Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Mar. 31, 2017	May 23, 2017	Sep. 30, 2016
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2016
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		18,591,648
Entity Public Float			$ 83.1

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Current assets:
Cash and cash equivalents	$ 26,784	$ 39,330
Accounts receivable, net	7,956	19,264
Inventory	17,462	18,512
Prepaid expenses and other current assets	2,703	5,778
Restricted cash	795	457
Total current assets	55,700	83,341
Property, plant and equipment, net	43,438	49,778
Intangibles, net	301	854
Restricted cash	165	934
Deferred tax assets	407	96
Other assets	233	315
Total assets	100,244	135,318
Current liabilities:
Accounts payable and accrued expenses	14,490	23,156
Note payable, current portion, net of discount of $19 as of March 31, 2017 and $42 as of March 31, 2016	1,481	2,624
Derivative liabilities	1,923	3,227
Deferred revenue	14,323	12,000
Total current liabilities	32,217	41,007
Note payable, net of discount of $133 as of March 31, 2016	0	1,367
Deferred revenue	7,631	9,269
Deferred tax liabilities	125	63
Other liabilities	45	63
Total liabilities	40,018	51,769
Commitments and contingencies
Common stock, $0.01 par value, 75,000,000 shares authorized; 14,713,839 and 14,107,126 shares issued at March 31, 2017 and 2016, respectively
Common stock, $0.01 par value, 75,000,000 shares authorized; 14,713,839 and 14,107,126 shares issued at March 31, 2017 and 2016, respectively	147	141
Additional paid-in capital	1,017,510	1,011,813
Treasury stock, at cost, 97,529 and 51,506 shares at March 31, 2017 and 2016, respectively	(1,371)	(881)
Accumulated other comprehensive (loss) income	(503)	660
Accumulated deficit	(955,557)	(928,184)
Total stockholders' equity	60,226	83,549
Total liabilities and stockholders' equity	$ 100,244	$ 135,318

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Statement of Financial Position [Abstract]
Note payable, Unamortized Discount, Current	$ 19	$ 42
Note payable, Unamortized Discount, Noncurrent	$ 0	$ 133
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	14,713,839	14,107,126
Treasury Stock, shares	97,529	51,506

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenues	$ 75,195	$ 96,023	$ 70,530
Cost of revenues	64,352	74,041	67,442
Gross profit	10,843	21,982	3,088
Operating expenses:
Research and development	12,540	12,303	11,878
Selling, general and administrative	25,688	28,861	29,217
Arbitration award expense	0	0	8,987
Restructuring and impairments	0	779	5,366
Amortization of acquisition related intangibles	157	157	157
Total operating expenses	38,385	42,100	55,605
Operating loss	(27,542)	(20,118)	(52,517)
Change in fair value of derivatives and warrants	1,304	(228)	3,963
Gain on sale of minority interests	325	3,092	0
Interest expense, net	(383)	(1,037)	(1,882)
Other income (expense), net	65	(2,457)	1,596
Loss before income tax expense (benefit)	(26,231)	(20,748)	(48,840)
Income tax expense (benefit)	1,142	2,391	(184)
Net loss	$ (27,373)	$ (23,139)	$ (48,656)
Net loss per common share
Basic (in dollars per share)	$ (1.98)	$ (1.76)	$ (5.74)
Diluted (in dollars per share)	$ (1.98)	$ (1.76)	$ (5.74)
Weighted average number of common shares outstanding
Basic (in shares)	13,804	13,178	8,477
Diluted (in shares)	13,804	13,178	8,477

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (27,373)	$ (23,139)	$ (48,656)
Other comprehensive (loss) gain, net of tax:
Foreign currency translation (losses) gains	(1,163)	968	(2,147)
Total other comprehensive (loss) gain, net of tax	(1,163)	968	(2,147)
Comprehensive loss	$ (28,536)	$ (22,171)	$ (50,803)

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	At-the-market offering	At-the-market offering Common Stock	At-the-market offering Additional Paid-in Capital	At-the-market offering Accumulated Other Comprehensive Income (Loss)	Private placement	Private placement Common Stock	Private placement Additional Paid-in Capital	Private placement Accumulated Other Comprehensive Income (Loss)
Balance at Mar. 31, 2014	$ 112,259	$ 79	$ 967,100	$ (370)	$ 1,839	$ (856,389)
Balance (in shares) at Mar. 31, 2014		7,893
Issuance of common stock - ESPP	124	$ 0	124		0
Issuance of common stock - ESPP (in shares)		17
Issuance of common stock - restricted shares	0	$ 3	(3)
Issuance of common stock - restricted shares (in shares)		301
Stock-based compensation expense	5,936		5,936		0
Issuance of stock for 401(k) match	392	$ 0	392		0
Issuance of stock for 401(k) match (in shares)		35
Issuance of common stock							$ 5,839	$ 4	$ 5,835	$ 0	$ 5,225	$ 9	$ 5,216	$ 0
Issuance of common stock (in shares)								375				909
Issuance of common stock to settle liabilities	1,323	$ 1	1,322		0
Issuance of common stock to settle liabilities (in shares)		94
Reverse stock split	(1)		(1)
Repurchase of treasury stock	(401)			(401)	0
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 (in shares) at Mar. 31, 2015		9,624
Issuance of common stock - ESPP	30	$ 0	30		0
Issuance of common stock - ESPP (in shares)		8
Issuance of common stock - restricted shares	0	$ 4	(4)
Issuance of common stock - restricted shares (in shares)		409
Stock-based compensation expense	3,248		3,248		0
Issuance of stock for 401(k) match	377	$ 1	376		0
Issuance of stock for 401(k) match (in shares)		66
Issuance of common stock	22,282	$ 40	22,242		0
Issuance of common stock (in shares)		4,000
Repurchase of treasury stock	(110)			(110)	0
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 (in shares) at Mar. 31, 2016		14,107
Issuance of common stock - restricted shares	0	$ 2	(2)
Issuance of common stock - restricted shares (in shares)		174
Stock-based compensation expense	2,892		2,892
Issuance of stock for 401(k) match	284	$ 0	284
Issuance of stock for 401(k) match (in shares)		53
Issuance of common stock	2,527	$ 4	2,523
Issuance of common stock (in shares)		380
Repurchase of treasury stock	(490)			(490)
Cumulative translation adjustment	(1,163)				(1,163)
Net loss	(27,373)					(27,373)
Balance at Mar. 31, 2017	$ 60,226	$ 147	$ 1,017,510	$ (1,371)	$ (503)	$ (955,557)
Balance (in shares) at Mar. 31, 2017		14,714

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss	$ (27,373)	$ (23,139)	$ (48,656)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	7,519	7,972	9,554
Stock-based compensation expense	2,892	3,248	5,936
Impairment of minority interest investments	0	746	3,464
Provision for excess and obsolete inventory	1,615	2,713	1,386
Write-off prepaid taxes	0	289	0
Gain on sale from minority interest investments	(325)	(3,092)	0
Loss from minority interest investments	0	356	743
Change in fair value of derivatives and warrants	(1,304)	228	(3,963)
Reversal of Catlin legal costs	0	0	(2,220)
Non-cash interest expense	156	359	566
Other non-cash items	(940)	1,462	(2,436)
Changes in operating asset and liability accounts:
Accounts receivable	11,143	(9,318)	(2,677)
Inventory	(815)	(782)	(1,887)
Prepaid expenses and other current assets	2,729	5,608	(2,330)
Accounts payable and accrued expenses	(7,938)	1,543	5,579
Deferred revenue	1,426	7,248	4,265
Net cash used in operating activities	(11,215)	(4,559)	(32,676)
Cash flows from investing activities:
Purchase of property, plant and equipment	(656)	(1,201)	(737)
Proceeds from the sale of property, plant and equipment	29	47	18
Change in restricted cash	431	2,669	2,248
Proceeds from sale of minority interests	325	3,092	0
Change in other assets	63	266	280
Net cash provided by investing activities	192	4,873	1,809
Cash flows from financing activities:
Employee taxes paid related to net settlement of equity awards	(490)	(110)	(401)
Proceeds from the issuance of debt, net of expenses	0	0	1,422
Repayment of debt	(3,167)	(4,000)	(7,295)
Proceeds from ATM sales, net	2,527	0	5,839
Proceeds from public equity offering, net	0	22,282	9,094
Proceeds from exercise of employee stock options and ESPP	0	30	124
Net cash (used in) provided by financing activities	(1,130)	18,202	8,783
Effect of exchange rate changes on cash and cash equivalents	(393)	324	(540)
Net (decrease)/increase in cash and cash equivalents	(12,546)	18,840	(22,624)
Cash and cash equivalents at beginning of year	39,330	20,490	43,114
Cash and cash equivalents at end of year	26,784	39,330	20,490
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	992	1,723	362
Issuance of common stock to settle liabilities	399	377	1,715
Cash paid for interest	$ 280	$ 709	$ 1,362

Nature of the Business and Operations and Liquidity	12 Months Ended
Nature of the Business and Operations and Liquidity	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of the Business and Operations and Liquidity	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, 2017, the Company had an accumulated deficit of $955.6 million. In addition, the Company has experienced recurring negative operating cash flows. At March 31, 2017, the Company had cash and cash equivalents of $26.8 million. Cash used in operations for the year ended March 31, 2017 was $11.2 million. From April 1, 2011 through the date of this filing, the Company has reduced its global workforce substantially, including an 8% reduction in force, primarily affecting employees in its Devens, Massachusetts facility, effective April 4, 2017. The Company has taken actions to consolidate certain business operations to reduce facility costs. As of March 31, 2017, the Company had a global workforce of 354 persons. The Company plans to closely monitor its expenses and, if required, expects to further reduce operating costs and capital spending to enhance liquidity. The Company expects to incur restructuring charges of $1.5 million to $2.0 million in cash severance expenses in the first quarter of fiscal 2017, in connection with the workforce reduction. Over the last several years, the Company has entered into several debt and equity financing arrangements in order to enhance liquidity. During the fiscal years ended March 31, 2013 through 2017, the Company generated aggregate cash flows from financing activities of $69.9 million, including net proceeds of $2.5 million during the three months ended March 31, 2017 from the Company's At Market Issuance Sales Agreement ("ATM") with FBR Capital Markets & Co. In addition, on May 10, 2017, the Company completed an additional equity offering, which generated net proceeds of approximately $14.7 million, after deducting underwriting discounts and commissions and estimated offering expenses payable by the Company. The Company terminated the ATM in conjunction with this equity offering. See Note 9, “Debt”, Note 12 “Stockholders’ Equity”, and Note 19, "Subsequent Events" for further discussion of these financing arrangements. The Company believes that it is in compliance with the covenants and restrictions included in the agreements governing its debt arrangements as of March 31, 2017. 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. The Company believes based on the information presented above, and its annual management assessment, that it has sufficient liquidity to fund its operations, capital expenditures and scheduled cash payments under its debt obligations to meet the liquidity needs for the next twelve months following the issuance of the financial statements. 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, 2017

Accounting Policies [Abstract]

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, 2017, Inox, accounted for approximately 52%, and SSE plc for approximately 17% of the Company’s total receivable balance, with no other customer accounting for greater than 10% of the balance. 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. 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 net realizable value 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, 2017 and 2016, the Company recorded inventory reserves of approximately $1.6 million and $2.7 million, respectively, based on evaluating its ending inventory on hand for excess quantities and obsolescence. For the fiscal years ended March 31, 2017, 2016, and 2015, the Company recorded benefits of $1.4 million, $5.0 million, and $8.0 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.

