Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Mar. 31, 2016	May. 25, 2016	Sep. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2015
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		14,045,836
Entity Public Float			$ 50.2

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Current assets:
Cash and cash equivalents	$ 39,330	$ 20,490
Accounts receivable, net	19,264	9,879
Inventory	18,512	20,596
Prepaid expenses and other current assets	5,778	10,764
Restricted cash	457	2,822
Total current assets	83,341	64,551
Property, plant and equipment, net	49,778	56,097
Intangibles, net	854	1,422
Restricted cash	934	1,236
Deferred tax assets	96	7,766
Other assets	315	2,753
Total assets	135,318	133,825
Current liabilities:
Accounts payable and accrued expenses	23,156	21,615
Note payable, current portion, net of discount of $42 as of March 31, 2016 and $244 as of March 31, 2015	2,624	3,756
Derivative liabilities	3,227	2,999
Deferred revenue	12,000	11,019
Deferred tax liabilities		7,843
Total current liabilities	41,007	47,232
Note payable, net of discount of $133 as of March 31, 2016 and $290 as of March 31, 2015	1,367	3,877
Deferred revenue	9,269	2,756
Deferred tax liabilities	63
Other liabilities	63	67
Total liabilities	$ 51,769	$ 53,932
Commitments and contingencies (Note 13)
Stockholders' equity:
Common stock, $0.01 par value, 75,000,000 shares authorized; 14,107,126 and 9,624,275 shares issued at March 31, 2016 and 2015, respectively	$ 141	$ 96
Additional paid-in capital	1,011,813	985,921
Treasury stock, at cost, 51,506 and 34,067 shares at March 31, 2016 and 2015, respectively	(881)	(771)
Accumulated other comprehensive income (loss)	660	(308)
Accumulated deficit	(928,184)	(905,045)
Total stockholders' equity	83,549	79,893
Total liabilities and stockholders' equity	$ 135,318	$ 133,825

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Statement Of Financial Position [Abstract]
Note payable, Unamortized Discount, Current	$ 42	$ 244
Note payable, Unamortized Discount, Noncurrent	$ 133	$ 290
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	14,107,126	9,624,275
Treasury Stock, shares	51,506	34,067

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenues	$ 96,023	$ 70,530	$ 84,117
Cost of revenues	74,041	67,442	72,858
Gross profit	21,982	3,088	11,259
Operating expenses:
Research and development	12,303	11,878	12,173
Selling, general and administrative	28,861	29,217	37,230
Arbitration award expense		8,987
Restructuring and impairments	779	5,366	2,998
Amortization of acquisition related intangibles	157	157	287
Total operating expenses	42,100	55,605	52,688
Operating loss	(20,118)	(52,517)	(41,429)
Change in fair value of derivatives and warrants	(228)	3,963	1,872
Loss on extinguishment of debt			(5,197)
Gain on sale of minority interests	3,092
Interest expense, net	(1,037)	(1,882)	(9,661)
Other (expense) income, net	(2,457)	1,596	(991)
Loss before income tax expense	(20,748)	(48,840)	(55,406)
Income tax expense (benefit)	2,391	(184)	852
Net loss	$ (23,139)	$ (48,656)	$ (56,258)
Net loss per common share
Basic	$ (1.76)	$ (5.74)	$ (8.98)
Diluted	$ (1.76)	$ (5.74)	$ (8.98)
Weighted average number of common shares outstanding
Basic	13,178	8,477	6,262
Diluted	13,178	8,477	6,262

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (23,139)	$ (48,656)	$ (56,258)
Other comprehensive gain (loss), net of tax:
Foreign currency translation gains (losses)	968	(2,147)	727
Total other comprehensive gain (loss), net of tax	968	(2,147)	727
Comprehensive loss	$ (22,171)	$ (50,803)	$ (55,531)

- 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 ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at Mar. 31, 2013	$ 125,118	$ 60	$ 924,390	$ (313)	$ 1,112	$ (800,131)
Balance, shares at Mar. 31, 2013		6,030
Issuance of common stock - ESPP	168		168
Issuance of common stock - ESPP, shares		10
Issuance of common stock - restricted shares	502	$ 2	500
Issuance of common stock - restricted shares, shares		178
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
Issuance of common stock-ATM, net of costs	7,458	$ 5	7,453
Issuance of common stock-ATM, net of costs, shares		487
Issuance of common stock to settle liabilities	23,480	$ 12	23,468
Issuance of common stock to settle liabilities, shares, other		1,167
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
Issuance of common stock - ESPP	124		124
Issuance of common stock - ESPP, shares		17
Issuance of common stock - restricted shares		$ 3	(3)
Issuance of common stock - restricted shares, shares		301
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
Issuance of common stock-ATM, net of costs	5,839	$ 4	5,835
Issuance of common stock-ATM, net of costs, shares		375
Issuance of common stock-Hudson Bay Capital	5,225	$ 9	5,216
Issuance of common stock-Hudson Bay Capital, shares		909
Issuance of common stock to settle liabilities	1,323	$ 1	1,322
Issuance of common stock to settle liabilities, shares, other		94
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
Issuance of common stock - ESPP	30		30
Issuance of common stock - ESPP, shares		8
Issuance of common stock - restricted shares		$ 4	(4)
Issuance of common stock - restricted shares, shares		409
Stock-based compensation expense	3,248		3,248
Issuance of stock for 401(k) match	377	$ 1	376
Issuance of stock for 401(k) match, shares		66
Issuance of common stock-equity offering	22,282	$ 40	22,242
Issuance of common stock-equity offering, shares		4,000
Repurchase of treasury stock	(110)			(110)
Cumulative translation adjustment	968				968
Net loss	(23,139)					(23,139)
Balance at Mar. 31, 2016	$ 83,549	$ 141	$ 1,011,813	$ (881)	$ 660	$ (928,184)
Balance, shares at Mar. 31, 2016		14,107

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (23,139)	$ (48,656)	$ (56,258)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	7,972	9,554	10,615
Stock-based compensation expense	3,248	5,936	10,696
Impairment of minority interest investments	746	3,464	1,265
Provision for excess and obsolete inventory	2,713	1,386	316
Write-off prepaid taxes	289		1,426
Gain on sale from minority interest investments	(3,092)
Loss from minority interest investments	356	743	1,008
Change in fair value of derivatives and warrants	228	(3,963)	(1,872)
Loss on extinguishment of debt			5,197
Reversal of Catlin legal costs		(2,220)
Non-cash interest expense	359	566	7,713
Other non-cash items	1,462	(2,436)	1,980
Changes in operating asset and liability accounts:
Accounts receivable	(9,318)	(2,677)	11,379
Inventory	(782)	(1,887)	13,043
Prepaid expenses and other current assets	5,608	(2,330)	12,512
Accounts payable and accrued expenses	1,543	5,579	(10,861)
Deferred revenue	7,248	4,265	(21,426)
Net cash used in operating activities	(4,559)	(32,676)	(13,267)
Cash flows from investing activities:
Purchase of property, plant and equipment	(1,201)	(737)	(278)
Proceeds from the sale of property, plant and equipment	47	18	54
Change in restricted cash	2,669	2,248	4,669
Proceeds from sale of minority interests	3,092
Change in other assets	266	280	(436)
Net cash provided by investing activities	4,873	1,809	4,009
Cash flows from financing activities:
Employee taxes paid related to net settlement of equity awards	(110)	(401)	(57)
Proceeds from the issuance of debt, net of expenses		1,422	9,842
Repayment of debt	(4,000)	(7,295)	(4,615)
Proceeds from public equity offering, net	22,282	14,933	7,458
Proceeds from exercise of employee stock options and ESPP	30	124	168
Net cash provided by financing activities	18,202	8,783	12,796
Effect of exchange rate changes on cash and cash equivalents	324	(540)	333
Net increase/(decrease) in cash and cash equivalents	18,840	(22,624)	3,871
Cash and cash equivalents at beginning of year	20,490	43,114	39,243
Cash and cash equivalents at end of year	39,330	20,490	43,114
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	1,723	362	864
Issuance of common stock to settle liabilities	377	1,715	24,407
Cash paid for interest	$ 709	$ 1,362	$ 990

Nature of the Business and Operations and Liquidity	12 Months Ended
Nature of the Business and Operations and Liquidity	Mar. 31, 2016
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 (together with its subsidiaries, “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-K. 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 stock 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, 2016, the Company had an accumulated deficit of $928.2 million. In addition, the Company has experienced recurring negative operating cash flows. At March 31, 2016, the Company had cash and cash equivalents of $39.3 million. Cash used in operations for the year ended March 31, 2016 was $4.6 million. From April 1, 2011 through the date of this filing, the Company has reduced its global workforce substantially. The Company has taken actions to consolidate certain business operations to reduce facility costs. As of March 31, 2016, the Company had a global workforce of 369 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. Since April 1, 2012, the Company has generated aggregate cash flows from financing activities of $71.0 million. This amount includes proceeds from an April 2015 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”, and Note 12 “Stockholders’ Equity” 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, 2016. In December 2015, the Company entered into a set of strategic agreements valued at approximately $210.0 million with Inox, which includes a multi-year supply contract pursuant to which the Company will supply electric control systems to Inox Wind Ltd. (“Inox”) and a license agreement allowing Inox to manufacture a limited number of electrical control systems over the next three to four years. After this initial three to four year period, Inox agreed that the Company will continue as Inox’s preferred supplier and Inox will be required to purchase from the Company a majority of its electric control systems requirements for an additional three-year period. During the fourth quarter of fiscal 2015, Inox made the upfront payment of $6.0 million required under the license agreement, but as of the date of this Annual Report it has not made the $2.0 million advance payment required under the supply contract. These agreements are expected to provide a foundation for the business as the Company pursues its longer-term objectives. On October 6, 2015, 100% of the outstanding common stock of Blade Dynamics Limited (“Blade Dynamics”) was acquired by a subsidiary of General Electric Company. After deducting transaction expenses, the Company received net proceeds of $2.8 million from the sale, which was recorded as a gain in the fiscal year ended March 31, 2016. Additionally, under the terms of the purchase agreement, the Company may be entitled to receive up to an additional $1.2 million in proceeds, upon the successful achievement of certain milestones by Blade Dynamics over the next three years. On March 11, 2016, the Company sold 100% of its minority share investment in Tres Amigas LLC (“Tres Amigas”) to an investor for $0.6 million. The Company received $0.3 million according to the terms of the purchase agreement upon closing, which was recorded as a gain during the three months ended March 31, 2016. The final $0.3 million is to be paid when Tres Amigas achieves the earlier of certain agreed-upon financing conditions, which is expected to occur during the first half of fiscal 2016. See Note 15, “Minority Investments”, for further information about such investment. 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 the 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.

Summary of Significant Accounting Policies

12 Months Ended

Mar. 31, 2016

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 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, 2016, Inox, accounted for approximately 84% of the Company’s total receivable balance, with no other customer accounting for greater than 10% of the balance. As of March 31, 2015, Inox, accounted for approximately 56% of the Company’s total receivable balance, with no other customer accounting for greater than 10% of the 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 fiscal years ended March 31, 2016 and 2015, the Company recorded inventory reserves of approximately $2.7 million and $1.4 million, respectively, based on evaluating its ending inventory on hand for excess quantities and obsolescence. For the fiscal years ended March 31, 2016, 2015, and 2014, the Company recorded benefits of $5.0 million, $8.0 million, and $4.3 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.

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 year ended March 31, 2016, the Company recorded an impairment charge of $0.7 million on its investment in Tres Amigas. During the fiscal 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. Both of these minority investments have been sold as of March 31, 2016. 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 were received from these customers during the fiscal year ended March 31, 2014, for past shipments and recorded as revenue. There were no payments received for past shipments in the fiscal years ended March 31, 2016 and 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 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’s license agreements provide either for the payment of contractually determined paid-up front license fees or milestone based payments in consideration for the grant of rights to manufacture and or sell products using our patented technologies or know-how. Some of these agreements provide for the release of the licensee from intellectual property infringements past and future claims. When the Company can determine that it has no further obligations other than the grant of the license and that the Company has fully transferred the technology knowhow, the Company recognizes the revenue under a completed contract model. In other license arrangements, the Company may also agree to provide training services to transfer the technology know-how. In these arrangements 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 its performance and milestones that have been achieved. Costs for these arrangements are expensed as incurred.

