1.90%	1.70%	0.90%
Expected life (years)	5 years 9 months 18 days	5 years 10 months 24 days	5 years 10 months 24 days
Dividend yield	0.00%	0.00%	0.00%

Stockholders' Equity - Summary of the Employee and Non-Employee Restricted Stock Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Outstanding at April 1, 2014	241,536
Shares, Granted	332,782
Shares, Vested	(210,942)
Shares, Forfeited	(22,788)
Shares, Outstanding at March 31, 2015	340,588
Weighted Average Grant Date Fair Value, Outstanding at April 1, 2014	$ 33.43
Weighted Average Grant Date Fair Value, Granted	$ 16.68
Weighted Average Grant Date Fair Value, Vested	$ 29.09
Weighted Average Grant Date Fair Value, Forfeited	$ 18.91
Weighted Average Grant Date Fair Value, Outstanding at March 31, 2015	$ 20.82
Intrinsic Aggregate Value, Outstanding at March 31, 2015	$ 2,193

Commitments and Contingencies - Additional Information (Detail)	0 Months Ended			12 Months Ended			0 Months Ended						3 Months Ended	12 Months Ended		0 Months Ended										12 Months Ended		0 Months Ended
	Nov. 19, 2013 USD ($)	Jul. 05, 2011 Claim	May 12, 2011 Employee Claim	Mar. 31, 2015 USD ($) sqft	Jun. 11, 2014 USD ($)	Mar. 31, 2014 USD ($)	Jun. 17, 2011 Bonds USD ($) Claim	Feb. 04, 2015 Ghodawat Energy Pvt Ltd EUR (€)	Aug. 29, 2014 Ghodawat Energy Pvt Ltd EUR (€)	Jan. 14, 2014 Ghodawat Energy Pvt Ltd USD ($)	May 12, 2011 Ghodawat Energy Pvt Ltd USD ($)	May 12, 2011 Ghodawat Energy Pvt Ltd EUR (€)	Sep. 30, 2014 Ghodawat Energy Pvt Ltd USD ($)	Mar. 31, 2015 Ghodawat Energy Pvt Ltd USD ($)	Mar. 31, 2015 Ghodawat Energy Pvt Ltd EUR (€)	Feb. 27, 2012 Sinovel Wind Group Co. Ltd. USD ($)	Feb. 27, 2012 Sinovel Wind Group Co. Ltd. CNY	Dec. 22, 2011 Sinovel Wind Group Co. Ltd. USD ($)	Dec. 22, 2011 Sinovel Wind Group Co. Ltd. CNY	Oct. 17, 2011 Sinovel Wind Group Co. Ltd. USD ($)	Oct. 17, 2011 Sinovel Wind Group Co. Ltd. CNY	Oct. 08, 2011 Sinovel Wind Group Co. Ltd. USD ($)	Oct. 08, 2011 Sinovel Wind Group Co. Ltd. CNY	Sep. 13, 2011 Sinovel Wind Group Co. Ltd. USD ($)	Sep. 13, 2011 Sinovel Wind Group Co. Ltd. CNY	Mar. 31, 2011 Sinovel Wind Group Co. Ltd. USD ($)	Mar. 31, 2011 Sinovel Wind Group Co. Ltd. CNY	Sep. 16, 2011 Dalian Guotong Electric Co. Ltd. USD ($)	Sep. 16, 2011 Dalian Guotong Electric Co. Ltd. CNY
Commitments And Contingencies [Line Items]
Accrued adverse purchase commitments						$ 402,000
Total space leased, square feet				272,000
Sought compensation amount	10,000,000										24,000,000	18,000,000				17,000,000	105,000,000	190,000,000	1,200,000,000	157,000,000	1,000,000,000	58,000,000	370,000,000			76,000,000	485,000,000
Counterclaims under License Agreement											8,000,000	6,000,000
Liability for damages							475,000		8,300,000
Interest rate accrued on liability for damage									5.33%
Loss contingency													10,200,000	500,000
Reimbursement of arbitration expenses										2,300,000
Reversed legal expenses														2,200,000
Settlement amount				(8,987,000)				7,450,000							7,450,000
Expected excess on reversal accrued arbitration liability														1,200,000
Number of putative securities complaints			7				4
Number of officers putative securities filed against			2
Number of complaints additionally asserted claims against the underwriters			1
Settlement amount expected to be funded by insurers	8,200,000
Settlement amount expected to be paid by issuance of common stock	1,800,000
Common stock, capital shares reserved for future issuance	94,488
Shortfall payment					500,000
Number of claims consolidated		3
Value of the undelivered components																										720,000,000	4,600,000,000
Damages claimed for unauthorized use of software																								6,000,000	38,000,000
Monetary damages for trade secret infringement																								453,000,000	2,900,000,000
Monetary losses from copyright infringement																												200,000	1,200,000
Restricted cash included in current assets				2,822,000		2,913,000
Restricted cash				$ 1,236,000		$ 3,394,000