On April 3, 2017, the Board of Directors approved a plan to reduce the Company's global workforce by approximately 8%, effective April 4, 2017 primarily in its Devens, Massachusetts facility. The Board of Directors also approved a move from the Company's currently owned 355,000 square-foot facility in Devens, Massachusetts to a smaller facility better suited for its 2G wire process and systems manufacturing. Since the restructuring activities impacted its Superconductor and Corporate assets group, the Company concluded that there were indicators of potential impairment of its long-lived assets that required further analysis for these assets groups as of March 31, 2017. The Company conducted assessments of the recoverability of these assets by comparing the carrying value of the assets to the pre-tax undiscounted cash flows estimated to be generated by those assets over their remaining book useful lives. Based on the calculations performed by management, the sum of the undiscounted cash flows forecasted to be generated by certain assets were less than the carrying value of those assets. Therefore, there were indicators that certain of its assets were impaired and the Company performed additional analysis. An evaluation of the level of impairment was made by comparing the fair value of the definite long-lived tangible and intangible assets of its reporting units against their carrying values.

The fair values for the impacted property and equipment were based on what the Company could reasonably expect to sell each asset for from the perspective of a market participant. The determination of the fair value of its property and equipment includes estimates and judgments regarding marketability and ultimate sales price of individual assets. The Company utilized market data and approximations from comparable analyses to arrive at the fair value of the impacted property and equipment. The fair values of the amortizable intangible assets related to core technology and trade names were determined using primarily the relief-from-royalty method over the estimated economic lives of these assets from a perspective of a market participant. During the fiscal year ended March 31, 2017, the Company determined that the long-lived assets for the Superconductor and Corporate asset groups were not impaired as the estimated fair values exceeded the carrying values.

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 year ended March 31, 2015, the Company recorded an impairment charge of $3.5 million on its investment in Blade Dynamics. Both of these minority investments have been sold as of March 31, 2017. 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 $0.9 million were received from these customers during the fiscal year ended March 31, 2017, 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 its 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 know-how, 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 know-how 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. The Company 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 that the know-how to manufacture the electrical control systems has been fully transferred. The Company is deferring 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. The Company 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 fiscal 2017 and has an option to continue the joint development through fiscal 2018. The Company is recording 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 comprised of a current and a deferred portion. The current income tax provision is calculated as the estimated taxes payable or refundable on tax returns for the current year. The deferred income tax provision is calculated for the estimated future tax effects attributable to temporary differences and carry-forwards using expected tax rates in effect in the years during which the differences are expected to reverse.

Deferred income taxes are recognized for the tax consequences in future years of differences between the tax bases of assets and liabilities and their financial reporting amounts at each fiscal year end based on enacted tax laws and statutory tax rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce net deferred tax assets to the amount expected to be realized. The Company has provided a valuation allowance against its U.S. and certain 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 its 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, 2017 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, 2017 was $2.1 million resulting in the recording of a $0.7 million net deferred federal and state income tax liability. See Note 11, “Income Taxes,” for further information regarding its 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.

The Company's adoption of ASU 2016-09 Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting also resulted in the prospective classification of excess tax benefits as cash flows from operating activities in the same manner as other cash flows related to income taxes within the consolidated statements of cash flows. Based on the prospective method of adoption chosen, the classification of excess tax benefits within the consolidated statements of cash flows for prior periods presented has not been adjusted to reflect the change.

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, 2017, 2016, and 2015, common equivalent shares of 1,538,418, 1,552,959, and 1,567,352, 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, 2017, 2016, and 2015 (in thousands except per share amounts):



	Fiscal year ended March 31,
	2017			2016			2015
Numerator:
Net loss	$	(27,373	)	$	(23,139	)	$	(48,656	)
Denominator:
Weighted-average shares of common stock outstanding	14,231			13,295			8,559
Weighted-average shares subject to repurchase	(427		)	(117		)	(82		)
Shares used in per-share calculation ― basic	13,804			13,178			8,477
Shares used in per-share calculation ― diluted	13,804			13,178			8,477
Net loss per share ― basic	$	(1.98	)	$	(1.76	)	$	(5.74	)
Net loss per share ― diluted	$	(1.98	)	$	(1.76	)	$	(5.74	)

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 $0.1 million, $(2.3) million, and $2.8 million for the fiscal years ended March 31, 2017, 2016 and 2015, 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, 2018 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.

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, short-term debt, accounts payable, and accrued expenses due to their short nature approximate fair value at March 31, 2017 and 2016. The estimated fair values have been determined through information obtained from market sources and management estimates. The fair value for the warrant arrangements has 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, 2017

Fair Value Disclosures [Abstract]

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, 2017.

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, 2017 and 2016 (in thousands):



	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2017:
Assets:
Cash equivalents	$	14,105	$	14,105	$	—	$	—
Derivative liabilities:
Warrants	$	1,923	$	—	$	—	$	1,923

	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2016:
Assets:
Cash equivalents	$	16,040	$	16,040	$	—	$	—
Derivative liabilities:
Warrants	$	3,227	$	—	$	—	$	3,227

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, 2016	$	3,227
Mark to market adjustment	(1,304		)
Balance at March 31, 2017	$	1,923

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

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, 2017

Receivables [Abstract]

Accounts Receivable

Accounts receivable at March 31, 2017 and March 31, 2016 consisted of the following (in thousands):



	March 31, 2017			March 31, 2016
Accounts receivable (billed)	$	7,436		$	18,089
Accounts receivable (unbilled)	574			1,229
Less: Allowance for doubtful accounts	(54		)	(54		)
Accounts receivable, net	$	7,956		$	19,264

- Definition

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

+ References + Details

Inventory

12 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Inventory

Inventory at March 31, 2017 and March 31, 2016 consisted of the following (in thousands):



	March 31, 2017		March 31, 2016
Raw materials	$	4,263	$	9,665
Work-in-process	426		3,411
Finished goods	8,016		3,215
Deferred program costs	4,757		2,221
Net inventory	$	17,462	$	18,512

The Company recorded inventory write-downs of $1.6 million and $2.7 million for the fiscal years ended March 31, 2017 and 2016, respectively. These write downs were based on evaluating its inventory on hand for excess quantities and obsolescence.

Deferred program costs as of March 31, 2017 and March 31, 2016 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, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

The cost and accumulated depreciation of property and equipment at March 31, 2017 and 2016 are as follows (in thousands):



	March 31, 2017			March 31, 2016
Land	$	3,643		$	3,643
Construction in progress - equipment	601			601
Buildings	34,549			34,549
Equipment and software	73,445			73,659
Furniture and fixtures	1,201			1,215
Leasehold improvements	2,442			3,600
Property, plant and equipment, gross	115,881			117,267
Less accumulated depreciation	(72,443		)	(67,489		)
Property, plant and equipment, net	$	43,438		$	49,778

Depreciation expense was $7.0 million, $7.4 million, and $9.0 million, for the fiscal years ended March 31, 2017, 2016, and 2015, respectively.

Intangible Assets

12 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible assets at March 31, 2017 and 2016 consisted of the following (in thousands):



	2017							2016
	Gross Amount		Accumulated Amortization			Net Book Value		Gross Amount		Accumulated Amortization			Net Book Value		Estimated Useful Life
Licenses	$	4,422	$	(4,134	)	$	288	$	4,422	$	(3,739	)	$	683	7
Core technology and know-how	4,806		(4,793		)	13		5,010		(4,839		)	171		5-10
Intangible assets	$	9,228	$	(8,927	)	$	301	$	9,432	$	(8,578	)	$	854

The Company recorded intangible amortization expense of $0.6 million, $0.6 million, and $0.6 million for the fiscal years ended March 31, 2017, 2016, and 2015, respectively.

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



Fiscal years ending March 31,	Total
2018	301
Total	$	301

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



	March 31,
	2017		2016
Intangible assets by geography:
U.S.	$	301	$	854
Total	$	301	$	854

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



	March 31,
	2017		2016
Intangible assets by business segments:
Grid	301		854
Total	$	301	$	854

Accounts Payable and Accrued Expenses

12 Months Ended

Mar. 31, 2017

Payables and Accruals [Abstract]

Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses at March 31, 2017 and March 31, 2016 consisted of the following (in thousands):



	March 31, 2017		March 31, 2016
Accounts payable	$	3,207	$	5,837
Accrued inventories in-transit	313		1,908
Accrued other miscellaneous expenses	2,240		3,003
Accrued compensation	5,042		7,526
Income taxes payable	1,344		1,281
Accrued warranty	2,344		3,601
Total	$	14,490	$	23,156

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,
	2017			2016
Balance at beginning of period	$	3,601		$	3,934
Change in accruals for warranties during the period	1,219			1,865
Settlements during the period	(2,476		)	(2,198		)
Balance at end of period	$	2,344		$	3,601

Debt	12 Months Ended
Debt	Mar. 31, 2017
Debt Disclosure [Abstract]
Debt	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 bore 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 repaid the Term Loan B in equal monthly installments ending on November 1, 2016, when the loan was repaid in full. The Company paid an end of term fee of $0.5 million upon the maturity of the Term Loan B, which had been accrued at inception of the loan with a corresponding amount recorded into the debt discount. In addition, the Company incurred $0.2 million of legal and origination costs at the inception of the loan, 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 C is also referred to as the “Term Loan”. The Term Loan C also bears the same interest rate as the Term Loan B, which increased to 11.25% effective March 16, 2017. 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 a mandatory prepayment feature that 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 principle balances on the Term Loan C. 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 canceled 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 was amortized into interest expense over the term of the Term Loan B using the effective interest method. During the years ended March 31, 2017 and 2016, the Company recorded non-cash interest expense for amortization of the debt discount related to the Term Loan B of less than $0.1 million and $0.2 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, 2017 and 2016, the Company recorded non-cash interest expense for amortization of the debt discount related to the Term Loan C of $0.1 million. The Term Loan is 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 Loan contains 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 then outstanding term loans. As of March 31, 2017, the Minimum Threshold was $1.5 million. The events of default under the Term Loan 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 Loan. Interest expense for the fiscal years ended March 31, 2017, 2016 and 2015, was $0.4 million, $1.0 million and $1.7 million, respectively, which included $0.2 million, $0.4 million and $0.5 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. Although the Company believes that it is in compliance with the covenants and restrictions under the Term Loan as of March 31, 2017, there can be no assurance that the Company will remain in compliance until the maturity of the Term Loan.

Warrants and Derivative Liabilities

12 Months Ended

Mar. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

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 $15.70 per share, after giving effect to certain price-based and other anti-dilution adjustments including the sale of common stock under the ATM entered into in January 2017. See Note 12, "Stockholders Equity" for further discussion. 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 16	2017	2016	2016	2016
Risk-free interest rate	0.91%	0.56%	0.59%	0.48%
Expected annual dividend yield	—	—	—	—
Expected volatility	44.12%	58.04%	70.50%	76.30%
Term (years)	0.51	0.76	1.01	1.26
Fair value	$—	$0.1 million	$0.2 million	$0.4 million

	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,	March 31,
Fiscal Year 14	2015	2014	2014	2014	2014
Risk-free interest rate	0.73%	1.00%	1.07%	0.98%	1.11%
Expected annual dividend yield	—	—	—	—	—
Expected volatility	70.42%	72.38%	76.20%	83.50%	80.99%
Term (years)	2.51	2.76	3.01	3.26	3.51
Fair value	$0.3 million	$0.5 million	$1.5 million	$2.3 million	$2.2 million

The Company recorded a net gain, resulting from the decrease in the fair value of the Exchanged Warrant, of $0.4 million in the fiscal year ended March 31, 2017. 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, of $1.9 million to change in fair value of derivatives and warrants in the fiscal years ended March 31, 2016 and 2015, 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 exercise price of $9.38 per share, subject to certain price-based and other anti-dilution adjustments, including sales of common stock under the ATM entered into in January 2017, and expires on June 30, 2020. See Note 12, "Stockholders Equity" for further discussion. 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 16	2017	2016	2016	2016
Risk-free interest rate	1.55%	1.57%	0.97%	0.86%
Expected annual dividend yield	—	—	—	—
Expected volatility	66.51%	67.28%	67.98%	68.34%
Term (years)	3.25	3.50	3.75	4.00
Fair value	$0.2 million	$0.2 million	$0.2 million	$0.3 million

	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, 2017, 2016 and 2015, respectively.