In December 2015, the Company entered into a set of strategic agreements valued at approximately $210.0 million with Inox, which includes a multi-year supply contract pursuant to which the Company will supply electric control systems to Inox and a license agreement allowing Inox to manufacture a limited number of electrical control systems over the next three to four years. We determined this license has standalone value to the customer and can be separated from the supply contract. The license agreement includes customer acceptance criteria to demonstrate the know-how to manufacture the electrical control systems has been fully transferred. The Company will defer recognition of the revenue allocable to the license until this acceptance criteria has been met.

In March 2016, the Company entered into a set of agreements to jointly develop an advanced low cost manufacturing process for second generation high temperature superconductor wire with BASF. Under the joint development agreement, the Company’s manufacturing know-how for its Amperium® superconductor wire and BASF's chemical solution deposition production technology will be combined. As part of the agreements, the Company also entered into a royalty-bearing, non-exclusive license under which the Company agreed to provide BASF a specified portion of its second generation (2G) high temperature superconductor (HTS) wire manufacturing technology. The Company determined that the license rights it provides to BASF have standalone value from the ongoing joint development effort. We transferred the license rights to BASF in March 2016 recording $3.0M of license revenue in the fiscal year ended March 31, 2016 as there were no remaining obligations associated with these rights. Any newly developed intellectual property as a result of the joint development will be owned by BASF. Should this development effort be successful, the Company has the right to incorporate this new technology into its manufacturing process on a royalty-free basis. BASF has also agreed to make guaranteed annual payments to the Company through 2017 and has an option to continue the joint development through 2018. The Company will record revenue for the research and development services being provided over the term of the arrangement.

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.

During November 2015, the FASB issued ASU 2015-17, “Balance Sheet Classification of Deferred Taxes”, which simplifies the presentation of deferred income taxes. This ASU requires that deferred tax assets and liabilities be classified as non-current in a statement of financial position. The Company early-adopted ASU 2015-17 effective January 1, 2016 on a prospective basis. Adoption of this ASU resulted in all deferred tax assets and liabilities being presented as non-current in the Consolidated Balance Sheet as of January 1, 2016. No prior periods were retrospectively adjusted.

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 and Chinese subsidiaries 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, 2016 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, 2016 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 fiscal years ended March 31, 2016, 2015, and 2014, common equivalent shares of 1,552,959, 1,567,352, and 643,158, 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 fiscal years ended March 31, 2016, 2015, and 2014 (in thousands except per share amounts):

	Fiscal year ended March 31,
	2016			2015			2014

Numerator:
Net loss	$	(23,139	)	$	(48,656	)	$	(56,258	)
Denominator:
Weighted-average shares of common stock outstanding		13,295			8,559			6,411
Weighted-average shares subject to repurchase		(117	)		(82	)		(149	)
Shares used in per-share calculation ― basic		13,178			8,477			6,262
Shares used in per-share calculation ― diluted		13,178			8,477			6,262
Net loss per share ― basic	$	(1.76	)	$	(5.74	)	$	(8.98	)
Net loss per share ― diluted	$	(1.76	)	$	(5.74	)	$	(8.98	)

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 ($2.3) million, $2.8 million, and ($0.1) million for the fiscal years ended March 31, 2016, 2015 and 2014, 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 Company invests its available cash in 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, 2017 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. 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, and a 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, 2016 and 2015. 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. 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.

Fair Value Measurements

12 Months Ended

Mar. 31, 2016

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 from Level 1 and Level 2 to Level 3 of the fair value measurement hierarchy during the year ended March 31, 2016.

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 on a recurring basis, measured as of March 31, 2016 and 2015 (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, 2016:
Assets:
Cash equivalents	$	16,040	$	16,040	$	-	$	-
Derivative liabilities:
Warrants	$	3,227	$	-	$	-	$	3,227

	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

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

	Warrants
April 1, 2015	$	2,999
Mark to market adjustment		228
Balance at March 31, 2016	$	3,227


	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

Valuation Techniques

Cash Equivalents

Warrants

Warrants were issued in conjunction with a Securities Purchase Agreement (the “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.

- 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, 2016

Receivables [Abstract]

Accounts Receivable

4. Accounts Receivable

Accounts receivable at March 31, 2016 and March 31, 2015 consisted of the following (in thousands):

	March 31,			March 31,
	2016			2015
Accounts receivable (billed)	$	18,089		$	8,946
Accounts receivable (unbilled)		1,229			987
Less: Allowance for doubtful accounts		(54	)		(54	)
Accounts receivable, net	$	19,264		$	9,879

Inventory

12 Months Ended

Mar. 31, 2016

Inventory Disclosure [Abstract]

Inventory

5. Inventory

Inventory at March 31, 2016 and March 31, 2015 consisted of the following (in thousands):

	March 31,		March 31,
	2016		2015
Raw materials	$	9,665	$	9,411
Work-in-process		3,411		2,117
Finished goods		3,215		7,487
Deferred program costs		2,221		1,581
Net inventory	$	18,512	$	20,596

The Company recorded inventory write-downs of $2.7 million and $1.4 million for the fiscal years ended March 31, 2016 and 2015, respectively. These write downs were based on evaluating its inventory on hand for excess quantities and obsolescence.

Deferred program costs as of March 31, 2016 and March 31, 2015 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.

Property, Plant and Equipment

12 Months Ended

Mar. 31, 2016

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, 2016 and 2015 are as follows (in thousands):

	March 31,			March 31,
	2016			2015
Land	$	3,643		$	3,643
Construction in progress - equipment		601			130
Buildings		34,549			34,549
Equipment and software		73,659			81,855
Furniture and fixtures		1,215			1,156
Leasehold improvements		3,600			4,132
Property, plant and equipment, gross		117,267			125,465
Less accumulated depreciation		(67,489	)		(69,368	)
Property, plant and equipment, net	$	49,778		$	56,097

Depreciation expense was $7.4 million, $9.0 million, and $9.9 million, for the fiscal years ended March 31, 2016, 2015, and 2014, respectively. See Note 16, “Restructuring and Impairments,” for additional information regarding the effect the Company’s restructuring plan had on property, plant and equipment.

Intangible Assets

12 Months Ended

Mar. 31, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets

7. Intangible Assets

Intangible assets at March 31, 2016 and 2015 consisted of the following (in thousands):

	2016							2015
	Gross		Accumulated			Net Book		Gross		Accumulated			Net Book		Estimated
	Amount		Amortization			Value		Amount		Amortization			Value		Useful Life
Licenses	$	4,422	$	(3,739	)	$	683	$	4,422	$	(3,328	)	$	1,094	7
Core technology and know-how		5,010		(4,839	)		171		4,858		(4,530	)		328	5-10
Intangible assets	$	9,432	$	(8,578	)	$	854	$	9,280	$	(7,858	)	$	1,422

The Company recorded intangible amortization expense of $0.6 million, $0.6 million, and $0.8 million for the fiscal years ended March 31, 2016, 2015, and 2014, respectively.

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

Fiscal years ending March 31,	Total
2017	$	553
2018		301
Total	$	854

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

	March 31,
	2016		2015
Intangible assets by geography:
U.S.	$	854	$	1,422
Europe		-		-
Total	$	854	$	1,422

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

	March 31,
	2016		2015
Intangible assets by business segments:
Wind	$	-	$	-
Grid		854		1,422
Total	$	854	$	1,422

Accounts Payable and Accrued Expenses

12 Months Ended

Mar. 31, 2016

Payables And Accruals [Abstract]

Accounts Payable and Accrued Expenses

8. Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses at March 31, 2016 and March 31, 2015 consisted of the following (in thousands):

	March 31,		March 31,
	2016		2015
Accounts payable	$	5,837	$	7,062
Accrued inventories in-transit		1,908		1,127
Accrued other miscellaneous expenses		3,003		3,254
Accrued compensation		7,526		5,960
Income taxes payable		1,281		278
Accrued warranty		3,601		3,934
Total	$	23,156	$	21,615

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):

	Fiscal Years Ended March 31,
	2016			2015
Balance at beginning of period	$	3,934		$	3,207
Change in accruals for warranties during the period		1,865			2,839
Settlements during the period		(2,198	)		(2,112	)
Balance at end of period	$	3,601		$	3,934

Debt	12 Months Ended
Debt	Mar. 31, 2016
Debt Disclosure [Abstract]
Debt	9. Debt Senior Secured Term Loans On November 15, 2013, the Company amended its existing Loan and Security Agreement with Hercules, and entered into a term loan (the “Term Loan B”), borrowing $10.0 million. After closing fees and expenses, the net proceeds to the Company for the Term Loan B were $9.8 million. The Term Loan B bears an interest rate of 11% plus the percentage, if any, by which the prime rate as reported by the Wall Street Journal exceeds 3.75%. The Company is repaying the Term Loan B in equal monthly installments ending on November 1, 2016. The principal balance of the Term Loan B is approximately $2.7 million as of March 31, 2016. The Company will pay an end of term fee of $0.5 million upon the earlier of maturity or prepayment of the Term Loan B. The Company has accrued the end of term fee and recorded a corresponding amount into the debt discount. The 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 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 three months ended December 31, 2013, which have been recorded as a debt discount. On December 19, 2014, the Company entered into a second amendment with Hercules (the “Hercules Second Amendment”) and entered into a new term loan, borrowing an additional $1.5 million (the “Term Loan C”). After closing fees and expenses, the net proceeds to the Company for the Term Loan C were $1.4 million. The Term Loan B and Term Loan C are collectively referred to as the “Term Loans”. The Term Loan C also bears the same interest rate as the Term Loan B. The Company will make interest only payments until maturity on June 1, 2017, when the loan is scheduled to be repaid in its entirety. The maturity date of the Term Loan C was extended from March 1, 2017 to June 1, 2017 due to the Company’s April 2015 equity offering which raised more than $10 million in new capital before December 31, 2015. The Company will pay an end of term fee of approximately $0.1 million upon earlier of maturity or prepayment of the Term Loan C. The Company has accrued the end of term fee and recorded a corresponding amount in the debt discount. The Term Loan C includes the same mandatory prepayment feature as the 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. Hercules received warrants to purchase 13,927 shares of common stock (the “First Warrant”) and 25,641 shares of common stock (the “Second Warrant”) in conjunction with a prior term loan which has been repaid in full and the Term Loan B. Due to certain adjustment provisions within the warrants, they qualified for liability accounting and the fair value of the warrants $0.4 million and $0.2 million respectively was recorded upon issuance to debt discount and a warrant liability. In conjunction with the Hercules Second Amendment, the First Warrant and Second Warrant were cancelled and replaced with the issuance of a new warrant (the “Hercules Warrant”) to purchase 58,823 shares of common stock at an exercise price of $11.00 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. Under Term Loan B, the total debt discount including the 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 Term Loan B using the effective interest method. During the years ended March 31, 2016 and 2015, the Company recorded non-cash interest expense for amortization of the debt discount related to the Term Loan B of $0.2 million and $0.4 million, respectively. Under Term Loan C, 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 Term Loan C using the effective interest method. During each of the fiscal years ended March 31, 2016 and 2015, the Company recorded non-cash interest expense for amortization of the debt discount related to the Term Loan C of $0.1 million, and less than $0.1 million, respectively. 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 guarantees 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 a result of the Company’s April 2015 equity offering, the Minimum Threshold was reduced to the lesser of $2.0 million or the aggregate outstanding principal balance of the Term Loans. As of March 31, 2016, the Minimum Threshold was $2.0 million. 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 it is in compliance with the covenants and restrictions under the Term Loans as of March 31, 2016, there can be no assurance that the Company will continue to be in compliance. Senior Convertible Note On April 4, 2012, the Company entered into a Purchase Agreement with CVI and completed a private placement of a senior convertible note (the “Note”). After fees and expenses, the net proceeds of the Note were $23.2 million. On March 2, 2014 the Note was extinguished for approximately 663,000 shares of common stock. 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. During the year ended March 31, 2014 the Company recorded non-cash interest expense for the amortization of the debt discount related to the Note of $4.1 million. In conjunction with the Note, CVI received a warrant to purchase 309,406 shares of common stock. Due to certain adjustment provisions within the warrant it qualified for liability accounting. See Note 10, “Warrants and Derivative Liabilities”, for a discussion on the Warrant and the valuation assumptions used. Interest expense on the Note and Term Loans for the fiscal years ended March 31, 2016, 2015 and 2014, was $1.0 million, $1.7 million and $9.7 million, respectively, which included $0.4 million, $0.5 million and $7.7 million, respectively, of non-cash interest expense related to the amortization of the debt discount and payment of the Note in Company common stock at a discount.