Commitments and Contingencies - Schedule of Minimum Future Lease Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
2016	$ 1,211
2017	652
2018	367
2019	224
2020	160
Thereafter	154
Total	$ 2,768

Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Percentage of common stock matched under deferred compensation plan	50.00%
First certain percentage of eligible contribution under deferred compensation plan	6.00%
Recorded expense under deferred compensation plan	$ 0.4	$ 0.4	$ 0.5

Minority Investments - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Tres Amigas
Schedule Of Equity Method Investments [Line Items]
Number of commonly interconnected power grids	3
Equity method investment, aggregate cost	$ 5,400,000
Percentage of ownership interest hold	26.00%
Blade Dynamics Ltd
Schedule Of Equity Method Investments [Line Items]
Cost method investment, original cost	8,000,000
Percentage of ownership interest hold	12.00%
Impairment charge on investment	$ 3,464,000	$ 1,300,000

Minority Investments - Schedule of Net Investment Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Minority interest in net losses	$ (743)	$ (1,008)	$ (2,231)
Tres Amigas
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Beginning Balance	1,845
Minority interest in net losses	(743)
Ending Balance	1,102
Blade Dynamics Ltd
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Beginning Balance	3,690
Net foreign exchange rate impact	(226)
Impairment	(3,464)	(1,300)
Ending Balance	$ 0	$ 3,690

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Jul. 31, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Restructuring And Related Activities [Abstract]
Reduction in global workforce, percentage	7.00%
Employee severance and benefit costs		$ 1.9	$ 1.7	$ 2.5

- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Restructuring - Schedule of Restructuring Charges and Cash Payments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	$ 844	$ 199
Charges to operations	1,902	1,733
Cash payments	(2,566)	(873)
Non-cash/miscellaneous reductions		(215)
Accrued restructuring balance	180	844
Severance Pay And Benefits
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	844	145
Charges to operations	618	1,710
Cash payments	(1,282)	(836)
Non-cash/miscellaneous reductions		(175)
Accrued restructuring balance	180	844
Facility Exit And Relocation Costs
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance		54
Charges to operations	1,284	23
Cash payments	(1,284)	(37)
Non-cash/miscellaneous reductions		$ (39)

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Business Segment and Geographic Information - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2015 Segment	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Number of reportable business segments	2
Stock-based compensation expense	$ 5,936,000	$ 10,696,000	$ 8,138,000
Restructuring and impairment charges	5,400,000	3,000,000	7,900,000
Loss contingency accrual			$ 1,800,000
Geographic Concentration Risk \| Sales Revenue, Net \| Outside The United States
Segment Reporting Information [Line Items]
Risk percentage	86.00%	87.00%	85.00%
Customer Concentration Risk \| Sales Revenue, Net \| Inox Wind Limited
Segment Reporting Information [Line Items]
Risk percentage	56.00%	31.00%	19.00%
Customer Concentration Risk \| Sales Revenue, Net \| JCNE
Segment Reporting Information [Line Items]
Risk percentage		18.00%	13.00%
Minimum
Segment Reporting Information [Line Items]
Megawatts of drive trains and power ratings	2

- Definition

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Business Segment and Geographic Information - Operating Results for Two Business Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 25,129	$ 21,250	$ 12,455	$ 11,696	$ 16,287	$ 20,563	$ 24,181	$ 23,086	$ 70,530	$ 84,117	$ 87,419
Operating loss	(5,715)	(7,735)	(26,400)	(12,667)	(14,876)	(6,675)	(11,028)	(8,850)	(52,517)	(41,429)	(57,741)
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Operating loss									(11,306)	(13,693)	(17,828)
Wind
Segment Reporting Information [Line Items]
Revenues									51,307	55,608	44,231
Wind \| Operating Segments
Segment Reporting Information [Line Items]
Operating loss									(14,321)	(5,213)	(16,098)
Grid
Segment Reporting Information [Line Items]
Revenues									19,223	28,509	43,188
Grid \| Operating Segments
Segment Reporting Information [Line Items]
Operating loss									$ (26,890)	$ (22,523)	$ (23,815)