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 exercise price equal to $9.33 per share, subject to certain price-based and other anti-dilution adjustments, including sales of common stock under the ATM entered into in January 2017, and expires on November 13, 2019. See Note 12, "Stockholders Equity" for further discussion. 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 16	2017	2016	2016	2016
Risk-free interest rate	1.41%	1.43%	0.93%	0.77%
Expected annual dividend yield	—	—	—	—
Expected volatility	66.53%	69.31%	68.96%	70.01%
Term (years)	2.62	2.87	3.12	3.37
Fair value	$1.8 million	$2.3 million	$2.3 million	$3.2 million

	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 gain, resulting from a decrease in the fair value of the November 2014 Warrant, of $0.8 million, a net loss, resulting from an increase in the fair value of the November 2014 Warrant, of $0.1 million, and a net gain, of $1.8 million to change in fair value of derivatives and warrants in the fiscal years ended March 31, 2017, 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Income Taxes

12 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

Loss before income taxes for the fiscal years ended March 31, 2017, 2016, and 2015 are provided in the table as follows (in thousands):



	Fiscal years ended March 31,
	2017			2016			2015
Loss before income tax expense:
U.S.	$	(31,664	)	$	(29,436	)	$	(40,277	)
Foreign	5,433			8,688			(8,563		)
Total	$	(26,231	)	$	(20,748	)	$	(48,840	)

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



	Fiscal years ended March 31,
	2017			2016			2015
Current
Federal	$	765		$	459		$	47
State	—			—			—
Foreign	619			1,950			(274		)
Total current	1,384			2,409			(227		)

Deferred
Federal	60			(18		)	43
State	—			—			—
Foreign	(302		)	—			—
Total deferred	(242		)	(18		)	43

Income tax (benefit) expense	$	1,142		$	2,391		$	(184	)

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,
	2017		2016		2015
Statutory federal income tax rate	(34	)%	(34	)%	(34	)%
State income taxes, net of federal benefit	—		1		2
Deemed dividend and dividends paid	20		5		1
Foreign income tax rate differential	(1	)	5		6
Stock options	—		1		1
Nondeductible expenses	—		—		1
Research and development tax credit	(2	)	(5	)	—
Deferred warrants	(2	)	—		(3	)
Reversal of uncertain tax benefits	—		—		(6	)
True-up of NOLs	(40	)	19		—
Settlement of intercompany balances	—		(9	)	—
Nondeductible foreign currency exchange remeasurement loss	—		10		—
Valuation allowance	63		18		32
Effective income tax rate	4	%	11	%	—	%

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



	March 31, 2017			March 31, 2016
Deferred tax assets:
Net operating loss carryforwards	$	297,961		$	281,098
Research and development and other tax credit carryforwards	11,965			11,878
Accruals and reserves	26,222			28,088
Fixed assets and intangible assets	2,250			2,393
Other	12,454			14,494
Gross deferred tax assets	350,852			337,951
Valuation allowance	(315,092		)	(301,393		)
Total deferred tax assets	35,760			36,558

Deferred tax liabilities:
Intercompany debt	(25,841		)	(27,117		)
Other	(9,637		)	(9,408		)
Total deferred tax liabilities	(35,478		)	(36,525		)
Net deferred tax asset	$	282		$	33

In March 2016, the FASB issued Accounting Standards Update No. 2016-09, Compensation- Stock Compensation: Improvements to Employee Share-Based Payment Accounting. The guidance simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification of excess tax benefits in the consolidated statements of cash flows. This amendment is effective for annual periods beginning after December 15, 2016 and early adoption is permitted. The Company elected to early adopt the new guidance in the fourth quarter of fiscal 2016 which requires them to reflect any adjustments as of April 1, 2016, the beginning of the annual period that includes the interim period of adoption. The Company has not changed the way it accounts for forfeitures. Prior to April 1, 2016, the Company recognized the excess tax benefits of stock-based compensation expense as additional paid-in capital ("APIC"), and tax deficiencies of stock-based compensation expense in the income tax provision or as APIC to the extent that there were sufficient recognized excess tax benefits previously recognized. As a result of the prior guidance that the excess tax benefits reduce taxes payable prior to being recognized as an increase in capital, the Company had not recognized certain deferred tax assets (all tax attributes such as loss ) that could be attributed to tax deductions related to equity compensation in excess of compensation recognized for financial reporting. Effective April 1, 2016, the Company early adopted a change in accounting policy in accordance with ASU 2016-09 to account for excess tax benefits and tax deficiencies as income tax expense or benefit, treated as discrete items in the reporting period in which they occur, and to recognize previously unrecognized deferred tax assets that arose directly from (or the use of which was postponed by) tax deductions related to equity compensation in excess of compensation recognized for financial reporting. No prior periods were restated as a result of this change in accounting policy as the Company previously maintained a valuation allowance against its deferred tax assets that could be attributed to equity compensation in excess of compensation recognized for financial reporting. As a result of the early adoption of ASU 2016-09, the Company recognized an increase to their deferred tax asset of $18.0M offset by an increase in the Company’s valuation allowance. There was no impact to the Company’s financial statements as a result of the adoption

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. During the year ended March 31, 2017, the Company’s valuation allowance increased by approximately $13.7M, primarily due to the increase in the Company’s net operating loss. 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.

At March 31, 2017, the Company had aggregate net operating loss carryforwards in the U.S. for federal and state income tax purposes of approximately $798.0 million and $143.0 million, respectively, which expire in the years ending March 31, 2018 through 2037. Included in the U.S. net operating loss is $3.7 million of acquired losses from Power Quality Systems, Inc. Research and development and other tax credit carryforwards amounting to approximately $9.5 million and $3.2 million are available to offset federal and state income taxes, respectively, and will expire in the years ending March 31, 2018 through 2037.

At March 31, 2017, the Company had aggregate net operating loss carryforwards for its Austrian subsidiary, AMSC Austria GmbH, of approximately $37.1 million which can be carried forward indefinitely subject to certain annual limitations. At March 31, 2017, the Company had aggregate net operating loss carryforwards for its Chinese operation of approximately $17.9 million, which can be carried forward for five years and begin to expire December 31, 2017. 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 plans to conduct a study during fiscal 2017 as a result of the May 2017 equity offering to determine whether Section 382 could limit the use of its carryforwards in this manner.

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, 2017 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, 2017 was $2.1 million resulting in the recording of a $0.7 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, 2017. The Company did not have any gross unrecognized tax benefits at March 31, 2017 or 2016.

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.

There were no reversals of uncertain tax positions in the years ended March 31, 2017 and 2016. During the fiscal period ended March 31, 2015, the Company reversed uncertain tax positions of $1.1 million.

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 were examined with no material exceptions. Although the 2013 and 2014 tax years in China were audited, they remain subject to further review until the statute of limitations has expired. The statute of limitations in China for the tax authorities to audit is generally three years. Tax filings in China for calendar years 2008 through 2012 and 2015 through 2016 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, 2017

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Stock-Based Compensation Plans

As of March 31, 2017, 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”). 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, 2017, 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 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, 2017, the 2007 Plan had 1,405,110 shares and the 2007 Director Plan had 150,802 shares available for future issuance.

Stock-Based Compensation

The components of employee stock-based compensation for the years ended March 31, 2017, 2016 and 2015 were as follows (in thousands):



	Fiscal years ended March 31,
	2017		2016		2015
Stock options	$	323	$	663	$	1,851
Restricted stock and stock awards	2,569		2,574		4,063
Employee stock purchase plan	—		11		22
Total stock-based compensation expense	$	2,892	$	3,248	$	5,936

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 $0.4 million for the fiscal year ended March 31, 2017. This expense will be recognized over a weighted-average expense period of approximately 1.9 years. The total unrecognized compensation cost for unvested outstanding restricted stock was $1.8 million for the fiscal year ended March 31, 2017. This expense will be recognized over a weighted-average expense period of approximately 1.3 years.

The following table summarizes employee stock-based compensation expense by financial statement line item for the fiscal years ended March 31, 2017, 2016 and 2015 (in thousands):



	Fiscal years ended March 31,
	2017		2016		2015
Cost of revenues	$	185	$	274	$	719
Research and development	214		418		1,728
Selling, general and administrative	2,493		2,556		3,489
Total	$	2,892	$	3,248	$	5,936

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



	Options / Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (thousands)
Outstanding at March 31, 2016	366,549		$	83.39
Granted	9,703		6.80
Exercised	—		—
Canceled/forfeited	(24,244	)	107.26
Outstanding at March 31, 2017	352,008		$	79.63	5.1	$	0.6
Exercisable at March 31, 2017	282,005		$	96.09	5.0	$	—
Fully vested and expected to vest at March 31, 2017	347,256		$	80.54	4.5	$	0.5

There were 9,703 stock options granted during the fiscal year ended March 31, 2017 at a weighted average grant date fair value of $4.06 per share. There were no stock options granted during the fiscal year ended March 31, 2016 and the weighted-average grant-date fair value of stock options granted during the fiscal year ended March 31, 2015 was $10.18 per share. 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, 2017, 2016 and 2015 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, 2017, 2016, and 2015 are as follows:



	Fiscal years ended March 31,
	2017		2016	2015
Expected volatility	67.6	%	N/A	85.5	%
Risk-free interest rate	1.3	%	N/A	1.9	%
Expected life (years)	5.7		N/A	5.9
Dividend yield	None		N/A	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, 2017:



	Shares		Weighted Average Grant Date Fair Value		Intrinsic Aggregate Value (thousands)
Outstanding at March 31, 2016	482,844		$	9.62
Granted	171,000		10.23
Vested	(228,919	)	10.51
Forfeited	—		—
Outstanding at March 31, 2017	424,925		$	9.40	$	2,915

The total fair value of restricted stock that was granted during the fiscal years ended March 31, 2017, 2016 and 2015 was $1.7 million, $2.6 million, and $5.6 million, respectively. The total fair value of restricted stock that vested during the fiscal years ended March 31, 2017, 2016 and 2015 was $2.3 million, $1.7 million, $3.1 million, respectively.

There were no performance-based restricted stock shares awarded during the fiscal years ended March 31, 2017 and 2016, respectively. The restricted stock awarded during the fiscal year ended March 31, 2015 includes approximately 38,021 shares of performance-based restricted stock, which would vest upon achievement of certain financial performance measurements. Included in the table above are 3,333 shares of service-based restricted stock units outstanding, which are expected to vest during the first quarter of fiscal 2017.

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.

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. As of March 31, 2017, the ESPP had 300,013 shares available for future issuance. The Company recognized no compensation expense for the fiscal year ended March 31, 2017, compensation expense of less than $0.1 million during the year fiscal ended March 31, 2016 and $0.1 million for the fiscal years ended March 31, 2015, related to the ESPP.

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.

ATM Arrangement

On January 27, 2017, the Company entered into an ATM arrangement, pursuant to which, the Company could, at its discretion, sell up to $10.0 million of the Company’s common stock through its sales agent, FBR. Sales of common stock made under the ATM were made pursuant to the prospectus supplement dated January 27, 2017, which supplements the prospectus dated October 1, 2014, included in the shelf registration statement that AMSC filed with the Securities and Exchange Commission (“SEC”) on September 19, 2014.