Warrants and Derivative Liabilities

12 Months Ended

Mar. 31, 2016

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 a warrant to purchase 309,406 shares of the Company’s common stock (the “Original Warrant”). Pursuant to an exchange in October 2013, the Original warrant was exchanged for a new warrant (the “Exchanged Warrant”). The Exchanged Warrant is exercisable at any time on or after the date that is six months after the issuance of the Original Warrant and entitles CVI to purchase shares of the Company’s common stock for a period of five years from the date the Original Warrant becomes exercisable at an exercise price equal to $15.94 per share, subject to certain price-based and other anti-dilution adjustments. 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 warrant, 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. See Note 3, “Fair Value Measurements” for further discussion

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 is 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 Exchanged Warrant:

	March 31,			December 31,			September 30,			June 30,
Fiscal Year 15	2016			2015			2015			2015

Risk-free interest rate		0.66	%		0.96	%		0.64	%		0.74	%
Expected annual dividend yield		—	%		—	%		—	%		—	%
Expected volatility		76.76	%		76.68	%		73.39	%		71.61	%
Term (years)	1.51			1.76			2.01			2.26
Fair value	$0.4 million			$0.3 million			$0.1 million			$0.2 million

	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,			March 31,
Fiscal Year 13	2014			2013			2013			2013			2013			2013			2013

Risk-free interest rate		1.11	%		1.17	%		1.05	%		1.05	%		1.02	%		1.13	%		0.67	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%		—	%		—	%
Expected volatility		80.99	%		75.60	%		71.45	%		71.45	%		71.98	%		71.90	%		71.74	%
Term (years)	3.51			3.76			3.99			3.99				4.01			4.27			4.51
Fair value	$ 2.2 million			$ 2.2 million			$ 3.2 million			$ 2.2 million			$ 2.5 million			$ 3.0 million			$ 3.4 million

The Company recorded a net loss, resulting from an increase in the fair value of the Exchanged Warrant, of $0.1 million, and a net gain, resulting from a decrease in the fair value of the Exchanged Warrant, of $1.9 million and $1.2 million to change in fair value of derivatives and warrants in the fiscal years ended March 31, 2016, 2015 and 2014 respectively.

Hercules Warrant

On December 19, 2014, the Company entered into the Hercules Second Amendment, (see Note 10, “Debt” for additional information). In conjunction with the agreement, the Company issued the Hercules Warrant to purchase 58,823 shares of the Company’s common stock. The Hercules Warrant is exercisable at any time after its issuance at an initial exercise price of $11.00 per share, subject to certain price-based and other anti-dilution adjustments, and expires on June 30, 2020. As a result of the equity offering in April 2015, the exercise price of the Hercules Warrant was reduced to $9.41 per share.

The Company accounts for the Hercules Warrant as a liability due to certain provisions within the warrant. The Hercules Warrant is subject to revaluation at each balance sheet date and any change in fair value is 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 Hercules Warrant:

	March 31,			December 31,			September 30,			June 30,
Fiscal Year 15	2016			2015			2015			2015

Risk-free interest rate		1.08	%		1.65	%		1.31	%		1.63	%
Expected annual dividend yield		—	%		—	%		—	%		—	%
Expected volatility		70.25	%		73.57	%		75.32	%		72.57	%
Term (years)		4.25			4.50			4.75			5.00
Fair value	$0.2 million			$0.2 million			$0.1 million			$0.2 million

							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 Hercules Warrant in the fiscal years ended March 31, 2016, and 2015.

November 2014 Warrant

On November 13, 2014, the Company completed an offering of approximately 909,090 units of the Company’s common stock with Hudson Bay Capital. Each unit consisted of one share of the Company’s common stock and 0.9 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 an initial exercise price equal to $11.00 per share, subject to certain price-based and other anti-dilution adjustments, and expires on November 13, 2019. As a result of the April 2015 equity offering, the exercise price of the November 2014 Warrant was reduced to $9.41 per share.

The Company accounts for the November 2014 Warrant as a liability due to certain provisions within the warrant. The November 2014 Warrant is subject to revaluation at each balance sheet date and any change in fair value is 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:

	March 31,			December 31,			September 30,			June 30,
Fiscal Year 15	2016			2015			2015			2015

Risk-free interest rate		0.98	%		1.51	%		1.17	%		1.44	%
Expected annual dividend yield		—	%		—	%		—	%		—	%
Expected volatility		69.88	%		70.02	%		73.02	%		74.18	%
Term (years)		3.62			3.87			4.12			4.37
Fair value	$2.6 million			$2.1 million			$1.3 million			$1.8 million

							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 net loss, resulting from an increase in the fair value of the November 2014 Warrant, of $0.1 million, and a net gain, resulting from a decrease in the fair value of the November 2014 Warrant, of $1.8 million to change in fair value of derivatives and warrants in the fiscal years ended March 31, 2016, and 2015, respectively.

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, the Term Loans, and the November 2014 Warrant utilizing the respective terms of the warrants with similar inputs, as described above.

- 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.

+ References

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+ Details

Income Taxes

12 Months Ended

Mar. 31, 2016

Income Tax Disclosure [Abstract]

Income Taxes

11. Income Taxes

Income (loss) before income taxes for the fiscal years ended March 31, 2016, 2015, and 2014 are provided in the table as follows (in thousands):

	Fiscal years ended March 31,
	2016			2015			2014
Income (loss) before income tax expense:
U.S.	$	(29,436	)	$	(40,277	)	$	(91,558	)
Foreign		8,688			(8,563	)		36,152
Total	$	(20,748	)	$	(48,840	)	$	(55,406	)

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

	Fiscal years ended March 31,
	2016			2015			2014
Current
Federal	$	459		$	47		$	287
State		-			-			-
Foreign		1,950			(274	)		614
Total current		2,409			(227	)		901

Deferred
Federal		(18	)		43			(49	)
State		-			-			-
Foreign		-			-			-
Total deferred		(18	)		43			(49	)

Income tax (benefit) expense	$	2,391		$	(184	)	$	852

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

	Fiscal years ended March 31,
	2016				2015			2014
Statutory federal income tax rate		(34	)	%	(34	)	%	(34	)	%
State income taxes, net of federal benefit		1			2			-
Deemed dividend and dividends paid		5			1			1
Foreign income tax rate differential		5			6			(6	)
Stock options		1			1			2
Nondeductible expenses		-			1			1
Research and development tax credit		(5	)		-			-
Deferred warrants		-			(3	)		(1	)
Interest expense		-			-			5
Extinguishment of debt		-			-			3
Reversal of uncertain tax benefits		-			(6	)		-
True-up of foreign NOLs		19			-			-
Settlement of intercompany balances		(9	)		-			-
Nondeductible foreign currency exchange remeasurement loss		10			-			-
Valuation allowance		18			32			30
Effective income tax rate		11		%	-		%	1		%

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

	March 31,			March 31,
	2016			2015
Deferred tax assets:
Net operating loss carryforwards	$	281,098		$	272,498
Research and development and other tax credit carryforwards		11,878			10,655
Accruals and reserves		28,088			37,153
Fixed assets and intangible assets		2,393			2,432
Other		14,494			18,514
Gross deferred tax assets		337,951			341,252
Valuation allowance		(301,393	)		(294,860	)
Total deferred tax assets		36,558			46,392

Deferred tax liabilities:
Intercompany debt		(27,117	)		(36,298	)
Other		(9,408	)		(10,174	)
Total deferred tax liabilities		(36,525	)		(46,472	)
Net deferred tax asset (liability)	$	33		$	(80	)

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 $13.0 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, 2016, the Company had aggregate net operating loss carryforwards in the U.S. for federal and state income tax purposes of approximately $791.0 million and $177.0 million, respectively, which expire in the years ending March 31, 2017 through 2036. Included in the U.S. net operating loss is $3.7 million of acquired losses from Power Quality Systems, Inc. and $52.5 million from excess tax deductions from stock options exercised in the years ending March 31, 2006 through 2016. 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 $9.3 million and $2.9 million are available to offset federal and state income taxes, respectively, and will expire in the years ending March 31, 2017 through 2036.

At March 31, 2016, the Company had aggregate net operating loss carryforwards for its Austrian subsidiary, AMSC Austria GmbH, of approximately $42.6 million which can be carried forward indefinitely subject to certain annual limitations. At March 31, 2016, the Company had aggregate net operating loss carryforwards for its Chinese operation of approximately $32.0 million, which can be carried forward for five years and begin to expire December 31, 2016. At March 31, 2016, the Company had aggregate net operating loss carryforwards from Romania of $0.5 million, which can be carried forward through March 31, 2023. 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 conducted a study as a result of the April 2015 equity offering to determine whether Section 382 could limit the use of its carryforwards in this manner. After completing this study, the Company has concluded that the limitation will not 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 and Chinese subsidiaries 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, 2016 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, 2016 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, 2016. The Company did not have any gross unrecognized tax benefits at March 31, 2016 or 2015.

During the fiscal year ended March 31, 2015, the Company concluded a 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 material exceptions to the Company’s tax positions.

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

Balance at March 31, 2014	$	1,061
Reversal of uncertain tax positions		(1,061	)
Balance at March 31, 2015	$	-
Reversal of uncertain tax positions		-
Balance at March 31, 2016	$	-

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 recorded in prior periods were immaterial 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, Romania and Austria. All U.S. income tax filings for fiscal years ended March 31, 1995 through 2016 remain open and subject to examination and all fiscal years from the year ended March 31, 2012 through 2016 remain open and subject to examination in Austria. The Company’s tax filings in China for calendar years 2013 and 2014 are currently being examined. Tax filings in China for calendar years 2008 through 2012 remain open and subject to examination. Tax filings in Romania for the years ended March 31, 2014 through 2016 remain open and subject to examination.

Stockholders' Equity

12 Months Ended

Mar. 31, 2016

Equity [Abstract]

Stockholders' Equity

12. Stockholders’ Equity

Stock-Based Compensation

The components of employee stock-based compensation for the years ended March 31, 2016, 2015 and 2014 were as follows (in thousands):

	Fiscal years ended March 31,
	2016		2015		2014
Stock options	$	663	$	1,851	$	2,730
Restricted stock and stock awards		2,574		4,063		7,936
Employee stock purchase plan		11		22		30
Total stock-based compensation expense	$	3,248	$	5,936	$	10,696

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 $0.6 million for the fiscal year ended March 31, 2016. This expense will be recognized over a weighted-average expense period of approximately 2.4 years. The total unrecognized compensation cost for unvested outstanding restricted stock was $2.6 million for the fiscal year ended March 31, 2016. This expense will be recognized over a weighted-average expense period of approximately 1.8 years.

The following table summarizes employee stock-based compensation expense by financial statement line item for the fiscal years ended March 31, 2016, 2015 and 2014 (in thousands):

	Fiscal years ended March 31,
	2016		2015		2014
Cost of revenues	$	274	$	719	$	1,002
Research and development		418		1,728		2,751
Selling, general and administrative		2,556		3,489		6,943
Total	$	3,248	$	5,936	$	10,696

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

						Weighted-
				Weighted-		Average
				Average		Remaining		Aggregate
				Exercise		Contractual		Intrinsic Value
	Options / Shares			Price		Term		(thousands)
Outstanding at March 31, 2015		380,940		$	84.57
Granted		-
Exercised		-
Cancelled/forfeited		(14,391	)		115.35
Outstanding at March 31, 2016		366,549		$	83.39		5.7	$	-
Exercisable at March 31, 2016		261,656		$	110.06		4.8	$	-
Fully vested and expected to vest at March 31, 2016		357,776		$	85.07		5.6	$	-

There were no stock options granted during the fiscal year ended March 31, 2016. The weighted-average grant-date fair value of stock options granted during the fiscal years ended March 31, 2015 and 2014 was per share, $10.18 per share, and $16.20 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, 2016, 2015 and 2014 had no intrinsic value.

The weighted average assumptions used in the Black-Scholes valuation model for stock options granted during the fiscal years ended March 31, 2016, 2015, and 2014 are as follows:

	Fiscal years ended March 31,
	2016	2015			2014
Expected volatility	N/A		85.5	%		75.1	%
Risk-free interest rate	N/A		1.9	%		1.7	%
Expected life (years)	N/A		5.8			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, 2016:

				Weighted		Intrinsic
				Average		Aggregate
				Grant Date		Value
	Shares			Fair Value		(thousands)
Outstanding at March 31, 2015		340,588		$	20.82
Granted		420,189			6.24
Vested		(262,984	)		14.56
Forfeited		(14,949	)		76.22
Outstanding at March 31, 2016		482,844		$	9.62	$	3,670

The total fair value of restricted stock that was granted during the fiscal years ended March 31, 2016, 2015 and 2014 was $2.6 million, $5.6 million, and $4.5 million, which includes $0.5 million for bonus and severance, respectively. The total fair value of restricted stock that vested during the fiscal years ended March 31, 2016, 2015 and 2014 was $1.7 million, $3.1 million, $3.7 million, which includes $0.5 million for bonus and severance, respectively.