Business Segment and Geographic Information - Total Business Segments Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 133,825	$ 168,509
Operating Segments \| Wind
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	41,947	36,701
Operating Segments \| Grid
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	42,482	54,342
Corporate assets
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 49,396	$ 77,466

Business Segment and Geographic Information - Geographic Information about Revenue, Based on Shipments to Customers by Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 25,129	$ 21,250	$ 12,455	$ 11,696	$ 16,287	$ 20,563	$ 24,181	$ 23,086	$ 70,530	$ 84,117	$ 87,419
U.S
Segment Reporting Information [Line Items]
Revenues									9,820	11,013	13,197
Canada
Segment Reporting Information [Line Items]
Revenues									2,690	3,312	1,663
Europe
Segment Reporting Information [Line Items]
Revenues									2,905	7,453	14,709
China
Segment Reporting Information [Line Items]
Revenues									10,410	24,748	17,906
Korea
Segment Reporting Information [Line Items]
Revenues									3,506	6,429	10,945
India
Segment Reporting Information [Line Items]
Revenues									39,314	26,384	17,062
Australia
Segment Reporting Information [Line Items]
Revenues									$ 1,885	$ 4,779	$ 11,937

Business Segment and Geographic Information - Geographic Information about Property, Plant and Equipment Associated with Particular Regions (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 56,097	$ 64,574
North America
Segment Reporting Information [Line Items]
Property, plant and equipment, net	54,673	62,426
Europe
Segment Reporting Information [Line Items]
Property, plant and equipment, net	854	1,232
Asia Pacific
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 570	$ 916

Quarterly Financial Data - Schedule of Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Quarterly Financial Data [Abstract]
Total revenue	$ 25,129	$ 21,250	$ 12,455	$ 11,696	$ 16,287	$ 20,563	$ 24,181	$ 23,086	$ 70,530	$ 84,117	$ 87,419
Operating loss	(5,715)	(7,735)	(26,400)	(12,667)	(14,876)	(6,675)	(11,028)	(8,850)	(52,517)	(41,429)	(57,741)
Net loss	$ (3,363)	$ (6,353)	$ (25,423)	$ (13,517)	$ (22,705)	$ (8,417)	$ (14,623)	$ (10,513)	$ (48,656)	$ (56,258)	$ (66,131)
Net loss per common share—basic	$ (0.36)	$ (0.72)	$ (3.12)	$ (1.74)	$ (3.30)	$ (1.35)	$ (2.39)	$ (1.80)	$ (5.74)	$ (8.98)	$ (12.46)
Net loss per common share—diluted	$ (0.36)	$ (0.72)	$ (3.12)	$ (1.74)	$ (3.30)	$ (1.35)	$ (2.39)	$ (1.80)	$ (5.74)	$ (8.98)	$ (12.46)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended			0 Months Ended
	Nov. 13, 2014	Mar. 31, 2015	Mar. 31, 2014	Apr. 29, 2015 Subsequent Event	Apr. 24, 2015 Subsequent Event
Subsequent Event [Line Items]
Common stock, shares issued		9,624,275	7,892,990		4,000,000
Offer price of common stock	$ 11.00				$ 6.00
Proceeds From Issuance Of Common Stock	$ 9.1			$ 22.3

Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Allowance for Doubtful Accounts Receivable
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance, Beginning of Year	$ 16		$ 52
Additions	54	16
Write-offs	(16)		(52)
Balance, End of Year	54	16
Deferred Tax Asset Valuation Allowance
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance, Beginning of Year	282,824	261,961	252,302
Additions	15,189	26,649	21,333
Write-offs	(3,153)	(5,786)	(11,674)
Balance, End of Year	$ 294,860	$ 282,824	$ 261,961

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets	$ 3,690
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets	$ 3,690

Accounts Payable and Accrued Expenses - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2015
Minimum
Product Warranty Accrual [Line Items]
Warranty period	1 year
Maximum
Product Warranty Accrual [Line Items]
Warranty period	3 years