During the year ended March 31, 2017, the Company received net proceeds of $2.5 million, from sales of approximately 379,693 shares of its common stock at an average sales price of approximately $6.79 per share under the ATM. No sales of the Company's common stock were made under the ATM after March 31, 2017. On May 4, 2017, the Company provided to FBR Capital Markets & Co., the sales agent, a notice of termination of the ATM.

- 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

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-Publisher FASB
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Commitments and Contingencies

12 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

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 180,000 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, 2017 were as follows (in thousands):



Fiscal years ended March 31,	Total
2018	$	1,022
2019	315
2020	179
2021	168
Total	$	1,684

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



	Fiscal years ended March 31,
	2017		2016		2015
Rent expense	$	1,338	$	1,628	$	2,091

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 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 $70 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 $667 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 $174 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 $15 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, 2017, the Company had $0.8 million of restricted cash included in current assets and $0.2 million of restricted cash included in long-term assets. These amounts included in restricted cash primarily represent deposits to secure letters of credit for various supply contracts. These deposits are held in interest bearing accounts.

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	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, 2017, 2016, and 2015, and recorded corresponding charges to additional paid-in capital related to this program.

Minority Investments	12 Months Ended
Minority Investments	Mar. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Minority Investments	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 was received and recorded as a gain during the year ended March 31, 2017.

Restructuring

12 Months Ended

Mar. 31, 2017

Restructuring and Related Activities [Abstract]

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 year ended March 31, 2015, 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, 2015, 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, 2016. 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. There was no restructuring activity in the fiscal year ended March 31, 2017. The Company recorded restructuring charges for severance and other costs of approximately less than $0.1 million and $1.9 million during the fiscal years ended March 31, 2016 and 2015, 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, 2017, 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, 2017. The Company announced an additional restructuring plan on April 4, 2017 (see Note 19, "Subsequent Events" for further discussion).

The following table presents restructuring charges and cash payments during the year ended March 31, 2016 (in thousands):



	Severance pay and benefits			Facility exit and Relocation costs			Total
Accrued restructuring balance at April 1, 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, 2017

Segment Reporting [Abstract]

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 2 business segments are as follows (in thousands):



	Fiscal Years Ended March 31,
	2017		2016		2015
Revenues:
Wind	$	47,269	$	68,883	$	51,307
Grid	27,926		27,140		19,223
Total	$	75,195	$	96,023	$	70,530



	Fiscal Years Ended March 31,
	2017			2016			2015
Operating loss:
Wind	$	(4,174	)	$	(1,256	)	$	(14,321	)
Grid	(20,476		)	(14,835		)	(26,890		)
Unallocated corporate expenses	(2,892		)	(4,027		)	(11,306		)
Total	$	(27,542	)	$	(20,118	)	$	(52,517	)

Total assets for the two business segments as of March 31, 2017 and March 31, 2016 are as follows (in thousands):



	March 31, 2017		March 31, 2016
Wind	$	18,346	$	34,389
Grid	31,060		36,255
Corporate assets	50,838		64,674
Total	$	100,244	$	135,318

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 $2.9 million, $3.2 million, and $5.9 million, in the fiscal years ended March 31, 2017, 2016, and 2015, respectively, and restructuring and impairment charges of $0.8 million and, $5.4 million, for the fiscal years ended March 31, 2016, and 2015, respectively.

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



	Fiscal years ended March 31,
	2017		2016		2015
India	$	44,243	$	59,640	$	39,314
U.S.	16,224		14,565		9,820
China	2,004		8,455		10,410
Asia Pacific	2,106		5,364		3,788
Africa	1,548		2,697		616
Australia	4,053		2,410		1,653
Europe	3,624		1,775		2,239
Canada	1,393		1,117		2,690
Total	$	75,195	$	96,023	$	70,530

In the fiscal years ended March 31, 2017, 2016, and 2015, 78%, 85%, and 86% of the Company’s revenues, respectively, were recognized from sales outside the United States. The Company maintains operations in Austria, Romania, and the United States and sales and service support centers around the world.

In the fiscal years ended March 31, 2017, 2016 and 2015, Inox accounted for approximately 59%, 62%, and 56% of the Company’s total revenues, respectively.

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



	March 31,
	2017		2016
North America	$	42,699	$	48,685
Europe	602		868
Asia Pacific	137		225
Total	$	43,438	$	49,778

- 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

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-Name Accounting Standards Codification
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+ Details

Quarterly Financial Data (Unaudited)

12 Months Ended

Mar. 31, 2017

Quarterly Financial Data [Abstract]

Quarterly Financial Data (Unaudited)



(In thousands, except per share amount)	For the year ended March 31, 2017:
Three Months Ended	June 30,			September 30,			December 31,			March 31,
	2016			2016			2016			2017
Total revenue	$	13,345		$	18,507		$	27,148		$	16,195
Operating loss	(9,344		)	(7,150		)	(4,060		)	(6,988		)
Net loss	(10,355		)	(7,325		)	(2,768		)	(6,925		)
Net loss per common share—basic	(0.76		)	(0.53		)	(0.20		)	(0.50		)
Net loss per common share—diluted	(0.76		)	(0.53		)	(0.20		)	(0.50		)

	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		)

Subsequent Events	12 Months Ended
Subsequent Events	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 4, 2017, the Company announced that the board of directors had approved a plan to reduce its global workforce by approximately 8%, effective April 4, 2017. The majority of the affected employees were located at the Company's Devens, Massachusetts office location. The purpose of the workforce reduction was to reduce operating expenses to better align with the Company’s current revenues. This workforce reduction, together with fixed cost savings from a more cost-effective facility, and variable cost savings expected to be realized from production volume aligned with the lower headcount, is expected to reduce the Company’s annualized expenses once the savings are fully realized, which is expected to begin to occur in the fiscal quarter ending March 31, 2018. The Company expects to incur restructuring charges of $1.5 million to $2.0 million in cash severance expenses in the fiscal quarter ending June 30, 2017 in connection with the workforce reduction. On May 5, 2017, the Company entered into an underwriting agreement with Oppenheimer & Co. Inc., as representative of the several underwriters named therein, relating to the issuance and sale (the "Offering") of 4.0 million shares of the Company's common stock at a public offering price of $4.00 per share. The net proceeds to the Company from the Offering were approximately $14.7 million, after deducting underwriting discounts and commissions and estimated offering expenses payable by the Company. The Offering closed on May 10, 2017. In addition, the Company has granted the underwriters a 30 day option to purchase up to an additional 600,000 shares of common stock at the public offering price. The Offering was made pursuant to the Company's shelf registration statement on Form S-3 (Registration Statement No. 333-198851) previously filed with and declared effective by the Securities and Exchange Commission (the "SEC") and a prospectus supplement and accompanying prospectus filed with the SEC. 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 other such events to report.

Recent Accounting Pronouncements

12 Months Ended

Mar. 31, 2017

Accounting Changes and Error Corrections [Abstract]

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) and the International Accounting Standards Board (IASB) issued, ASU 2014-09, 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 FASB has subsequently issued the following amendments to ASU 2014-09 which are all effective for annual reporting periods beginning after December 15, 2017.


•	In March 2016 the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations, which clarifies the implementation guidance on principal versus agent considerations.


•	In April 2016 the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, which clarifies certain aspects of identifying performance obligations and licensing implementation guidance.


•	In May 2016 the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow- Scope Improvements and Practical Expedients related to disclosures of remaining performance obligations, as well as other amendments to guidance on collectability, non-cash consideration and the presentation of sales and other similar taxes collected from customers.

•

In December 2016 the FASB issued ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers, which amends certain narrow aspects of the guidance issued in ASU 2014-09 including guidance related to the disclosure of remaining performance obligations and prior-period performance obligations, as well as other amendments to the guidance on loan guarantee fees, contract costs, refund liabilities, advertising costs and the clarification of certain examples.

The Company is currently evaluating the provisions of ASU 2014-09 and its amendments, and assessing the impact the adoption of this guidance will have on its financial position, results of operations and disclosures. The Company anticipates the adoption of this guidance will result in certain changes in the identification of deliverables in its contracts and allocation of transaction price. The Company is required to adopt the new standards in the first quarter of fiscal 2018 using one of two application methods: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the cumulative catch-up transition method). The Company is currently evaluating the available adoption methods.

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. The Company adopted ASU 2014-12 effective April 1, 2016 and concluded that there is no material impact 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 adopted ASU 2014-15 effective March 31, 2017 and concluded there is no material impact 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 adopted ASU 2015-03 effective April 1, 2016 and concluded that there is no material 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 adopted ASU 2015-10 effective April 1, 2016 and concluded that there is no material 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 adopted ASU 2015-11 effective March 31, 2017 and concluded there is no material impact 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 adopted ASU 2015-16 effective April 1, 2016 and concluded that there is no material impact on its consolidated results of operations, financial condition, or cash flow.

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 2016-09, 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 adopted ASU 2016-09 effective April 1, 2016 and concluded that there is no material impact on its current practices.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The amendments in ASU 2016-13 will provide more decision useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The ASU is effective for annual reporting periods beginning after December 15, 2019, including interim periods within that year. The Company is currently evaluating the impact, if any, the adoption of ASU 2016-13 may have on its current practices.

In 2016, the FASB issued the following two ASU's on Statement of Cash Flows (Topic 230). Both amendments are effective for annual reporting periods beginning after December 15, 2017, including interim periods within that year.


•	In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The amendments in ASU 2016-15 will provide more guidance towards the classification of multiple different types of cash flows in order to reduce the diversity in reporting across entities.

•

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The amendments in ASU 2016-18 will explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows.

The Company is currently evaluating the impact, if any, the adoption of ASU 2016-15 and ASU 2016-18 may have on its current practices.

In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory. The amendments in ASU 2016-16 will improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. The ASU is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that year. The Company is currently evaluating the impact, if any, the adoption of ASU 2016-16 may have on its current practices.

In January 2017, the FASB issued ASU 2017-01, Business Combinations. The amendments in ASU 2017-01 will clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The ASU is effective for annual reporting periods beginning after December 15, 2017, including interim periods within those periods. The Company is currently evaluating the impact the adoption of ASU 2017-01 may have on its current practices.

In January 2017, the FASB issued ASU 2017-03, Accounting Changes and Error Corrections (Topic 250) and Investments - Equity Method and Joint Ventures. The amendments in ASU 2017-03 provide additional detail surrounding disclosures required related to adoption of new pronouncements. The ASU is effective for the periods of each related pronouncement. The Company is currently evaluating the impact the adoption of ASU 2017-03 may have on its current practices.

In February 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Non-financial Assets (Subtopic 610-20). The amendments in ASU 2017-05 clarify the scope of Subtopic 610-20, Other Income-Gains and Losses from the Derecognition of Non-financial Assets, and to add guidance for partial sales of non financial assets. Subtopic 610-20, which was issued in May 2014 as a part of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606), provides guidance for recognizing gains and losses from the transfer of non financial assets in contracts with non customers. The Company is currently evaluating the impact the adoption of ASU 2017-05 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=66092750

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=64853466&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=64853466&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=64853466&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=68064558&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=68064558&loc=d3e725-108305

+ Details

Schedule II — Valuation and Qualifying Accounts

12 Months Ended

Mar. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Schedule II — Valuation and Qualifying Accounts

American Superconductor Corporation

Schedule II — Valuation and Qualifying Accounts

(In thousands)



	Balance, Beginning of Year		Additions	Write-offs		Recoveries and Other Adjustments	Balance, End of Year
Allowance for doubtful accounts receivable:
Fiscal year ended March 31, 2017	$	54	—	—		—	$	54
Fiscal year ended March 31, 2016	$	54	—	—		—	$	54
Fiscal year ended March 31, 2015	$	16	54	(16	)	—	$	54

	Balance, Beginning of Year		Additions	Write-offs		Recoveries and Other Adjustments	Balance, End of Year
Deferred tax asset valuation allowance:
Fiscal year ended March 31, 2017	$	301,393	22,580	(8,881	)	—	$	315,092
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

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Mar. 31, 2017

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

Foreign Currency Translation

Risks and Uncertainties

Contingencies

Disclosure of Fair Value of Financial Instruments

Recent Accounting Pronouncements


•	In March 2016 the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations, which clarifies the implementation guidance on principal versus agent considerations.