There were no performance-based restricted stock shares awarded during the fiscal year ended March 31, 2016. The restricted stock awarded during the fiscal years ended March 31, 2015 and 2014 includes approximately 38,021, and 40,201 shares, respectively, of performance-based restricted stock, which would vest upon achievement of certain financial performance measurements. Included in the table above are 6,666 shares of restricted stock units outstanding.

The remaining shares awarded 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, 2016, 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 Plan replaced the Company’s 2004 Stock Incentive Plan upon the approval by the Company’s stockholders on August 3, 2007. The 2007 Director 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, 2016, 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, 2016, the 2007 Plan had 195,194 shares and the 2007 Director Plan had 35,505 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 less than $0.1 million during the year fiscal ended March 31, 2016 and $0.1 million for each of the fiscal years ended March 31, 2015 and 2014, respectively, related to the ESPP. As of March 31, 2016 the ESPP had no shares available for future issuance.

Equity Offerings

On April 29, 2015, the Company completed an equity offering with Cowen and Company, LLC, under which the Company sold 4.0 million shares of its common stock at an offering price of $6.00 per share. After underwriting, commissions and expenses, the Company received net proceeds from the offering of approximately $22.3 million.

- 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 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 2
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Subparagraph (SAB TOPIC 4.C)
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.3-04)
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

+ Details

Commitments and Contingencies

12 Months Ended

Mar. 31, 2016

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

13. Commitments and Contingencies

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.

Lease Commitments

Operating leases include minimum payments under leases for the Company’s facilities and certain equipment. 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 183,000 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. See Item 2, “Properties” for further information.

Minimum future lease commitments at March 31, 2016 were as follows (in thousands):

Fiscal years ended March 31,	Total
2017	$	1,135
2018		469
2019		252
2020		176
2021		165
Thereafter		-
Total	$	2,197

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


	Fiscal years ended March 31,
	2016		2015		2014
Rent expense	$	1,628	$	2,091	$	2,152

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 to the extent necessary to make the consolidated financial statements not misleading. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in its consolidated financial statements.

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 this agreement, the Company reversed a portion of the accrued arbitration liability and recorded a gain 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.

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. The Company alleges that Sinovel committed various material breaches of its contracts with the Company and 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 (approximately $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 (approximately $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 1.2 billion (approximately $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 claims, 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 (approximately $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 still in the early technical review phase, the Company cannot reasonably estimate possible losses or range of losses at this time.

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, 2016, the Company had $0.5 million of restricted cash included in current assets and $0.9 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.

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Mar. 31, 2016
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, for each of the fiscal years ended March 31, 2016, 2015, and 2014, and recorded corresponding charges to additional paid-in capital related to this program.

Minority Investments	12 Months Ended
Minority Investments	Mar. 31, 2016
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. During the three months ended June 30, 2015, the Company determined that as a result of delays in Tres Amigas securing financing for the project, as well as the Company’s expectation that its investment would not be recoverable based on recent adverse market indicators for potential sales of the Company’s share of the investment, that its investment in Tres Amigas required further analysis for other-than-temporary impairment. The Company recorded an impairment charge of $0.7 million to fully impair this investment in the fiscal year ended March 31, 2016. On March 11, 2016, the Company sold 100% of its minority share investment in Tres Amigas to an investor for $0.6 million. The Company received $0.3 million according to the terms of the purchase agreement upon closing, which was recorded as a gain during the three months ended March 31, 2016. The final $0.3 million is to be paid when Tres Amigas achieves the earlier of certain agreed-upon financing conditions which is expected to occur during the first half of fiscal 2016. Investment in Blade Dynamics Ltd. The Company 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. During the year ended March 31, 2015, the Company determined that its investment was no longer recoverable and therefore recorded an impairment charge of $3.5 million. On October 6, 2015, 100% of the outstanding common stock of Blade Dynamics was acquired by a subsidiary of General Electric Company. After deducting transaction expenses, AMSC received net proceeds of $2.8 million from the sale, which was recorded as a gain during the fiscal year ended March 31, 2016. Additionally, under the terms of the purchase agreement, AMSC may be entitled to receive up to an additional $1.2 million in proceeds upon the successful achievement of certain milestones by Blade Dynamics over the next three years.

Restructuring

12 Months Ended

Mar. 31, 2016

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 fiscal years ended March 31, 2015 and 2014, 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 into 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. The Company is maintaining its headcount in China at a level necessary to support demand from its Chinese customers. The Company recorded restructuring charges for severance and other costs of approximately less than $0.1 million, $1.9 million and $1.7 million during the fiscal years ended March 31, 2016, 2015 and 2014, respectively, primarily associated with the consolidation of the Company’s manufacturing activities in the United States and China. From April 1, 2011 through March 31, 2016, the Company’s various restructuring activities resulted in a substantial reduction of its global workforce. All amounts related to these restructuring activities have been paid as of March 31, 2016.

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, 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
Charges to operations		(5	)		38			33
Cash payments		(175	)		(38	)		(213	)
Accrued restructuring balance at March 31, 2016	$	-		$	-		$	-

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.

Business Segments

12 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Business Segments

17. Business Segments

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):

	Fiscal Years Ended March 31,
	2016		2015		2014
Revenues:
Wind	$	68,883	$	51,307	$	55,608
Grid		27,140		19,223		28,509
Total	$	96,023	$	70,530	$	84,117

	Fiscal Years Ended March 31,
	2016			2015			2014
Operating loss:
Wind	$	(1,256	)	$	(14,321	)	$	(5,213	)
Grid		(14,835	)		(26,890	)		(22,523	)
Unallocated corporate expenses		(4,027	)		(11,306	)		(13,693	)
Total	$	(20,118	)	$	(52,517	)	$	(41,429	)

Total assets for the two business segments as of March 31, 2016 and March 31, 2015 are as follows (in thousands):

	March 31,		March 31,
	2016		2015
Wind	$	34,389	$	41,947
Grid		36,255		42,482
Corporate assets		64,674		49,396
Total	$	135,318	$	133,825

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. 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 loss.

Unallocated corporate expenses primarily consist of stock-based compensation expense of $3.2 million, $5.9 million and $10.7 million in the fiscal years ended March 31, 2016, 2015, and 2014, respectively, and restructuring and impairment charges of $0.8 million, $5.4 million, and $3.0 million for the fiscal years ended March 31, 2016, 2015 and 2014, respectively.

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

	Fiscal years ended March 31,
	2016		2015		2014
India	$	59,640	$	39,314	$	26,384
U.S.		14,565		9,820		11,013
China		8,455		10,410		24,748
Asia Pacific		5,364		3,788		8,223
Africa		2,697		616		2,187
Australia		2,410		1,653		3,037
Europe		1,775		2,239		5,213
Canada		1,117		2,690		3,312
Total	$	96,023	$	70,530	$	84,117

In the fiscal years ended March 31, 2016, 2015 and 2014, 85%, 86%, and 87% of the Company’s revenues, respectively, were recognized from sales outside the United States. The Company maintains operations in Austria, Romania, China and the United States and sales and service support centers around the world.

In the fiscal years ended March 31, 2016 and 2015, Inox accounted for approximately 62% and 56% of the Company’s total revenues, respectively. In the year ended March 31, 2014, Inox and Beijing JINGCHENG New Energy accounted for approximately 31% and 18%, 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,
	2016		2015
North America	$	48,685	$	54,673
Europe		868		854
Asia Pacific		225		570
Total	$	49,778	$	56,097

- 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
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599

+ Details

Quarterly Financial Data

12 Months Ended

Mar. 31, 2016

Quarterly Financial Data [Abstract]

Quarterly Financial Data

18. Quarterly Financial Data (Unaudited)

(In thousands, except per share amount)	For the year ended March 31, 2016:
Three Months Ended	June 30,			September 30,			December 31,			March 31,
	2015			2015			2015			2016
Total revenue	$	23,723		$	19,004		$	25,772		$	27,524
Operating loss		(8,257	)		(6,841	)		(3,312	)		(1,708	)
Net loss		(9,121	)		(7,698	)		(2,957	)		(3,363	)
Net loss per common share—basic		(0.75	)		(0.57	)		(0.22	)		(0.25	)
Net loss per common share—diluted		(0.75	)		(0.57	)		(0.22	)		(0.25	)

	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	)

Recent Accounting Pronouncements	12 Months Ended
Recent Accounting Pronouncements	Mar. 31, 2016
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, 2017. The Company is currently evaluating the impact, if any, the adoption of ASU 2014-09 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, if any, the adoption of ASU 2014-12 may have on its current practices. 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, if any, the adoption of ASU 2014-15 may have on its current practices. 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, if any, the adoption of ASU 2015-03 may have on its current practices, and currently does not believe there will be an impact on its consolidated results of operations, financial condition, or cash flow. In June 2015, the FASB issued ASU 2015-10 Technical Corrections and Improvements. The amendments in ASU 2015-10 clarify and correct some of the differences that arose between original guidance from FASB, EITF and other sources, and the translation into the new Codification. 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, if any, the adoption of ASU 2015-10 may have on its current practices, and currently does not believe there will be an impact on its consolidated results of operations, financial condition, or cash flow. In July 2015, the FASB issued ASU 2015-11 Inventory (Topic 330): Simplifying the Measurement of Inventory. The amendments in ASU 2015-11 clarify the proper way to identify market value in the use of lower of cost or market value valuation method. As market value could be determined multiple ways under prior standards, it will now be considered as net realizable value. This ASU is effective for annual reporting periods beginning after December 15, 2016, and interim periods within those fiscal years. The Company is currently evaluating the impact, if any, the adoption of ASU 2015-11 may have on its current practices. In September 2015, the FASB issued ASU 2015-16 Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments. The amendments in ASU 2015-16 require that an acquirer recognize adjustments to provisional amounts identified during the measurement period in the reporting period in which the adjustment amounts are determined. 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, if any, the adoption of ASU 2015-16 may have on its current practices, and currently does not believe there will be an impact on its consolidated results of operations, financial condition, or cash flow. In November 2015, the FASB issued ASU 2015-17 Balance Sheet Classification of Deferred Taxes. This ASU simplifies the presentation of deferred income taxes and requires that deferred tax assets and liabilities be classified as non-current in a statement of financial position. The Company early-adopted ASU 2015-17 effective January 1, 2016 on a prospective basis. Adoption of this ASU resulted in all deferred tax assets and liabilities being presented as non-current in the Consolidated Balance Sheet as of January 1, 2016. No prior periods were retrospectively adjusted. In January 2016, the FASB issued ASU 2016-01 Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments in ASU 2016-01 will enhance the reporting model for financial instruments to provide users of financial statements with more decision-useful information. This ASU is effective for annual reporting periods beginning after December 15, 2017, and interim periods within those fiscal years. The Company is currently evaluating the impact, if any, the adoption of ASU 2016-01 may have on its current practices. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The guidance in this ASU supersedes the leasing guidance in Topic 840, Leases. Under the new guidance, lessees are required to recognize lease assets and lease liabilities on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. This ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. The Company is currently evaluating the effects adoption of this guidance will have on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-08 Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net). The amendments in ASU 2016-08 clarify the implementation guidance on principal versus agent consideration. The ASU is effective for annual reporting periods beginning after December 15, 2017. The Company is currently evaluating the impact, if any, the adoption of ASU 2016-08 may have on its current practices. In March 2016, the FASB issued ASU 2016-09 Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The amendments in ASU 2016-09 will simplify several aspects of the accounting for share-based payment transactions, including tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The ASU is effective for annual reporting periods beginning after December 15, 2017, and interim periods within annual periods beginning after December 15, 2018. The Company is currently evaluating the impact, if any, the adoption of ASU 2016-09 may have on its current practices. In April 2016, the FASB issued ASU 2016-10 Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing. The amendments in ASU 2016-10 will clarify the identification of performance obligations and the licensing implementation guidance. The ASU is effective for annual reporting periods beginning after December 15, 2017. The Company is currently evaluating the impact, if any, the adoption of ASU 2016-10 may have on its current practices.