•	In April 2016 the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, which clarifies certain aspects of identifying performance obligations and licensing implementation guidance.


•	In May 2016 the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow- Scope Improvements and Practical Expedients related to disclosures of remaining performance obligations, as well as other amendments to guidance on collectability, non-cash consideration and the presentation of sales and other similar taxes collected from customers.

•


•	In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The amendments in ASU 2016-15 will provide more guidance towards the classification of multiple different types of cash flows in order to reduce the diversity in reporting across entities.

•

The Company is currently evaluating the impact, if any, the adoption of ASU 2016-15 and ASU 2016-18 may have on its current practices.

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Schedule of Cost and Accumulated Depreciation of Property and Equipment

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

The cost and accumulated depreciation of property and equipment at March 31, 2017 and 2016 are as follows (in thousands):



	March 31, 2017			March 31, 2016
Land	$	3,643		$	3,643
Construction in progress - equipment	601			601
Buildings	34,549			34,549
Equipment and software	73,445			73,659
Furniture and fixtures	1,201			1,215
Leasehold improvements	2,442			3,600
Property, plant and equipment, gross	115,881			117,267
Less accumulated depreciation	(72,443		)	(67,489		)
Property, plant and equipment, net	$	43,438		$	49,778

Schedule of Reconcilliation of Numerator and Denominator for Earnings Per Share

For the fiscal years ended March 31, 2017, 2016, and 2015, common equivalent shares of 1,538,418, 1,552,959, and 1,567,352, 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, 2017, 2016, and 2015 (in thousands except per share amounts):



	Fiscal year ended March 31,
	2017			2016			2015
Numerator:
Net loss	$	(27,373	)	$	(23,139	)	$	(48,656	)
Denominator:
Weighted-average shares of common stock outstanding	14,231			13,295			8,559
Weighted-average shares subject to repurchase	(427		)	(117		)	(82		)
Shares used in per-share calculation ― basic	13,804			13,178			8,477
Shares used in per-share calculation ― diluted	13,804			13,178			8,477
Net loss per share ― basic	$	(1.98	)	$	(1.76	)	$	(5.74	)
Net loss per share ― diluted	$	(1.98	)	$	(1.76	)	$	(5.74	)

Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2017

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, 2017 and 2016 (in thousands):



	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2017:
Assets:
Cash equivalents	$	14,105	$	14,105	$	—	$	—
Derivative liabilities:
Warrants	$	1,923	$	—	$	—	$	1,923

	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2016:
Assets:
Cash equivalents	$	16,040	$	16,040	$	—	$	—
Derivative liabilities:
Warrants	$	3,227	$	—	$	—	$	3,227

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, 2016	$	3,227
Mark to market adjustment	(1,304		)
Balance at March 31, 2017	$	1,923

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

Inventory (Tables)

12 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventory at March 31, 2017 and March 31, 2016 consisted of the following (in thousands):



	March 31, 2017		March 31, 2016
Raw materials	$	4,263	$	9,665
Work-in-process	426		3,411
Finished goods	8,016		3,215
Deferred program costs	4,757		2,221
Net inventory	$	17,462	$	18,512

Property, Plant and Equipment (Tables)

12 Months Ended

Mar. 31, 2017

Property, Plant and Equipment [Abstract]

Schedule of Cost and Accumulated Depreciation of Property and Equipment

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

The cost and accumulated depreciation of property and equipment at March 31, 2017 and 2016 are as follows (in thousands):



	March 31, 2017			March 31, 2016
Land	$	3,643		$	3,643
Construction in progress - equipment	601			601
Buildings	34,549			34,549
Equipment and software	73,445			73,659
Furniture and fixtures	1,201			1,215
Leasehold improvements	2,442			3,600
Property, plant and equipment, gross	115,881			117,267
Less accumulated depreciation	(72,443		)	(67,489		)
Property, plant and equipment, net	$	43,438		$	49,778

Intangible Assets (Tables)

12 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

Intangible assets at March 31, 2017 and 2016 consisted of the following (in thousands):



	2017							2016
	Gross Amount		Accumulated Amortization			Net Book Value		Gross Amount		Accumulated Amortization			Net Book Value		Estimated Useful Life
Licenses	$	4,422	$	(4,134	)	$	288	$	4,422	$	(3,739	)	$	683	7
Core technology and know-how	4,806		(4,793		)	13		5,010		(4,839		)	171		5-10
Intangible assets	$	9,228	$	(8,927	)	$	301	$	9,432	$	(8,578	)	$	854

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
2018	301
Total	$	301

Schedule of Geographic Composition of Goodwill And Intangible Assets

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



	March 31,
	2017		2016
Intangible assets by geography:
U.S.	$	301	$	854
Total	$	301	$	854

Schedule of Business Segment Composition of Intangible Assets

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



	March 31,
	2017		2016
Intangible assets by business segments:
Grid	301		854
Total	$	301	$	854

Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Mar. 31, 2017

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses at March 31, 2017 and March 31, 2016 consisted of the following (in thousands):



	March 31, 2017		March 31, 2016
Accounts payable	$	3,207	$	5,837
Accrued inventories in-transit	313		1,908
Accrued other miscellaneous expenses	2,240		3,003
Accrued compensation	5,042		7,526
Income taxes payable	1,344		1,281
Accrued warranty	2,344		3,601
Total	$	14,490	$	23,156

Schedule of Product Warranty Activity

Product warranty activity was as follows (in thousands):



	Fiscal Years Ended March 31,
	2017			2016
Balance at beginning of period	$	3,601		$	3,934
Change in accruals for warranties during the period	1,219			1,865
Settlements during the period	(2,476		)	(2,198		)
Balance at end of period	$	2,344		$	3,601

Warrants and Derivative Liabilities (Tables)

12 Months Ended

Mar. 31, 2017

Exchanged warrants

Class Of Warrant Or Right [Line Items]

Summary of Key Assumptions Used to Calculate Fair Value

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 16	2017	2016	2016	2016
Risk-free interest rate	0.91%	0.56%	0.59%	0.48%
Expected annual dividend yield	—	—	—	—
Expected volatility	44.12%	58.04%	70.50%	76.30%
Term (years)	0.51	0.76	1.01	1.26
Fair value	$—	$0.1 million	$0.2 million	$0.4 million

	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,	March 31,
Fiscal Year 14	2015	2014	2014	2014	2014
Risk-free interest rate	0.73%	1.00%	1.07%	0.98%	1.11%
Expected annual dividend yield	—	—	—	—	—
Expected volatility	70.42%	72.38%	76.20%	83.50%	80.99%
Term (years)	2.51	2.76	3.01	3.26	3.51
Fair value	$0.3 million	$0.5 million	$1.5 million	$2.3 million	$2.2 million

Hercules warrant

Class Of Warrant Or Right [Line Items]

Summary of Key Assumptions Used to Calculate Fair Value

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 16	2017	2016	2016	2016
Risk-free interest rate	1.55%	1.57%	0.97%	0.86%
Expected annual dividend yield	—	—	—	—
Expected volatility	66.51%	67.28%	67.98%	68.34%
Term (years)	3.25	3.50	3.75	4.00
Fair value	$0.2 million	$0.2 million	$0.2 million	$0.3 million

	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]

Summary of Key Assumptions Used to Calculate Fair Value

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 16	2017	2016	2016	2016
Risk-free interest rate	1.41%	1.43%	0.93%	0.77%
Expected annual dividend yield	—	—	—	—
Expected volatility	66.53%	69.31%	68.96%	70.01%
Term (years)	2.62	2.87	3.12	3.37
Fair value	$1.8 million	$2.3 million	$2.3 million	$3.2 million

	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

Income Taxes (Tables)

12 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Income (Loss) Before Income Taxes

Loss before income taxes for the fiscal years ended March 31, 2017, 2016, and 2015 are provided in the table as follows (in thousands):



	Fiscal years ended March 31,
	2017			2016			2015
Loss before income tax expense:
U.S.	$	(31,664	)	$	(29,436	)	$	(40,277	)
Foreign	5,433			8,688			(8,563		)
Total	$	(26,231	)	$	(20,748	)	$	(48,840	)

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,
	2017			2016			2015
Current
Federal	$	765		$	459		$	47
State	—			—			—
Foreign	619			1,950			(274		)
Total current	1,384			2,409			(227		)

Deferred
Federal	60			(18		)	43
State	—			—			—
Foreign	(302		)	—			—
Total deferred	(242		)	(18		)	43

Income tax (benefit) expense	$	1,142		$	2,391		$	(184	)

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,
	2017		2016		2015
Statutory federal income tax rate	(34	)%	(34	)%	(34	)%
State income taxes, net of federal benefit	—		1		2
Deemed dividend and dividends paid	20		5		1
Foreign income tax rate differential	(1	)	5		6
Stock options	—		1		1
Nondeductible expenses	—		—		1
Research and development tax credit	(2	)	(5	)	—
Deferred warrants	(2	)	—		(3	)
Reversal of uncertain tax benefits	—		—		(6	)
True-up of NOLs	(40	)	19		—
Settlement of intercompany balances	—		(9	)	—
Nondeductible foreign currency exchange remeasurement loss	—		10		—
Valuation allowance	63		18		32
Effective income tax rate	4	%	11	%	—	%

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, 2017			March 31, 2016
Deferred tax assets:
Net operating loss carryforwards	$	297,961		$	281,098
Research and development and other tax credit carryforwards	11,965			11,878
Accruals and reserves	26,222			28,088
Fixed assets and intangible assets	2,250			2,393
Other	12,454			14,494
Gross deferred tax assets	350,852			337,951
Valuation allowance	(315,092		)	(301,393		)
Total deferred tax assets	35,760			36,558

Deferred tax liabilities:
Intercompany debt	(25,841		)	(27,117		)
Other	(9,637		)	(9,408		)
Total deferred tax liabilities	(35,478		)	(36,525		)
Net deferred tax asset	$	282		$	33

Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2017

Equity [Abstract]

Components of Employee Stock-Based Compensation

The components of employee stock-based compensation for the years ended March 31, 2017, 2016 and 2015 were as follows (in thousands):



	Fiscal years ended March 31,
	2017		2016		2015
Stock options	$	323	$	663	$	1,851
Restricted stock and stock awards	2,569		2,574		4,063
Employee stock purchase plan	—		11		22
Total stock-based compensation expense	$	2,892	$	3,248	$	5,936

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, 2017, 2016 and 2015 (in thousands):



	Fiscal years ended March 31,
	2017		2016		2015
Cost of revenues	$	185	$	274	$	719
Research and development	214		418		1,728
Selling, general and administrative	2,493		2,556		3,489
Total	$	2,892	$	3,248	$	5,936

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:



	Options / Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (thousands)
Outstanding at March 31, 2016	366,549		$	83.39
Granted	9,703		6.80
Exercised	—		—
Canceled/forfeited	(24,244	)	107.26
Outstanding at March 31, 2017	352,008		$	79.63	5.1	$	0.6
Exercisable at March 31, 2017	282,005		$	96.09	5.0	$	—
Fully vested and expected to vest at March 31, 2017	347,256		$	80.54	4.5	$	0.5

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

The weighted average assumptions used in the Black-Scholes valuation model for stock options granted during the fiscal years ended March 31, 2017, 2016, and 2015 are as follows:



	Fiscal years ended March 31,
	2017		2016	2015
Expected volatility	67.6	%	N/A	85.5	%
Risk-free interest rate	1.3	%	N/A	1.9	%
Expected life (years)	5.7		N/A	5.9
Dividend yield	None		N/A	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, 2017:



	Shares		Weighted Average Grant Date Fair Value		Intrinsic Aggregate Value (thousands)
Outstanding at March 31, 2016	482,844		$	9.62
Granted	171,000		10.23
Vested	(228,919	)	10.51
Forfeited	—		—
Outstanding at March 31, 2017	424,925		$	9.40	$	2,915

Commitments and Contingencies (Tables)

12 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Minimum Future Lease Commitments

Minimum future lease commitments at March 31, 2017 were as follows (in thousands):



Fiscal years ended March 31,	Total
2018	$	1,022
2019	315
2020	179
2021	168
Total	$	1,684

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,
	2017		2016		2015
Rent expense	$	1,338	$	1,628	$	2,091

Restructuring (Tables)

12 Months Ended

Mar. 31, 2017

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Charges and Cash Payments

The following table presents restructuring charges and cash payments during the year ended March 31, 2016 (in thousands):



	Severance pay and benefits			Facility exit and Relocation costs			Total
Accrued restructuring balance at April 1, 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, 2017

Segment Reporting [Abstract]

Schedule of Operating Results and Assets of Segments

The operating results for the 2 business segments are as follows (in thousands):



	Fiscal Years Ended March 31,
	2017		2016		2015
Revenues:
Wind	$	47,269	$	68,883	$	51,307
Grid	27,926		27,140		19,223
Total	$	75,195	$	96,023	$	70,530



	Fiscal Years Ended March 31,
	2017			2016			2015
Operating loss:
Wind	$	(4,174	)	$	(1,256	)	$	(14,321	)
Grid	(20,476		)	(14,835		)	(26,890		)
Unallocated corporate expenses	(2,892		)	(4,027		)	(11,306		)
Total	$	(27,542	)	$	(20,118	)	$	(52,517	)

Total assets for the two business segments as of March 31, 2017 and March 31, 2016 are as follows (in thousands):



	March 31, 2017		March 31, 2016
Wind	$	18,346	$	34,389
Grid	31,060		36,255
Corporate assets	50,838		64,674
Total	$	100,244	$	135,318

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,
	2017		2016		2015
India	$	44,243	$	59,640	$	39,314
U.S.	16,224		14,565		9,820
China	2,004		8,455		10,410
Asia Pacific	2,106		5,364		3,788
Africa	1,548		2,697		616
Australia	4,053		2,410		1,653
Europe	3,624		1,775		2,239
Canada	1,393		1,117		2,690
Total	$	75,195	$	96,023	$	70,530

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,
	2017		2016
North America	$	42,699	$	48,685
Europe	602		868
Asia Pacific	137		225
Total	$	43,438	$	49,778

Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Mar. 31, 2017

Quarterly Financial Data [Abstract]

Schedule of Quarterly Financial Data



(In thousands, except per share amount)	For the year ended March 31, 2017:
Three Months Ended	June 30,			September 30,			December 31,			March 31,
	2016			2016			2016			2017
Total revenue	$	13,345		$	18,507		$	27,148		$	16,195
Operating loss	(9,344		)	(7,150		)	(4,060		)	(6,988		)
Net loss	(10,355		)	(7,325		)	(2,768		)	(6,925		)
Net loss per common share—basic	(0.76		)	(0.53		)	(0.20		)	(0.50		)
Net loss per common share—diluted	(0.76		)	(0.53		)	(0.20		)	(0.50		)

	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		)

Nature of the Business and Operations and Liquidity - Additional Information (Detail) $ in Thousands				1 Months Ended	12 Months Ended			60 Months Ended
	May 10, 2017 USD ($)	Apr. 04, 2017	Mar. 24, 2015	Dec. 31, 2015 USD ($)	Mar. 31, 2017 USD ($) employee	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2017 USD ($) employee	Mar. 31, 2014 USD ($)
Description Of Business [Line Items]
Reverse stock split			0.1
Accumulated deficit					$ (955,557)	$ (928,184)		$ (955,557)
Cash and cash equivalents					26,784	39,330	$ 20,490	$ 26,784	$ 43,114
Net cash used in operating activities					$ 11,215	4,559	32,676
Number of workforce persons \| employee					354			354
Cash flows from financing activities					$ (1,130)	18,202	8,783	$ 69,900
Proceeds from ATM sales, net					2,527	$ 0	$ 5,839
Minimum
Description Of Business [Line Items]
Expected severance cost					1,500			1,500
Maximum
Description Of Business [Line Items]
Expected severance cost					$ 2,000			$ 2,000
Inox Wind Limited
Description Of Business [Line Items]
Strategic agreements value				$ 210,000
Supply commitment, extension period				3 years
Inox Wind Limited \| Minimum
Description Of Business [Line Items]
Supply commitment, period				3 years
Inox Wind Limited \| Maximum
Description Of Business [Line Items]
Supply commitment, period				4 years
Subsequent event
Description Of Business [Line Items]
Number of positions eliminated, period percent		8.00%
Common Stock \| Subsequent event
Description Of Business [Line Items]
Proceeds from additional equity offering	$ 14,700

Summary of Significant Accounting Policies - Additional Information (Detail) ft² in Thousands, $ in Millions		1 Months Ended	12 Months Ended
	Apr. 04, 2017	Dec. 31, 2015 USD ($)	Mar. 31, 2017 USD ($) shares	Mar. 31, 2016 USD ($) shares	Mar. 31, 2015 USD ($) shares	Apr. 03, 2017 ft²
Payments received from customers			$ 0.9
Guaranteed annual payments, description			BASF has also agreed to make guaranteed annual payments to the Company through fiscal 2017 and has an option to continue the joint development through fiscal 2018.
Repatriated amount			$ 2.1
Common equivalent shares not included in the calculation of diluted EPS (in shares) \| shares			1,538,418	1,552,959	1,567,352
Net foreign currency transaction and hedging gains (losses)			$ 0.1	$ (2.3)	$ 2.8
Foreign earnings repatriated
Federal and state deferred tax liability			$ 0.7
Tres Amigas
Impairment of minority interest investments				0.7
Blade Dynamics Ltd
Impairment of minority interest investments					$ 3.5
Maximum
Warranty period			3 years
Minimum
Warranty period			1 year
Inox Wind Limited
Strategic agreements value		$ 210.0
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				$ 3.0
Credit concentration risk \| Accounts receivable \| Inox Wind Limited \| Maximum
Risk percentage			52.00%	84.00%
Credit concentration risk \| Accounts receivable \| Scottish and Southern Energy \| Maximum
Risk percentage			17.00%
Subsequent event
Number of positions eliminated, period percent	8.00%
Subsequent event \| Manufacturing facility
Area of facility (in sq ft) \| ft²						355

Summary of Significant Accounting Policies - Estimated Useful Life of Property, Plant and Equipment (Detail)	12 Months Ended
	Mar. 31, 2017
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, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net loss	$ (6,925)	$ (2,768)	$ (7,325)	$ (10,355)	$ (3,363)	$ (2,957)	$ (7,698)	$ (9,121)	$ (27,373)	$ (23,139)	$ (48,656)
Denominator:
Weighted-average shares of common stock outstanding (in shares)									14,231	13,295	8,559
Weighted-average shares subject to repurchase (in shares)									(427)	(117)	(82)
Shares used in per-share calculation ― basic (in shares)									13,804	13,178	8,477
Shares used in per-share calculation ― diluted (in shares)									13,804	13,178	8,477
Net loss per share ― basic (in dollars per share)	$ (0.50)	$ (0.20)	$ (0.53)	$ (0.76)	$ (0.25)	$ (0.22)	$ (0.57)	$ (0.75)	$ (1.98)	$ (1.76)	$ (5.74)
Net loss per share ― diluted (in dollars per share)	$ (0.50)	$ (0.20)	$ (0.53)	$ (0.76)	$ (0.25)	$ (0.22)	$ (0.57)	$ (0.75)	$ (1.98)	$ (1.76)	$ (5.74)

Summary of Significant Accounting Policies - Inventory (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Inventory [Line Items]
Inventory write-down	$ 1,615	$ 2,713	$ 1,386
Inventory Valuation Reserve
Inventory [Line Items]
Benefits recorded for the usage of inventories previously reserved	$ (1,400)	$ (5,000)	$ (8,000)

Fair Value Measurements - Schedule of Assets and Liabilities Carried at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	$ 14,105	$ 16,040
Warrants	1,923	3,227
Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	14,105	16,040
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrants	$ 1,923	$ 3,227

- 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, 2017	Mar. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	$ 3,227
Ending balance	1,923	$ 3,227
Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	3,227	2,999
Mark to market adjustment	(1,304)	228
Ending balance	$ 1,923	$ 3,227

- Definition

+ References + Details

Accounts Receivable - Schedule of Accounts Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Receivables [Abstract]
Accounts receivable (billed)	$ 7,436	$ 18,089
Accounts receivable (unbilled)	574	1,229
Less: Allowance for doubtful accounts	(54)	(54)
Accounts receivable, net	$ 7,956	$ 19,264

Inventory - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 4,263	$ 9,665
Work-in-process	426	3,411
Finished goods	8,016	3,215
Deferred program costs	4,757	2,221
Net inventory	$ 17,462	$ 18,512

Inventory - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Inventory Disclosure [Abstract]
Inventory write-down	$ 1,615	$ 2,713	$ 1,386

Property, Plant and Equipment - Schedule of Cost and Accumulated Depreciation of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 115,881	$ 117,267
Less accumulated depreciation	(72,443)	(67,489)
Property, plant and equipment, net	43,438	49,778
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	601
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	73,445	73,659
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,201	1,215
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 2,442	$ 3,600

Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	$ 9,228	$ 9,432
Intangible assets, Accumulated Amortization	(8,927)	(8,578)
Intangible assets, Net Book Value	301	854
Licenses
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	4,422	4,422
Intangible assets, Accumulated Amortization	(4,134)	(3,739)
Intangible assets, Net Book Value	$ 288	683
Intangible assets, Estimated Useful Life	7 years
Core Technology And Know How
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	$ 4,806	5,010
Intangible assets, Accumulated Amortization	(4,793)	(4,839)
Intangible assets, Net Book Value	$ 13	$ 171
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, 2017	Mar. 31, 2016	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 0.6	$ 0.6	$ 0.6

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

Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Payables and Accruals [Abstract]
Accounts payable	$ 3,207	$ 5,837
Accrued inventories in-transit	313	1,908
Accrued other miscellaneous expenses	2,240	3,003
Accrued compensation	5,042	7,526
Income taxes payable	1,344	1,281
Accrued warranty	2,344	3,601	$ 3,934
Total	$ 14,490	$ 23,156

Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 3,601	$ 3,934
Change in accruals for warranties during the period	1,219	1,865
Settlements during the period	(2,476)	(2,198)
Balance at end of period	$ 2,344	$ 3,601