- 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 FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22583-107794

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22580-107794

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22499-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305

+ Details

Valuation and Qualifying Accounts

12 Months Ended

Mar. 31, 2016

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, 2016	$	54		-		-			-	$	54
Fiscal year ended March 31, 2015	$	16		54		(16	)		-	$	54
Fiscal year ended March 31, 2014	$	-		16		-			-	$	16

	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, 2016	$	294,860		9,028		(2,495	)		-	$	301,393
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

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Mar. 31, 2016

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

	Fiscal year ended March 31,
	2016			2015			2014

Numerator:
Net loss	$	(23,139	)	$	(48,656	)	$	(56,258	)
Denominator:
Weighted-average shares of common stock outstanding		13,295			8,559			6,411
Weighted-average shares subject to repurchase		(117	)		(82	)		(149	)
Shares used in per-share calculation ― basic		13,178			8,477			6,262
Shares used in per-share calculation ― diluted		13,178			8,477			6,262
Net loss per share ― basic	$	(1.76	)	$	(5.74	)	$	(8.98	)
Net loss per share ― diluted	$	(1.76	)	$	(5.74	)	$	(8.98	)

Foreign Currency Translation

Risks and Uncertainties

Contingencies

Debt

Disclosure of Fair Value of Financial Instruments

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2016

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 fiscal years ended March 31, 2016, 2015, and 2014 (in thousands except per share amounts):

	Fiscal year ended March 31,
	2016			2015			2014

Numerator:
Net loss	$	(23,139	)	$	(48,656	)	$	(56,258	)
Denominator:
Weighted-average shares of common stock outstanding		13,295			8,559			6,411
Weighted-average shares subject to repurchase		(117	)		(82	)		(149	)
Shares used in per-share calculation ― basic		13,178			8,477			6,262
Shares used in per-share calculation ― diluted		13,178			8,477			6,262
Net loss per share ― basic	$	(1.76	)	$	(5.74	)	$	(8.98	)
Net loss per share ― diluted	$	(1.76	)	$	(5.74	)	$	(8.98	)

Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Carried at Fair Value on Recurring Basis

The following table provides the assets and liabilities carried at fair value on a recurring basis, measured as of March 31, 2016 and 2015 (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, 2016:
Assets:
Cash equivalents	$	16,040	$	16,040	$	-	$	-
Derivative liabilities:
Warrants	$	3,227	$	-	$	-	$	3,227

	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

Schedule of Liabilities Measured at Fair Value on Recurring Basis

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

	Warrants
April 1, 2015	$	2,999
Mark to market adjustment		228
Balance at March 31, 2016	$	3,227


	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

Accounts Receivable (Tables)

12 Months Ended

Mar. 31, 2016

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable at March 31, 2016 and March 31, 2015 consisted of the following (in thousands):

	March 31,			March 31,
	2016			2015
Accounts receivable (billed)	$	18,089		$	8,946
Accounts receivable (unbilled)		1,229			987
Less: Allowance for doubtful accounts		(54	)		(54	)
Accounts receivable, net	$	19,264		$	9,879

Inventory (Tables)

12 Months Ended

Mar. 31, 2016

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventory at March 31, 2016 and March 31, 2015 consisted of the following (in thousands):

	March 31,		March 31,
	2016		2015
Raw materials	$	9,665	$	9,411
Work-in-process		3,411		2,117
Finished goods		3,215		7,487
Deferred program costs		2,221		1,581
Net inventory	$	18,512	$	20,596

Property, Plant and Equipment (Tables)

12 Months Ended

Mar. 31, 2016

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, 2016 and 2015 are as follows (in thousands):

	March 31,			March 31,
	2016			2015
Land	$	3,643		$	3,643
Construction in progress - equipment		601			130
Buildings		34,549			34,549
Equipment and software		73,659			81,855
Furniture and fixtures		1,215			1,156
Leasehold improvements		3,600			4,132
Property, plant and equipment, gross		117,267			125,465
Less accumulated depreciation		(67,489	)		(69,368	)
Property, plant and equipment, net	$	49,778		$	56,097

Intangible Assets (Tables)

12 Months Ended

Mar. 31, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

Intangible assets at March 31, 2016 and 2015 consisted of the following (in thousands):

	2016							2015
	Gross		Accumulated			Net Book		Gross		Accumulated			Net Book		Estimated
	Amount		Amortization			Value		Amount		Amortization			Value		Useful Life
Licenses	$	4,422	$	(3,739	)	$	683	$	4,422	$	(3,328	)	$	1,094	7
Core technology and know-how		5,010		(4,839	)		171		4,858		(4,530	)		328	5-10
Intangible assets	$	9,432	$	(8,578	)	$	854	$	9,280	$	(7,858	)	$	1,422

Schedule of Expected Future Amortization Expense

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

Fiscal years ending March 31,	Total
2017	$	553
2018		301
Total	$	854

Schedule of Geographic Composition of Goodwill And Intangible Assets

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

	March 31,
	2016		2015
Intangible assets by geography:
U.S.	$	854	$	1,422
Europe		-		-
Total	$	854	$	1,422

Schedule of Business Segment Composition of Intangible Assets

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

	March 31,
	2016		2015
Intangible assets by business segments:
Wind	$	-	$	-
Grid		854		1,422
Total	$	854	$	1,422

Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Mar. 31, 2016

Payables And Accruals [Abstract]

Schedule of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses at March 31, 2016 and March 31, 2015 consisted of the following (in thousands):

	March 31,		March 31,
	2016		2015
Accounts payable	$	5,837	$	7,062
Accrued inventories in-transit		1,908		1,127
Accrued other miscellaneous expenses		3,003		3,254
Accrued compensation		7,526		5,960
Income taxes payable		1,281		278
Accrued warranty		3,601		3,934
Total	$	23,156	$	21,615

Schedule of Product Warranty Activity

Product warranty activity was as follows (in thousands):

	Fiscal Years Ended March 31,
	2016			2015
Balance at beginning of period	$	3,934		$	3,207
Change in accruals for warranties during the period		1,865			2,839
Settlements during the period		(2,198	)		(2,112	)
Balance at end of period	$	3,601		$	3,934

Warrants and Derivative Liabilities (Tables)

12 Months Ended

Mar. 31, 2016

Senior Convertible Note 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 Exchanged Warrant:

	March 31,			December 31,			September 30,			June 30,
Fiscal Year 15	2016			2015			2015			2015

Risk-free interest rate		0.66	%		0.96	%		0.64	%		0.74	%
Expected annual dividend yield		—	%		—	%		—	%		—	%
Expected volatility		76.76	%		76.68	%		73.39	%		71.61	%
Term (years)	1.51			1.76			2.01			2.26
Fair value	$0.4 million			$0.3 million			$0.1 million			$0.2 million

	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,			March 31,
Fiscal Year 13	2014			2013			2013			2013			2013			2013			2013

Risk-free interest rate		1.11	%		1.17	%		1.05	%		1.05	%		1.02	%		1.13	%		0.67	%
Expected annual dividend yield		—	%		—	%		—	%		—	%		—	%		—	%		—	%
Expected volatility		80.99	%		75.60	%		71.45	%		71.45	%		71.98	%		71.90	%		71.74	%
Term (years)	3.51			3.76			3.99			3.99				4.01			4.27			4.51
Fair value	$ 2.2 million			$ 2.2 million			$ 3.2 million			$ 2.2 million			$ 2.5 million			$ 3.0 million			$ 3.4 million

Hercules 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 Hercules Warrant:

	March 31,			December 31,			September 30,			June 30,
Fiscal Year 15	2016			2015			2015			2015

Risk-free interest rate		1.08	%		1.65	%		1.31	%		1.63	%
Expected annual dividend yield		—	%		—	%		—	%		—	%
Expected volatility		70.25	%		73.57	%		75.32	%		72.57	%
Term (years)		4.25			4.50			4.75			5.00
Fair value	$0.2 million			$0.2 million			$0.1 million			$0.2 million

							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:

	March 31,			December 31,			September 30,			June 30,
Fiscal Year 15	2016			2015			2015			2015

Risk-free interest rate		0.98	%		1.51	%		1.17	%		1.44	%
Expected annual dividend yield		—	%		—	%		—	%		—	%
Expected volatility		69.88	%		70.02	%		73.02	%		74.18	%
Term (years)		3.62			3.87			4.12			4.37
Fair value	$2.6 million			$2.1 million			$1.3 million			$1.8 million

							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

- 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, 2016

Income Tax Disclosure [Abstract]

Schedule of Income (Loss) Before Income Taxes

Income (loss) before income taxes for the fiscal years ended March 31, 2016, 2015, and 2014 are provided in the table as follows (in thousands):

	Fiscal years ended March 31,
	2016			2015			2014
Income (loss) before income tax expense:
U.S.	$	(29,436	)	$	(40,277	)	$	(91,558	)
Foreign		8,688			(8,563	)		36,152
Total	$	(20,748	)	$	(48,840	)	$	(55,406	)

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):

	Fiscal years ended March 31,
	2016			2015			2014
Current
Federal	$	459		$	47		$	287
State		-			-			-
Foreign		1,950			(274	)		614
Total current		2,409			(227	)		901

Deferred
Federal		(18	)		43			(49	)
State		-			-			-
Foreign		-			-			-
Total deferred		(18	)		43			(49	)

Income tax (benefit) expense	$	2,391		$	(184	)	$	852

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.

	Fiscal years ended March 31,
	2016				2015			2014
Statutory federal income tax rate		(34	)	%	(34	)	%	(34	)	%
State income taxes, net of federal benefit		1			2			-
Deemed dividend and dividends paid		5			1			1
Foreign income tax rate differential		5			6			(6	)
Stock options		1			1			2
Nondeductible expenses		-			1			1
Research and development tax credit		(5	)		-			-
Deferred warrants		-			(3	)		(1	)
Interest expense		-			-			5
Extinguishment of debt		-			-			3
Reversal of uncertain tax benefits		-			(6	)		-
True-up of foreign NOLs		19			-			-
Settlement of intercompany balances		(9	)		-			-
Nondeductible foreign currency exchange remeasurement loss		10			-			-
Valuation allowance		18			32			30
Effective income tax rate		11		%	-		%	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):

	March 31,			March 31,
	2016			2015
Deferred tax assets:
Net operating loss carryforwards	$	281,098		$	272,498
Research and development and other tax credit carryforwards		11,878			10,655
Accruals and reserves		28,088			37,153
Fixed assets and intangible assets		2,393			2,432
Other		14,494			18,514
Gross deferred tax assets		337,951			341,252
Valuation allowance		(301,393	)		(294,860	)
Total deferred tax assets		36,558			46,392

Deferred tax liabilities:
Intercompany debt		(27,117	)		(36,298	)
Other		(9,408	)		(10,174	)
Total deferred tax liabilities		(36,525	)		(46,472	)
Net deferred tax asset (liability)	$	33		$	(80	)

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, 2014	$	1,061
Reversal of uncertain tax positions		(1,061	)
Balance at March 31, 2015	$	-
Reversal of uncertain tax positions		-
Balance at March 31, 2016	$	-

Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2016

Stockholders Equity Note [Abstract]

Components of Employee Stock-Based Compensation

The components of employee stock-based compensation for the years ended March 31, 2016, 2015 and 2014 were as follows (in thousands):

	Fiscal years ended March 31,
	2016		2015		2014
Stock options	$	663	$	1,851	$	2,730
Restricted stock and stock awards		2,574		4,063		7,936
Employee stock purchase plan		11		22		30
Total stock-based compensation expense	$	3,248	$	5,936	$	10,696

Summary of Stock-Based Compensation Expense

The following table summarizes employee stock-based compensation expense by financial statement line item for the fiscal years ended March 31, 2016, 2015 and 2014 (in thousands):

	Fiscal years ended March 31,
	2016		2015		2014
Cost of revenues	$	274	$	719	$	1,002
Research and development		418		1,728		2,751
Selling, general and administrative		2,556		3,489		6,943
Total	$	3,248	$	5,936	$	10,696

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
				Exercise		Contractual		Intrinsic Value
	Options / Shares			Price		Term		(thousands)
Outstanding at March 31, 2015		380,940		$	84.57
Granted		-
Exercised		-
Cancelled/forfeited		(14,391	)		115.35
Outstanding at March 31, 2016		366,549		$	83.39		5.7	$	-
Exercisable at March 31, 2016		261,656		$	110.06		4.8	$	-
Fully vested and expected to vest at March 31, 2016		357,776		$	85.07		5.6	$	-

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 fiscal years ended March 31, 2016, 2015, and 2014 are as follows:

	Fiscal years ended March 31,
	2016	2015			2014
Expected volatility	N/A		85.5	%		75.1	%
Risk-free interest rate	N/A		1.9	%		1.7	%
Expected life (years)	N/A		5.8			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, 2016:

				Weighted		Intrinsic
				Average		Aggregate
				Grant Date		Value
	Shares			Fair Value		(thousands)
Outstanding at March 31, 2015		340,588		$	20.82
Granted		420,189			6.24
Vested		(262,984	)		14.56
Forfeited		(14,949	)		76.22
Outstanding at March 31, 2016		482,844		$	9.62	$	3,670

Commitments and Contingencies (Tables)

12 Months Ended

Mar. 31, 2016

Commitments And Contingencies Disclosure [Abstract]

Schedule of Minimum Future Lease Commitments

Minimum future lease commitments at March 31, 2016 were as follows (in thousands):

Fiscal years ended March 31,	Total
2017	$	1,135
2018		469
2019		252
2020		176
2021		165
Thereafter		-
Total	$	2,197

Schedule of Rent Expense Under Operating Leases

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


	Fiscal years ended March 31,
	2016		2015		2014
Rent expense	$	1,628	$	2,091	$	2,152

Restructuring (Tables)

12 Months Ended

Mar. 31, 2016

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, 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
Charges to operations		(5	)		38			33
Cash payments		(175	)		(38	)		(213	)
Accrued restructuring balance at March 31, 2016	$	-		$	-		$	-

Business Segments (Tables)

12 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Schedule of Operating Results and Assets of Segments

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

	Fiscal Years Ended March 31,
	2016		2015		2014
Revenues:
Wind	$	68,883	$	51,307	$	55,608
Grid		27,140		19,223		28,509
Total	$	96,023	$	70,530	$	84,117

	Fiscal Years Ended March 31,
	2016			2015			2014
Operating loss:
Wind	$	(1,256	)	$	(14,321	)	$	(5,213	)
Grid		(14,835	)		(26,890	)		(22,523	)
Unallocated corporate expenses		(4,027	)		(11,306	)		(13,693	)
Total	$	(20,118	)	$	(52,517	)	$	(41,429	)

Total assets for the two business segments as of March 31, 2016 and March 31, 2015 are as follows (in thousands):

	March 31,		March 31,
	2016		2015
Wind	$	34,389	$	41,947
Grid		36,255		42,482
Corporate assets		64,674		49,396
Total	$	135,318	$	133,825

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):

	Fiscal years ended March 31,
	2016		2015		2014
India	$	59,640	$	39,314	$	26,384
U.S.		14,565		9,820		11,013
China		8,455		10,410		24,748
Asia Pacific		5,364		3,788		8,223
Africa		2,697		616		2,187
Australia		2,410		1,653		3,037
Europe		1,775		2,239		5,213
Canada		1,117		2,690		3,312
Total	$	96,023	$	70,530	$	84,117

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,
	2016		2015
North America	$	48,685	$	54,673
Europe		868		854
Asia Pacific		225		570
Total	$	49,778	$	56,097

Quarterly Financial Data (Tables)

12 Months Ended

Mar. 31, 2016

Quarterly Financial Data [Abstract]

Schedule Of Quarterly Financial Data

(In thousands, except per share amount)	For the year ended March 31, 2016:
Three Months Ended	June 30,			September 30,			December 31,			March 31,
	2015			2015			2015			2016
Total revenue	$	23,723		$	19,004		$	25,772		$	27,524
Operating loss		(8,257	)		(6,841	)		(3,312	)		(1,708	)
Net loss		(9,121	)		(7,698	)		(2,957	)		(3,363	)
Net loss per common share—basic		(0.75	)		(0.57	)		(0.22	)		(0.25	)
Net loss per common share—diluted		(0.75	)		(0.57	)		(0.22	)		(0.25	)

	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	)

Nature of the Business and Operations and Liquidity - Additional Information (Detail)					1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended			48 Months Ended
	Mar. 11, 2016 USD ($)	Oct. 06, 2015 USD ($)	Apr. 29, 2015 USD ($)	Mar. 24, 2015	Dec. 31, 2015 USD ($)	Mar. 31, 2016 USD ($) Employee	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($) Employee	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2016 USD ($) Employee	Mar. 31, 2013 USD ($)
Description Of Business [Line Items]
Reverse stock split				0.1
Accumulated deficit						$ (928,184,000)		$ (928,184,000)	$ (905,045,000)		$ (928,184,000)
Cash and cash equivalents						$ 39,330,000		39,330,000	20,490,000	$ 43,114,000	$ 39,330,000	$ 39,243,000
Net cash used in operating activities								$ 4,559,000	32,676,000	13,267,000
Number of workforce persons \| Employee						369		369			369
Cash flows from financing activities								$ 18,202,000	8,783,000	12,796,000	$ 71,000,000
Proceeds from additional equity offering			$ 22,300,000
Gain on minority interest investments								(356,000)	$ (743,000)	$ (1,008,000)
Gain on sale of minority interests								3,092,000
Proceeds from sale of minority interests								3,092,000
Tres Amigas
Description Of Business [Line Items]
Percentage of minority share investment sold	100.00%
Minority share investment sold, amount	$ 600,000
Gain on sale of minority interests						$ 300,000
Tres Amigas \| Scenario Forecast
Description Of Business [Line Items]
Proceeds from sale of minority interests							$ 300,000
Blade Dynamics Ltd
Description Of Business [Line Items]
Percentage of outstanding common stock		100.00%
Gain on minority interest investments								2,800,000
Milestone achievement period		3 years
Maximum \| Blade Dynamics Ltd
Description Of Business [Line Items]
Additional proceeds receivable upon successful achievement of certain milestones		$ 1,200,000
Inox Wind Limited
Description Of Business [Line Items]
Strategic agreements value					$ 210,000,000
Upfront payment received under license agreement						6,000,000
Amount of advance payment not made under supply contract						$ 2,000,000		$ 2,000,000			$ 2,000,000
Inox Wind Limited \| Minimum
Description Of Business [Line Items]
Period allowable to manufacture the electrical control system								3 years
Inox Wind Limited \| Maximum
Description Of Business [Line Items]
Period allowable to manufacture the electrical control system								4 years

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Inventory reserve	$ 2,700		$ 2,700	$ 1,400
Benefit to cost of revenues			5,000	8,000	$ 4,300
Impairment of minority interest investments			746	3,464	1,265
Payments received from customers			$ 0	$ 0	$ 3,700
Guaranteed annual payments, description			BASF has also agreed to make guaranteed annual payments to the Company through 2017 and has an option to continue the joint development through 2018.
Minimum percentage of amount being realized upon ultimate settlement			50.00%
Repatriated amount			$ 1,200
Common equivalent shares not included in the calculation of diluted EPS			1,552,959	1,567,352	643,158
Net foreign currency transaction and hedging gains (losses)			$ (2,300)	$ 2,800	$ (100)
Foreign Earnings Repatriated
Federal and state deferred tax liability	400		400
Tres Amigas
Impairment of minority interest investments			$ 700
Blade Dynamics Ltd
Impairment of minority interest investments				$ 3,500	$ 1,300
Maximum
Warranty period			3 years
Minimum
Warranty period			1 year
Inox Wind Limited
Strategic agreements value		$ 210,000
Inox Wind Limited \| Maximum
Period allowable to manufacture the electrical control system			4 years
Inox Wind Limited \| Minimum
Period allowable to manufacture the electrical control system			3 years
BASF Corporation
License revenue	$ 3,000
Credit Concentration Risk \| Accounts Receivable \| Inox Wind Limited \| Maximum
Risk percentage			84.00%	56.00%
Credit Concentration Risk \| Accounts Receivable \| Inox Wind Limited \| Minimum
Risk percentage			10.00%	10.00%

Summary of Significant Accounting Policies - Estimated Useful Life of Property, Plant and Equipment (Detail)	12 Months Ended
	Mar. 31, 2016
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 ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Accounting Policies [Abstract]
Net loss	$ (3,363)	$ (2,957)	$ (7,698)	$ (9,121)	$ (3,363)	$ (6,353)	$ (25,423)	$ (13,517)	$ (23,139)	$ (48,656)	$ (56,258)
Weighted-average shares of common stock outstanding									13,295	8,559	6,411
Weighted-average shares subject to repurchase									(117)	(82)	(149)
Shares used in per-share calculation ― basic									13,178	8,477	6,262
Shares used in per-share calculation ― diluted									13,178	8,477	6,262
Net loss per share ― basic	$ (0.25)	$ (0.22)	$ (0.57)	$ (0.75)	$ (0.36)	$ (0.72)	$ (3.12)	$ (1.74)	$ (1.76)	$ (5.74)	$ (8.98)
Net loss per share ― diluted	$ (0.25)	$ (0.22)	$ (0.57)	$ (0.75)	$ (0.36)	$ (0.72)	$ (3.12)	$ (1.74)	$ (1.76)	$ (5.74)	$ (8.98)

- 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 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 on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	$ 16,040	$ 12,519
Warrants	3,227	2,999
Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	16,040	12,519
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrants	$ 3,227	$ 2,999

- 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 on Recurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	$ 2,999
Ending balance	3,227	$ 2,999
Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	2,999	2,601
Warrant issuance with equity offering		4,255
Warrant issuance with senior secured term loan		106
Mark to market adjustment	228	(3,963)
Ending balance	$ 3,227	$ 2,999

- Definition

+ References + Details

Accounts Receivable - Schedule of Accounts Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Receivables [Abstract]
Accounts receivable (billed)	$ 18,089	$ 8,946
Accounts receivable (unbilled)	1,229	987
Less: Allowance for doubtful accounts	(54)	(54)
Accounts receivable, net	$ 19,264	$ 9,879

Inventory - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 9,665	$ 9,411
Work-in-process	3,411	2,117
Finished goods	3,215	7,487
Deferred program costs	2,221	1,581
Net inventory	$ 18,512	$ 20,596

Property, Plant and Equipment - Schedule of Cost and Accumulated Depreciation of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 117,267	$ 125,465
Less accumulated depreciation	(67,489)	(69,368)
Property, plant and equipment, net	49,778	56,097
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	601	130
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	34,549	34,549
Equipment And Software
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	73,659	81,855
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,215	1,156
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 3,600	$ 4,132

Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	$ 9,432	$ 9,280
Intangible assets, Accumulated Amortization	(8,578)	(7,858)
Intangible assets, Net Book Value	854	1,422
Licenses
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	4,422	4,422
Intangible assets, Accumulated Amortization	(3,739)	(3,328)
Intangible assets, Net Book Value	$ 683	1,094
Intangible assets, Estimated Useful Life	7 years
Core Technology And Know How
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	$ 5,010	4,858
Intangible assets, Accumulated Amortization	(4,839)	(4,530)
Intangible assets, Net Book Value	$ 171	$ 328
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	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 0.6	$ 0.6	$ 0.8

Intangible Assets - Schedule of Expected Future Amortization Expense (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
2017	$ 553
2018	301
Intangible assets, Net Book Value	$ 854	$ 1,422

Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Payables And Accruals [Abstract]
Accounts payable	$ 5,837	$ 7,062
Accrued inventories in-transit	1,908	1,127
Accrued other miscellaneous expenses	3,003	3,254
Accrued compensation	7,526	5,960
Income taxes payable	1,281	278
Accrued warranty	3,601	3,934	$ 3,207
Total	$ 23,156	$ 21,615

Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Product Warranties Disclosures [Abstract]
Balance at beginning of period	$ 3,934	$ 3,207
Change in accruals for warranties during the period	1,865	2,839
Settlements during the period	(2,198)	(2,112)
Balance at end of period	$ 3,601	$ 3,934