Debt - Additional Information (Detail) - USD ($)			9 Months Ended	12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Dec. 19, 2014	Nov. 15, 2013	Dec. 31, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 16, 2017	Nov. 01, 2016	Apr. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Amortization of debt discount				$ 156,000	$ 359,000	$ 566,000
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 then outstanding term loans.
Term debt \| Hercules Technology Growth Capital \| FIrst warrants
Debt Instrument [Line Items]
Number of shares received from warrants received to purchase common stock (in shares)	13,927
Fair value of warrants issued	$ 400,000
Term debt \| Hercules Technology Growth Capital \| Second warrants
Debt Instrument [Line Items]
Number of shares received from warrants received to purchase common stock (in shares)	25,641
Fair value of warrants issued	$ 200,000
Term debt \| Hercules Technology Growth Capital \| Hercules warrants
Debt Instrument [Line Items]
Number of shares received from warrants received to purchase common stock (in shares)	58,823
Exercise price (in dollars per share)	$ 11.00			$ 9.38
Term loan B \| Term debt \| Hercules Technology Growth Capital
Debt Instrument [Line Items]
Debt, face amount		$ 10,000,000.0
Net proceeds from debt		$ 9,800,000
Interest rate on loan		11.00%
Debt fee amount								$ 500,000
Legal and origination costs recorded as debt discount											$ 200,000
Term loan B \| Term debt \| Hercules Technology Growth Capital \| Hercules warrants
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs, net	$ 1,000,000
Amortization of debt discount				$ 100,000	200,000
Term loan B \| Term debt \| Hercules Technology Growth Capital \| Prime rate
Debt Instrument [Line Items]
Basis spread that exceeds prime rate, percentage		3.75%
Term loan C \| Term debt \| Hercules Technology Growth Capital
Debt Instrument [Line Items]
Debt, face amount	1,500,000.0
Net proceeds from debt	$ 1,400,000
Interest rate on loan							11.25%
Debt fee amount				100,000
Legal and origination costs recorded as debt discount										$ 100,000
Prepayment feature, use of asset proceeds minimum				1,000,000
Proceeds from additional equity offering			$ 10,000,000
Term loan C \| Term debt \| Hercules Technology Growth Capital \| Hercules warrants
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs, net				300,000
Amortization of debt discount				100,000	100,000
Term loan
Debt Instrument [Line Items]
Amortization of debt discount				200,000	400,000	500,000
Interest expense, debt				400,000	$ 1,000,000	$ 1,700,000
Term loan \| Term debt \| Hercules Technology Growth Capital
Debt Instrument [Line Items]
Covenant terms, unrestricted cash balance requirement, minimum				$ 1,500,000.0
Maximum \| Term loan \| Term debt \| Hercules Technology Growth Capital
Debt Instrument [Line Items]
Covenant terms, unrestricted cash balance requirement, minimum									$ 2,000,000.0

Warrants and Derivative Liabilities - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2013	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Dec. 19, 2014	Nov. 13, 2014	Apr. 04, 2012
Derivative [Line Items]
Change in fair value of derivatives and warrants		$ 1,304	$ (228)	$ 3,963
Hercules warrants
Derivative [Line Items]
Change in fair value of derivatives and warrants		0	0	0
November 2014 warrant
Derivative [Line Items]
Change in fair value of derivatives and warrants		800	100	(1,800)
Common stock units offered (in shares)						909,090
Warrant to purchase one share of common stock (in shares)						0.9
Number of warrants issued to purchase common stock (in shares)						818,181
Sale of stock, price per share (in dollars per share)						$ 9.33
Capital Ventures International \| Exchanged warrants
Derivative [Line Items]
Change in fair value of derivatives and warrants		$ 400	$ 100	$ 1,900
Senior convertible debt \| Capital Ventures International \| Original warrants
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock (in shares)							309,406
Senior convertible debt \| Capital Ventures International \| Exchanged warrants
Derivative [Line Items]
Warrant exercise, waiting period	6 months
Warrant exercise period	5 years
Exercise price (in dollars per share)	$ 15.70
Senior convertible debt \| Capital Ventures International \| Maximum \| Exchanged warrants
Derivative [Line Items]
Beneficial ownership limitation percentage	4.99%
Beneficial ownership, limitation option, percentage	9.99%
Required notification period	61 days
Term debt \| Hercules warrants \| Hercules Technology Growth Capital
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock (in shares)					58,823
Exercise price (in dollars per share)		$ 9.38			$ 11.00

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	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	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
Exchanged warrants
Derivative [Line Items]
Risk-free interest rate		0.91%	0.56%	0.59%	0.48%	0.66%	0.96%	0.64%	0.74%	0.73%	1.00%	1.07%	0.98%	1.11%
Expected annual dividend yield		0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Expected volatility		44.12%	58.04%	70.50%	76.30%	76.76%	76.68%	73.39%	71.61%	70.42%	72.38%	76.20%	83.50%	80.99%
Term (years)		6 months 4 days	9 months 4 days	1 year 4 days	1 year 3 months 4 days	1 year 6 months 4 days	1 year 9 months 4 days	2 years 4 days	2 years 3 months 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
Fair value		$ 0.0	$ 0.1	$ 0.2	$ 0.4	$ 0.4	$ 0.3	$ 0.1	$ 0.2	$ 0.3	$ 0.5	$ 1.5	$ 2.3	$ 2.2
Hercules warrants
Derivative [Line Items]
Risk-free interest rate	1.74%	1.55%	1.57%	0.97%	0.86%	1.08%	1.65%	1.31%	1.63%	1.41%	1.73%
Expected annual dividend yield	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Expected volatility	70.26%	66.51%	67.28%	67.98%	68.34%	70.25%	73.57%	75.32%	72.57%	74.60%	77.43%
Term (years)	5 years 6 months 11 days	3 years 3 months	3 years 6 months	3 years 9 months	4 years	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	$ 0.2	$ 0.3	$ 0.2	$ 0.2	$ 0.1	$ 0.2	$ 0.2	$ 0.2
November 2014 warrant
Derivative [Line Items]
Risk-free interest rate	1.64%	1.41%	1.43%	0.93%	0.77%	0.98%	1.51%	1.17%	1.44%	1.28%	1.61%
Expected annual dividend yield	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Expected volatility	72.86%	66.53%	69.31%	68.96%	70.01%	69.88%	70.02%	73.02%	74.18%	75.96%	78.00%
Term (years)	5 years	2 years 7 months 13 days	2 years 10 months 13 days	3 years 1 month 13 days	3 years 4 months 13 days	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	$ 1.8	$ 2.3	$ 2.3	$ 3.2	$ 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, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
U.S.	$ (31,664)	$ (29,436)	$ (40,277)
Foreign	5,433	8,688	(8,563)
Loss before income tax expense (benefit)	$ (26,231)	$ (20,748)	$ (48,840)

Income Taxes - Schedule of Components of Income Tax Expense (Benefit) Attributable to Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Current, Federal	$ 765	$ 459	$ 47
Current, State	0	0	0
Current, Foreign	619	1,950	(274)
Total current	1,384	2,409	(227)
Deferred, Federal	60	(18)	43
Deferred, State	0	0	0
Deferred, Foreign	(302)	0	0
Total deferred	(242)	(18)	43
Income tax (benefit) expense	$ 1,142	$ 2,391	$ (184)

Income Taxes - Schedule of Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate (Detail)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	(34.00%)	(34.00%)	(34.00%)
State income taxes, net of federal benefit	(0.00%)	1.00%	2.00%
Deemed dividend and dividends paid	20.00%	5.00%	1.00%
Foreign income tax rate differential	(1.00%)	5.00%	6.00%
Stock options	(0.00%)	1.00%	1.00%
Nondeductible expenses	(0.00%)	(0.00%)	1.00%
Research and development tax credit	(2.00%)	(5.00%)	0.00%
Deferred warrants	(2.00%)	0.00%	(3.00%)
Reversal of uncertain tax benefits	(0.00%)	(0.00%)	(6.00%)
True-up of NOLs	(40.00%)	19.00%	(0.00%)
Settlement of intercompany balances	(0.00%)	(9.00%)	(0.00%)
Nondeductible foreign currency exchange remeasurement loss	(0.00%)	10.00%	(0.00%)
Valuation allowance	63.00%	18.00%	32.00%
Effective income tax rate	4.00%	11.00%	(0.00%)

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 297,961	$ 281,098
Research and development and other tax credit carryforwards	11,965	11,878
Accruals and reserves	26,222	28,088
Fixed assets and intangible assets	2,250	2,393
Other	12,454	14,494
Gross deferred tax assets	350,852	337,951
Valuation allowance	(315,092)	(301,393)
Total deferred tax assets	35,760	36,558
Intercompany debt	(25,841)	(27,117)
Other	(9,637)	(9,408)
Total deferred tax liabilities	(35,478)	(36,525)
Net deferred tax asset	$ 282	$ 33

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Apr. 01, 2017
Deferred tax assets	$ 407	$ 96
Valuation allowance	315,092	301,393
Increase in valuation allowance	13,700
Deferred tax asset reflecting the benefit of deductions from the exercise of stock options	13,000
Undistributed earnings available for repatriation	2,100
Reversal of uncertain tax positions	0	$ 0	$ 1,100
Austria
Net operating loss carryforwards	37,100
China
Net operating loss carryforwards	$ 17,900
Net operating loss carryforward period	5 years
Statute of limitations for audit, period	3 years
Federal
Net operating loss carryforwards	$ 798,000
Research and development and other tax credit carryforwards	9,500
State
Net operating loss carryforwards	143,000
Research and development and other tax credit carryforwards	3,200
Foreign earnings repatriated
Federal and state deferred tax liability	700
Power Quality Systems, Inc.
Net operating loss carryforwards	$ 3,700
Accounting Standards Update 2016-09
Deferred tax assets				$ 18,000
Valuation allowance				$ 18,000

Stockholders' Equity - Components of Employee Stock-Based Compensation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2,892	$ 3,248	$ 5,936
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	323	663	1,851
Restricted stock and stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2,569	2,574	4,063
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0	$ 11	$ 22

Stockholders' Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	Apr. 29, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Jan. 27, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period (in shares)		9,703	0
Weighted-average grant-date fair value of stock options granted (in dollars per share)		$ 4.06	$ 10.18
Intrinsic value of exercisable options		$ 0	$ 0	$ 0
Granted (in shares)		171,000
Number of shares cancelled (in shares)		0
Stock-based compensation expense (less than $0.1 million in 2016)		$ 2,892,000	$ 3,248,000	5,936,000
Common stock, shares issued (in shares)		14,713,839	14,107,126
Proceeds from sale of stock		$ 2,527,000	$ 0	5,839,000
Cowen and Company, LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued (in shares)	4,000,000
Sale of stock, price per share (in dollars per share)	$ 6.00
Proceeds from additional equity offering	$ 22,300,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures		$ 400,000
Weighted-average period over which unrecognized compensation expense is expected to be recognized (years)		1 year 10 months 24 days
Stock-based compensation expense (less than $0.1 million in 2016)		$ 323,000	663,000	1,851,000
Restricted stock and stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of restricted stock granted		1,700,000	2,600,000	5,600,000
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures		$ 1,800,000
Weighted-average period over which unrecognized compensation expense is expected to be recognized (years)		1 year 3 months 18 days
Total fair value of restricted stock vested		$ 2,300,000	1,700,000	3,100,000
Stock-based compensation expense (less than $0.1 million in 2016)		$ 2,569,000	$ 2,574,000	$ 4,063,000
Performance-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		0	0	38,021
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares cancelled (in shares)		3,333
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance under the plan (in shares)		300,013
Percentage of purchase discount		15.00%
Stock-based compensation expense (less than $0.1 million in 2016)		$ 0	$ 11,000	$ 22,000
ATM arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, price per share (in dollars per share)		$ 6.79
Sale of stock					$ 10,000,000.0
Number of shares sold (in shares)		379,693
2007 Director stock option plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, in years		2 years
Grant date value of shares granted by option upon election to board		$ 40,000
Total fair value of restricted stock granted		$ 40,000
Number of shares authorized for issuance under the plan (in shares)		150,802
2007 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual life of options, in years		10 years
Vesting period, in years		3 years
Number of shares authorized for issuance under the plan (in shares)		1,405,110
2007 Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, in years		3 years
2007 Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, in years		5 years

Stockholders' Equity - Summary of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,892	$ 3,248	$ 5,936
Cost of Revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	185	274	719
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	214	418	1,728
Selling, General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,493	$ 2,556	$ 3,489

Stockholders' Equity - Summary of Employee and Non-Employee Stock Options Activity (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Outstanding (in shares)	366,549
Options, Granted (in shares)	9,703	0
Options, Exercised (in shares)	0
Options, Canceled/forfeited (in shares)	(24,244)
Options, Outstanding (in shares)	352,008	366,549
Options, Exercisable at March 31, 2016 (in shares)	282,005
Options, Fully vested and expected to vest at March 31, 2016 (in shares)	347,256
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Exercise Price, Outstanding (in dollars per share)	$ 83.39
Weighted-Average Exercise Price, Granted (in dollars per share)	6.80
Weighted-Average Exercise Price, Exercised (in dollars per share)	0.00
Weighted-Average Exercise Price, Cancelled/Forfeited (in dollars per share)	107.26
Weighted-Average Exercise Price, Outstanding (in dollars per share)	79.63	$ 83.39
Weighted-Average Exercise Price, Exercisable at March 31, 2017 (in dollars per share)	96.09
Weighted-Average Exercise Price, Fully vested and expected to vest at March 31, 2017 (in dollars per share)	$ 80.54
Weighted-Average Remaining Contractual Term, Outstanding at March 31, 2016	5 years 20 days
Weighted-Average Remaining Contractual Term, Exercisable at March 31, 2016	5 years 8 days
Weighted-Average Remaining Contractual Term, Fully vested and expected to vest at March 31, 2016	4 years 5 months 20 days
Aggregate Intrinsic Value, Outstanding at March 31, 2017	$ 600
Aggregate Intrinsic Value, Exercisable at March 31, 2017	0	$ 0	$ 0
Aggregate Intrinsic Value, Fully vested and expected to vest at March 31, 2017	$ 500

Stockholders' Equity - Schedule of Weighted Average Assumptions used in Black-Scholes Valuation Model for Stock Options Granted (Detail)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2015
Equity [Abstract]
Expected volatility	67.60%	85.50%
Risk-free interest rate	1.30%	1.90%
Expected life	5 years 8 months 28 days	5 years 10 months 28 days
Dividend yield	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, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, beginning (in shares) \| shares	482,844
Granted (in shares) \| shares	171,000
Vested (in shares) \| shares	(228,919)
Forfeited (in shares) \| shares	0
Outstanding, ending (in shares) \| shares	424,925
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share [Abstract]
Weighted Average Grant Date Fair Value, Outstanding (in dollars per share) \| $ / shares	$ 9.62
Weighted Average Grant Date Fair Value, Granted (in dollars per share) \| $ / shares	10.23
Weighted Average Grant Date Fair Value, Vested (in dollars per share) \| $ / shares	10.51
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) \| $ / shares	0.00
Weighted Average Grant Date Fair Value, Outstanding (in dollars per share) \| $ / shares	$ 9.40
Intrinsic Aggregate Value, Outstanding at March 31, 2017 \| $	$ 2,915

Commitments and Contingencies - Additional Information (Detail) ft² in Thousands, $ in Thousands, ¥ in Millions							12 Months Ended
	Feb. 27, 2012 USD ($)	Feb. 27, 2012 CNY (¥)	Oct. 08, 2011 USD ($)	Oct. 08, 2011 CNY (¥)	Sep. 13, 2011 USD ($)	Sep. 13, 2011 CNY (¥)	Mar. 31, 2011 USD ($)	Mar. 31, 2011 CNY (¥)	Mar. 31, 2017 USD ($) ft²	Mar. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Total space leased, square feet \| ft²									180
Restricted cash included in current assets									$ 795	$ 457
Restricted cash included in long-term assets									$ 165	$ 934
Sinovel Wind Group Co. Ltd.
Loss Contingencies [Line Items]
Sought compensation amount	$ 15,000	¥ 105	$ 174,000	¥ 1,200
Sinovel Wind Group Co. Ltd.
Loss Contingencies [Line Items]
Sought compensation amount					$ 70,000	¥ 485
Value of the undelivered components							$ 667,000	¥ 4,600

Commitments and Contingencies - Schedule of Minimum Future Lease Commitments (Detail) $ in Thousands	Mar. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2018	$ 1,022
2019	315
2020	179
2021	168
Total	$ 1,684

Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Compensation and Retirement Disclosure [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) $ in Thousands		3 Months Ended	12 Months Ended
	Mar. 11, 2016 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($) power_grid	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Schedule Of Equity Method Investments [Line Items]
Proceeds from sale of minority interests			$ 325	$ 3,092	$ 0
Tres Amigas
Schedule Of Equity Method Investments [Line Items]
Number of commonly interconnected power grids \| power_grid			3
Equity method investment, aggregate cost			$ 5,400
Impairment charge on investment				$ 700
Percentage of investment sold	100.00%
Minority share investment sold, amount	$ 600
Proceeds from sale of minority interests		$ 300	$ 300

Restructuring - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring and Related Activities [Abstract]
Employee severance and benefit costs (less than $0.1 and $1.9 million)	$ 0.1	$ 1.9

Restructuring - Schedule of Restructuring Charges and Cash Payments (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2016 USD ($)
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	$ 180
Charges to operations	33
Cash payments	(213)
Accrued restructuring balance	0
Severance pay and benefits
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	180
Charges to operations	(5)
Cash payments	(175)
Accrued restructuring balance	0
Facility exit and Relocation costs
Restructuring Cost And Reserve [Line Items]
Charges to operations	38
Cash payments	$ (38)

Business Segments - Additional Information (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2017 USD ($) segment MW	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments \| segment	2
Stock-based compensation expense	$ 2,892	$ 3,248	$ 5,936
Restructuring and impairments	0	779	5,366
Impairment of minority interest investments	$ 0	$ 746	$ 3,464
Customer concentration risk \| Sales revenue, net \| Inox Wind Limited
Segment Reporting Information [Line Items]
Risk percentage	59.00%	62.00%	56.00%
Geographic concentration risk \| Sales revenue, net \| Outside The United States
Segment Reporting Information [Line Items]
Risk percentage	78.00%	85.00%	86.00%
Minimum
Segment Reporting Information [Line Items]
Megawatts of drive trains and power ratings \| MW	2
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ 2,892	$ 3,248	$ 5,936

Business Segments - Operating Results for Two Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 16,195	$ 27,148	$ 18,507	$ 13,345	$ 27,524	$ 25,772	$ 19,004	$ 23,723	$ 75,195	$ 96,023	$ 70,530
Operating loss	$ (6,988)	$ (4,060)	$ (7,150)	$ (9,344)	$ (1,708)	$ (3,312)	$ (6,841)	$ (8,257)	(27,542)	(20,118)	(52,517)
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Operating loss									(2,892)	(4,027)	(11,306)
Wind
Segment Reporting Information [Line Items]
Revenues									47,269	68,883	51,307
Wind \| Operating Segments
Segment Reporting Information [Line Items]
Operating loss									(4,174)	(1,256)	(14,321)
Grid
Segment Reporting Information [Line Items]
Revenues									27,926	27,140	19,223
Grid \| Operating Segments
Segment Reporting Information [Line Items]
Operating loss									$ (20,476)	$ (14,835)	$ (26,890)

Business Segments - Total Business Segments Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 100,244	$ 135,318
Operating Segments \| Wind
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	18,346	34,389
Operating Segments \| Grid
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	31,060	36,255
Corporate assets
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 50,838	$ 64,674

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, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 16,195	$ 27,148	$ 18,507	$ 13,345	$ 27,524	$ 25,772	$ 19,004	$ 23,723	$ 75,195	$ 96,023	$ 70,530
India
Segment Reporting Information [Line Items]
Revenues									44,243	59,640	39,314
U.S.
Segment Reporting Information [Line Items]
Revenues									16,224	14,565	9,820
China
Segment Reporting Information [Line Items]
Revenues									2,004	8,455	10,410
Asia Pacific
Segment Reporting Information [Line Items]
Revenues									2,106	5,364	3,788
Africa
Segment Reporting Information [Line Items]
Revenues									1,548	2,697	616
Australia
Segment Reporting Information [Line Items]
Revenues									4,053	2,410	1,653
Europe
Segment Reporting Information [Line Items]
Revenues									3,624	1,775	2,239
Canada
Segment Reporting Information [Line Items]
Revenues									$ 1,393	$ 1,117	$ 2,690

Business Segments - Geographic Information about Property, Plant and Equipment Associated with Particular Regions (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 43,438	$ 49,778
North America
Segment Reporting Information [Line Items]
Property, plant and equipment, net	42,699	48,685
Europe
Segment Reporting Information [Line Items]
Property, plant and equipment, net	602	868
Asia Pacific
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 137	$ 225

Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Quarterly Financial Data [Abstract]
Total revenue	$ 16,195	$ 27,148	$ 18,507	$ 13,345	$ 27,524	$ 25,772	$ 19,004	$ 23,723	$ 75,195	$ 96,023	$ 70,530
Operating loss	(6,988)	(4,060)	(7,150)	(9,344)	(1,708)	(3,312)	(6,841)	(8,257)	(27,542)	(20,118)	(52,517)
Net loss	$ (6,925)	$ (2,768)	$ (7,325)	$ (10,355)	$ (3,363)	$ (2,957)	$ (7,698)	$ (9,121)	$ (27,373)	$ (23,139)	$ (48,656)
Net loss per share ― basic (in dollars per share)	$ (0.50)	$ (0.20)	$ (0.53)	$ (0.76)	$ (0.25)	$ (0.22)	$ (0.57)	$ (0.75)	$ (1.98)	$ (1.76)	$ (5.74)
Net loss per share ― diluted (in dollars per share)	$ (0.50)	$ (0.20)	$ (0.53)	$ (0.76)	$ (0.25)	$ (0.22)	$ (0.57)	$ (0.75)	$ (1.98)	$ (1.76)	$ (5.74)

Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	May 10, 2017	Apr. 04, 2017	Mar. 31, 2017	Mar. 31, 2016
Subsequent Event [Line Items]
Common stock, shares authorized (in shares)			75,000,000	75,000,000
Minimum
Subsequent Event [Line Items]
Expected severance cost			$ 1.5
Maximum
Subsequent Event [Line Items]
Expected severance cost			$ 2.0
Subsequent event
Subsequent Event [Line Items]
Number of positions eliminated, period percent		8.00%
Common Stock
Subsequent Event [Line Items]
Issuance of stock (in shares)			380,000	4,000,000
Common Stock \| Subsequent event
Subsequent Event [Line Items]
Issuance of stock (in shares)	4,000,000.0
Sale of stock, price per share (in dollars per share)	$ 4.00
Proceeds from additional equity offering	$ 14.7
Over-allotment options, expiration period	30 days
Over-allotment option \| Common Stock \| Subsequent event
Subsequent Event [Line Items]
Common stock, shares authorized (in shares)	600,000

Schedule II — Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Allowance for doubtful accounts receivable
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, Beginning of Year	$ 54	$ 54	$ 16
Additions	0	0	54
Write-offs	0	0	(16)
Recoveries and Other Adjustments	0	0	0
Balance, End of Year	54	54	54
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, Beginning of Year	301,393	294,860	282,824
Additions	22,580	9,028	15,189
Write-offs	(8,881)	(2,495)	(3,153)
Recoveries and Other Adjustments	0	0	0
Balance, End of Year	$ 315,092	$ 301,393	$ 294,860

Accounts Payable and Accrued Expenses - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2017
Minimum
Product Warranty Liability [Line Items]
Warranty period	1 year
Maximum
Product Warranty Liability [Line Items]
Warranty period	3 years