Debt - Additional Information (Detail) - USD ($)							1 Months Ended	3 Months Ended				9 Months Ended	12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Apr. 29, 2015	Dec. 19, 2014	Nov. 13, 2014	Mar. 02, 2014	Nov. 15, 2013	Apr. 04, 2012	Apr. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Debt Instrument [Line Items]
Proceeds from additional equity offering	$ 22,300,000
Exercise price	$ 9.41
Warrants expiration date			Nov. 13, 2019
Interest expense													$ 1,000,000	$ 1,700,000	$ 9,700,000
Non-cash interest expense amortization of debt discount													400,000	500,000	7,700,000
Loss on extinguishment of debt															(5,197,000)
Hercules Technology Growth Capital \| Hercules Warrant
Debt Instrument [Line Items]
Number of shares received from warrants received to purchase common stock		58,823
Exercise price		$ 11.00					$ 9.41
Warrants expiration date		Jun. 30, 2020
Capital Ventures International
Debt Instrument [Line Items]
Debt conversion, shares issued				663,000
Loss on extinguishment of debt										$ (5,200,000)
Senior Secured Loan \| Hercules Technology Growth Capital
Debt Instrument [Line Items]
Number of shares received from warrants received to purchase common stock		58,823
Exercise price		$ 11.00
Senior Convertible Debt \| Capital Ventures International
Debt Instrument [Line Items]
Number of shares received from warrants received to purchase common stock						309,406
Non-cash interest expense amortization of debt discount															$ 4,100,000
Net proceeds after fees and expenses of purchase agreement						$ 23,200,000
Term Loan B \| Senior Secured Loan \| Hercules Technology Growth Capital
Debt Instrument [Line Items]
Legal and origination costs											$ 200,000
Debt, face amount					$ 10,000,000
Net proceeds from debt					$ 9,800,000
Interest rate on loan					11.00%
End of term fee													500,000
Minimum amount of proceeds from specified asset dispositions for mandatory prepayment feature													1,000,000
Outstanding principal balance													2,700,000
Number of shares received from warrants received to purchase common stock		25,641
Fair value of warrants at issuance		$ 200,000
Interest expense													1,000,000
Total debt discount being amortized into interest expense													200,000	400,000
Term Loan B \| Senior Secured Loan \| Hercules Technology Growth Capital \| Prime Rate \| Minimum
Debt Instrument [Line Items]
Prime rate					3.75%
Term Loan C \| Senior Secured Loan \| Hercules Technology Growth Capital
Debt Instrument [Line Items]
Legal and origination costs									$ 100,000
Debt, face amount		1,500,000
Net proceeds from debt		$ 1,400,000
End of term fee												$ 100,000
Debt Instrument, Maturity Date												Jun. 01, 2017
Interest expense													300,000
Non-cash interest expense amortization of debt discount													100,000
Term Loan C \| Senior Secured Loan \| Hercules Technology Growth Capital \| Minimum
Debt Instrument [Line Items]
Proceeds from additional equity offering								$ 10,000,000
Term Loan C \| Senior Secured Loan \| Hercules Technology Growth Capital \| Maximum
Debt Instrument [Line Items]
Non-cash interest expense amortization of debt discount														$ 100,000
Term Loan \| Senior Secured Loan \| Hercules Technology Growth Capital
Debt Instrument [Line Items]
Number of shares received from warrants received to purchase common stock		13,927
Fair value of warrants at issuance		$ 400,000
Covenant, unrestricted cash balance requirement													$ 2,000,000
Debt Instrument, Maturity Date, Description													As a result of the Company’s April 2015 equity offering, the Minimum Threshold was reduced to the lesser of $2.0 million or the aggregate outstanding principal balance of the Term Loans.
Repayments of term loan													$ 2,000,000

Warrants and Derivative Liabilities - Additional Information (Detail) - USD ($)					1 Months Ended		12 Months Ended
	Apr. 29, 2015	Dec. 19, 2014	Nov. 13, 2014	Apr. 04, 2012	Apr. 30, 2015	Dec. 31, 2012	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Derivative [Line Items]
Exercise price	$ 9.41
Gain (loss) in change of fair value of derivative instruments and warrants							$ (228,000)	$ 3,963,000	$ 1,872,000
Warrants expiration date			Nov. 13, 2019
Common stock units offered			909,090
Warrant to purchase one share of common stock			90.00%
Number of warrants issued to purchase common stock			818,181
Sale of stock, price per share			$ 11.00
Hercules Warrant
Derivative [Line Items]
Gain (loss) in change of fair value of derivative instruments and warrants							0	0
Hercules Warrant \| Hercules Technology Growth Capital
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock		58,823
Exercise price		$ 11.00			$ 9.41
Warrants expiration date		Jun. 30, 2020
Hudson Warrant
Derivative [Line Items]
Gain (loss) in change of fair value of derivative instruments and warrants							$ (100,000)	1,800,000
Capital Ventures International
Derivative [Line Items]
Warrant exercise, waiting period							6 months
Warrant exercise period							5 years
Required notification period							61 days
Gain (loss) in change of fair value of derivative instruments and warrants							$ (100,000)	$ 1,900,000	$ 1,200,000
Senior Convertible Debt \| Capital Ventures International
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock				309,406
Exercise price				$ 15.94
New Unsecured Senior Convertible Note \| Capital Ventures International \| Minimum
Derivative [Line Items]
Beneficial ownership limitation percentage						4.99%
New Unsecured Senior Convertible Note \| Capital Ventures International \| Maximum
Derivative [Line Items]
Beneficial ownership limitation percentage						9.99%

Warrants and Derivative Liabilities - Schedule of Assumptions Used to Calculate the Fair Value of Warrants (Detail) - USD ($) $ in Millions				3 Months Ended
	Dec. 19, 2014	Nov. 13, 2014	Oct. 09, 2013	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	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, 2013
Senior Convertible Note Warrant
Derivative [Line Items]
Risk-free interest rate				0.66%	0.96%	0.64%	0.74%	0.73%	1.00%	1.07%	0.98%	1.11%	1.17%	1.02%	1.13%	0.67%
Expected volatility				76.76%	76.68%	73.39%	71.61%	70.42%	72.38%	76.20%	83.50%	80.99%	75.60%	71.98%	71.90%	71.74%
Term (years)				1 year 6 months 4 days	1 year 9 months 4 days	2 years 4 days	2 years 3 months 4 days	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
Fair value				$ 0.4	$ 0.3	$ 0.1	$ 0.2	$ 0.3	$ 0.5	$ 1.5	$ 2.3	$ 2.2	$ 2.2	$ 2.5	$ 3.0	$ 3.4
Senior Convertible Note Warrant \| Post Modification
Derivative [Line Items]
Risk-free interest rate			1.05%
Expected volatility			71.45%
Term (years)			3 years 11 months 27 days
Fair value			$ 3.2
Senior Convertible Note Warrant \| Pre Modification
Derivative [Line Items]
Risk-free interest rate			1.05%
Expected volatility			71.45%
Term (years)			3 years 11 months 27 days
Fair value			$ 2.2
Hercules Warrant
Derivative [Line Items]
Risk-free interest rate	1.74%			1.08%	1.65%	1.31%	1.63%	1.41%	1.73%
Expected volatility	70.26%			70.25%	73.57%	75.32%	72.57%	74.60%	77.43%
Term (years)	5 years 6 months 11 days			4 years 3 months	4 years 6 months	4 years 9 months	5 years	5 years 3 months	5 years 6 months
Fair value	$ 0.2			$ 0.2	$ 0.2	$ 0.1	$ 0.2	$ 0.2	$ 0.2
November 2014 Warrant
Derivative [Line Items]
Risk-free interest rate		1.64%		0.98%	1.51%	1.17%	1.44%	1.28%	1.61%
Expected volatility		72.86%		69.88%	70.02%	73.02%	74.18%	75.96%	78.00%
Term (years)		5 years		3 years 7 months 13 days	3 years 10 months 13 days	4 years 1 month 13 days	4 years 4 months 13 days	4 years 7 months 13 days	4 years 10 months 13 days
Fair value		$ 4.3		$ 2.6	$ 2.1	$ 1.3	$ 1.8	$ 2.5	$ 3.2

Income Taxes - Schedule of Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
U.S.	$ (29,436)	$ (40,277)	$ (91,558)
Foreign	8,688	(8,563)	36,152
Loss before income tax expense	$ (20,748)	$ (48,840)	$ (55,406)

Income Taxes - Schedule of Components of Income Tax Expense (Benefit) Attributable to Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Current, Federal	$ 459	$ 47	$ 287
Current, Foreign	1,950	(274)	614
Total current	2,409	(227)	901
Deferred, Federal	(18)	43	(49)
Total deferred	(18)	43	(49)
Income tax (benefit) expense	$ 2,391	$ (184)	$ 852

Income Taxes - Schedule of Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate (Detail)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	(34.00%)	(34.00%)	(34.00%)
State income taxes, net of federal benefit	1.00%	2.00%
Deemed dividend and dividends paid	5.00%	1.00%	1.00%
Foreign income tax rate differential	5.00%	6.00%	(6.00%)
Stock options	1.00%	1.00%	2.00%
Nondeductible expenses		1.00%	1.00%
Research and development tax credit	(5.00%)
Deferred warrants		(3.00%)	(1.00%)
Interest expense			5.00%
Extinguishment of debt			3.00%
Reversal of uncertain tax benefits		(6.00%)
True-up of foreign NOLs	19.00%
Settlement of intercompany balances	(9.00%)
Nondeductible foreign currency exchange remeasurement loss	10.00%
Valuation allowance	18.00%	32.00%	30.00%
Effective income tax rate	11.00%		1.00%

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 281,098	$ 272,498
Research and development and other tax credit carryforwards	11,878	10,655
Accruals and reserves	28,088	37,153
Fixed assets and intangible assets	2,393	2,432
Other	14,494	18,514
Gross deferred tax assets	337,951	341,252
Valuation allowance	(301,393)	(294,860)
Total deferred tax assets	36,558	46,392
Intercompany debt	(27,117)	(36,298)
Other	(9,408)	(10,174)
Total deferred tax liabilities	(36,525)	(46,472)
Net deferred tax asset	$ 33
Net deferred tax liability		$ (80)

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Deferred tax asset reflecting the benefit of deductions from the exercise of stock options	$ 13,000,000
Excess tax deductions from stock option exercised	$ 52,500,000
Stock options exercised dates	March 31, 2006 through 2016
Undistributed earnings available for repatriation	$ 1,200,000
Uncertain tax positions	0
Unrecognized tax benefits that, if recognized, would result in a reduction of the Company's effective tax rate	0	$ 0
Austria
Net operating loss carryforwards	$ 42,600,000
China
Operating loss carryforwards expiration years	Dec. 31, 2016
Net operating loss carryforwards	$ 32,000,000
Net operating loss carryforward period	5 years
China \| Earliest Tax Year
Income tax year under examination	2013
China \| Latest Tax Year
Income tax year under examination	2014
Romania
Operating loss carryforwards expiration years	Mar. 31, 2023
Net operating loss carryforwards	$ 500,000
Federal
Net operating loss carryforwards	791,000,000
Research and development and other tax credit carryforwards	9,300,000
State
Net operating loss carryforwards	177,000,000
Research and development and other tax credit carryforwards	2,900,000
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, 2036
Expiration of other tax credit carryforwards	Mar. 31, 2036
Maximum \| Austria
Open tax year	2016
Maximum \| China
Open tax year	2012
Maximum \| Romania
Open tax year	2016
Maximum \| U.S
Open tax year	2016
Minimum
Operating loss carryforwards expiration years	Mar. 31, 2017
Expiration of other tax credit carryforwards	Mar. 31, 2017
Minimum \| Austria
Open tax year	2012
Minimum \| China
Open tax year	2008
Minimum \| Romania
Open tax year	2014
Minimum \| U.S
Open tax year	1995

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

Stockholders' Equity - Components of Employee Stock-Based Compensation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 3,248	$ 5,936	$ 10,696
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	663	1,851	2,730
Restricted Stock and Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	2,574	4,063	7,936
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 11	$ 22	$ 30

Stockholders' Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	Apr. 29, 2015	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Nov. 13, 2014
Stockholders Equity [Line Items]
Weighted-average grant-date fair value of stock options granted			$ 10.18	$ 16.20
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value		$ 0	$ 0	$ 0
Shares, Granted		420,189
Number of shares cancelled		14,949
Stock-based compensation plans expired terms		May 02, 2007
Contractual life of options, in years		10 years
Vesting period of shares granted by option upon election to board		2 years
Compensation expense recognized			$ 100,000	100,000
Common stock, shares issued		14,107,126	9,624,275
Sale of stock, price per share					$ 11.00
Proceeds From Issuance Of Common Stock	$ 22,300,000
Cowen and Company, LLC
Stockholders Equity [Line Items]
Common stock, shares issued	4,000,000
Sale of stock, price per share	$ 6.00
Proceeds From Issuance Of Common Stock	$ 22,300,000
Maximum
Stockholders Equity [Line Items]
Compensation expense recognized		$ 100,000
Stock Options
Stockholders Equity [Line Items]
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures		$ 600,000
Weighted-average period over which unrecognized compensation expense is expected to be recognized (years)		2 years 4 months 24 days
Stock options granted in period		0
Stock Options \| Minimum
Stockholders Equity [Line Items]
Vesting period, in years		3 years
Stock Options \| Maximum
Stockholders Equity [Line Items]
Vesting period, in years		5 years
Restricted Stock and Stock Awards
Stockholders Equity [Line Items]
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures		$ 2,600,000
Weighted-average period over which unrecognized compensation expense is expected to be recognized (years)		1 year 9 months 18 days
Total fair value of restricted stock granted		$ 2,600,000	$ 5,600,000	4,500,000
Total fair value of restricted stock granted for bonuses and severance				500,000
Total fair value of restricted stock vested		$ 1,700,000	$ 3,100,000	3,700,000
Total fair value of restricted stock granted for bonuses and severance				$ 500,000
Vesting period, in years		3 years
Performance-Based Restricted Stock
Stockholders Equity [Line Items]
Shares, Granted		0	38,021	40,201
Restricted Stock Units (RSUs)
Stockholders Equity [Line Items]
Number of shares cancelled		6,666
2007 Director Stock Option Plan
Stockholders Equity [Line Items]
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
Number of shares authorized for issuance under the plan		35,505
2007 Stock Incentive Plan
Stockholders Equity [Line Items]
Number of shares authorized for issuance under the plan		195,194
Employee Stock Purchase Plan
Stockholders Equity [Line Items]
Number of shares authorized for issuance under the plan		0
Percentage of purchase discount		15.00%

Stockholders' Equity - Summary of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 3,248	$ 5,936	$ 10,696
Cost of Revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	274	719	1,002
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	418	1,728	2,751
Selling, General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 2,556	$ 3,489	$ 6,943

Stockholders' Equity - Summary of Employee and Non-Employee Stock Options Activity (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options / Shares, Outstanding	380,940
Options / Shares, Cancelled/Forfeited	(14,391)
Options / Shares, Outstanding	366,549
Options / Shares, Exercisable at March 31, 2016	261,656
Options / Shares, Fully vested and expected to vest at March 31, 2016	357,776
Weighted-Average Exercise Price, Outstanding	$ 84.57
Weighted-Average Exercise Price, Cancelled/Forfeited	115.35
Weighted-Average Exercise Price, Outstanding	83.39
Weighted-Average Exercise Price, Exercisable at March 31, 2016	110.06
Weighted-Average Exercise Price, Fully vested and expected to vest at March 31, 2016	$ 85.07
Weighted-Average Remaining Contractual Term, Outstanding at March 31, 2016	5 years 8 months 12 days
Weighted-Average Remaining Contractual Term, Exercisable at March 31, 2016	4 years 9 months 18 days
Weighted-Average Remaining Contractual Term, Fully vested and expected to vest at March 31, 2016	5 years 7 months 6 days
Aggregate Intrinsic Value, Exercisable at March 31, 2016	$ 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, 2016	Mar. 31, 2015	Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected volatility		85.50%	75.10%
Risk-free interest rate		1.90%	1.70%
Expected life (years)		5 years 9 months 18 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) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Outstanding \| shares	340,588
Shares, Granted \| shares	420,189
Shares, Vested \| shares	(262,984)
Shares, Forfeited \| shares	(14,949)
Shares, Outstanding \| shares	482,844
Weighted Average Grant Date Fair Value, Outstanding \| $ / shares	$ 20.82
Weighted Average Grant Date Fair Value, Granted \| $ / shares	6.24
Weighted Average Grant Date Fair Value, Vested \| $ / shares	14.56
Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	76.22
Weighted Average Grant Date Fair Value, Outstanding \| $ / shares	$ 9.62
Intrinsic Aggregate Value, Outstanding at March 31, 2016 \| $	$ 3,670

Commitments and Contingencies - Additional Information (Detail) € in Thousands, $ in Thousands, ¥ in Millions									3 Months Ended	12 Months Ended
	Feb. 04, 2015 EUR (€)	Jan. 14, 2015 USD ($)	Feb. 27, 2012 USD ($)	Feb. 27, 2012 CNY (¥)	Oct. 08, 2011 USD ($)	Oct. 08, 2011 CNY (¥)	Sep. 13, 2011 USD ($)	Sep. 13, 2011 CNY (¥)	Mar. 31, 2015 USD ($)	Mar. 31, 2011 USD ($)	Mar. 31, 2011 CNY (¥)	Mar. 31, 2016 USD ($) ft²
Commitments And Contingencies [Line Items]
Total space leased, square feet \| ft²												183,000
Restricted cash included in current assets									$ 2,822			$ 457
Restricted cash									1,236			$ 934
Ghodawat Energy Pvt Ltd
Commitments And Contingencies [Line Items]
Settlement amount \| €	€ 7,450
Gain on reversed portion of accrued arbitration liability									1,200
Reimbursement of arbitration expenses		$ 2,300
Reversal of previously reimbursed expense									$ 2,200
Sinovel Wind Group Co. Ltd.
Commitments And Contingencies [Line Items]
Sought compensation amount			$ 17,000	¥ 105	$ 190,000	¥ 1,200	$ 76,000	¥ 485
Value of the undelivered components										$ 720,000	¥ 4,600

Commitments and Contingencies - Schedule of Minimum Future Lease Commitments (Detail) $ in Thousands	Mar. 31, 2016 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2017	$ 1,135
2018	469
2019	252
2020	176
2021	165
Total	$ 2,197

Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
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	$ 0.4

Minority Investments - Additional Information (Detail)			3 Months Ended	6 Months Ended	12 Months Ended
Minority Investments - Additional Information (Detail)	Mar. 11, 2016 USD ($)	Oct. 06, 2015 USD ($)	Mar. 31, 2016 USD ($) Item	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($) Item	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)
Schedule Of Equity Method Investments [Line Items]
Impairment charge on investment					$ 746,000	$ 3,464,000	$ 1,265,000
Gain on sale of minority interests					3,092,000
Proceeds from sale of minority interests					3,092,000
Gain on minority interest investments					$ (356,000)	(743,000)	(1,008,000)
Tres Amigas
Schedule Of Equity Method Investments [Line Items]
Number of commonly interconnected power grids \| Item			3		3
Equity method investment, aggregate cost			$ 5,400,000		$ 5,400,000
Impairment charge on investment					700,000
Percentage of minority share investment sold	100.00%
Minority share investment sold, amount	$ 600,000
Gain on sale of minority interests			300,000
Tres Amigas \| Scenario Forecast
Schedule Of Equity Method Investments [Line Items]
Proceeds from sale of minority interests				$ 300,000
Blade Dynamics Ltd
Schedule Of Equity Method Investments [Line Items]
Impairment charge on investment						$ 3,500,000	$ 1,300,000
Cost method investment, original cost			$ 8,000,000		8,000,000
Percentage of outstanding common stock		100.00%
Gain on minority interest investments					$ 2,800,000
Milestone achievement period		3 years
Blade Dynamics Ltd \| Maximum
Schedule Of Equity Method Investments [Line Items]
Additional proceeds receivable upon successful achievement of certain milestones		$ 1,200,000

Restructuring - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost And Reserve [Line Items]
Employee severance and benefit costs		$ 1.9	$ 1.7
Maximum
Restructuring Cost And Reserve [Line Items]
Employee severance and benefit costs	$ 0.1

Restructuring - Schedule of Restructuring Charges and Cash Payments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	$ 180	$ 844
Charges to operations	33	1,902
Cash payments	(213)	(2,566)
Accrued restructuring balance		180
Severance Pay And Benefits
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	180	844
Charges to operations	(5)	618
Cash payments	(175)	(1,282)
Accrued restructuring balance		180
Facility Exit And Relocation Costs
Restructuring Cost And Reserve [Line Items]
Charges to operations	38	1,284
Cash payments	$ (38)	$ (1,284)

Business Segments - Additional Information (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2016 USD ($) Segment MW	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments \| Segment	2
Stock-based compensation expense	$ 3,248	$ 5,936	$ 10,696
Restructuring and impairment charges	$ 779	$ 5,366	$ 2,998
Geographic Concentration Risk \| Sales Revenue, Net \| Outside The United States
Segment Reporting Information [Line Items]
Risk percentage	85.00%	86.00%	87.00%
Customer Concentration Risk \| Sales Revenue, Net \| Inox Wind Limited
Segment Reporting Information [Line Items]
Risk percentage	62.00%	56.00%	31.00%
Customer Concentration Risk \| Sales Revenue, Net \| Beijing JINGCHENG
Segment Reporting Information [Line Items]
Risk percentage			18.00%
Minimum
Segment Reporting Information [Line Items]
Megawatts of drive trains and power ratings \| MW	2

Business Segments - Operating Results for Two Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 27,524	$ 25,772	$ 19,004	$ 23,723	$ 25,129	$ 21,250	$ 12,455	$ 11,696	$ 96,023	$ 70,530	$ 84,117
Operating loss	$ (1,708)	$ (3,312)	$ (6,841)	$ (8,257)	$ (5,715)	$ (7,735)	$ (26,400)	$ (12,667)	(20,118)	(52,517)	(41,429)
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Operating loss									(4,027)	(11,306)	(13,693)
Wind
Segment Reporting Information [Line Items]
Revenues									68,883	51,307	55,608
Wind \| Operating Segments
Segment Reporting Information [Line Items]
Operating loss									(1,256)	(14,321)	(5,213)
Grid
Segment Reporting Information [Line Items]
Revenues									27,140	19,223	28,509
Grid \| Operating Segments
Segment Reporting Information [Line Items]
Operating loss									$ (14,835)	$ (26,890)	$ (22,523)

Business Segments - Total Business Segments Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 135,318	$ 133,825
Operating Segments \| Wind
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	34,389	41,947
Operating Segments \| Grid
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	36,255	42,482
Corporate assets
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 64,674	$ 49,396

Business Segments - Geographic Information about Revenue, Based on Shipments to Customers by Region (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 27,524	$ 25,772	$ 19,004	$ 23,723	$ 25,129	$ 21,250	$ 12,455	$ 11,696	$ 96,023	$ 70,530	$ 84,117
India
Segment Reporting Information [Line Items]
Revenues									59,640	39,314	26,384
U.S
Segment Reporting Information [Line Items]
Revenues									14,565	9,820	11,013
China
Segment Reporting Information [Line Items]
Revenues									8,455	10,410	24,748
Asia Pacific
Segment Reporting Information [Line Items]
Revenues									5,364	3,788	8,223
Africa
Segment Reporting Information [Line Items]
Revenues									2,697	616	2,187
Australia
Segment Reporting Information [Line Items]
Revenues									2,410	1,653	3,037
Europe
Segment Reporting Information [Line Items]
Revenues									1,775	2,239	5,213
Canada
Segment Reporting Information [Line Items]
Revenues									$ 1,117	$ 2,690	$ 3,312

Business Segments - Geographic Information about Property, Plant and Equipment Associated with Particular Regions (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 49,778	$ 56,097
North America
Segment Reporting Information [Line Items]
Property, plant and equipment, net	48,685	54,673
Europe
Segment Reporting Information [Line Items]
Property, plant and equipment, net	868	854
Asia Pacific
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 225	$ 570

Quarterly Financial Data - Schedule of Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Quarterly Financial Data [Abstract]
Total revenue	$ 27,524	$ 25,772	$ 19,004	$ 23,723	$ 25,129	$ 21,250	$ 12,455	$ 11,696	$ 96,023	$ 70,530	$ 84,117
Operating loss	(1,708)	(3,312)	(6,841)	(8,257)	(5,715)	(7,735)	(26,400)	(12,667)	(20,118)	(52,517)	(41,429)
Net loss	$ (3,363)	$ (2,957)	$ (7,698)	$ (9,121)	$ (3,363)	$ (6,353)	$ (25,423)	$ (13,517)	$ (23,139)	$ (48,656)	$ (56,258)
Net loss per share ― basic	$ (0.25)	$ (0.22)	$ (0.57)	$ (0.75)	$ (0.36)	$ (0.72)	$ (3.12)	$ (1.74)	$ (1.76)	$ (5.74)	$ (8.98)
Net loss per share ― diluted	$ (0.25)	$ (0.22)	$ (0.57)	$ (0.75)	$ (0.36)	$ (0.72)	$ (3.12)	$ (1.74)	$ (1.76)	$ (5.74)	$ (8.98)

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

+ References + Details

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Allowance for Doubtful Accounts Receivable
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance, Beginning of Year	$ 54	$ 16
Additions		54	$ 16
Write-offs		(16)
Balance, End of Year	54	54	16
Deferred Tax Asset Valuation Allowance
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance, Beginning of Year	294,860	282,824	261,961
Additions	9,028	15,189	26,649
Write-offs	(2,495)	(3,153)	(5,786)
Balance, End of Year	$ 301,393	$ 294,860	$ 282,824

Subsequent Events	12 Months Ended
Subsequent Events	Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	19. Subsequent Events The Company has performed an evaluation of subsequent events through the time of filing this Annual Report on Form 10-K with the SEC, and has determined that there are no such events to report.

Accounts Payable and Accrued Expenses - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2016
Minimum
Product Warranty Liability [Line Items]
Warranty period	1 year
Maximum
Product Warranty Liability [Line Items]
Warranty period	3 years