10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

________________________________

FORM 10-Q

________________________________

x Quarterly Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended: September 30, 2018

¨ Transition Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from _____ to _____.

Commission File Number: 0-19672

________________________________

American Superconductor Corporation

(Exact name of registrant as specified in its charter)

________________________________

Delaware	04-2959321
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
114 East Main St. Ayer, Massachusetts	01432
(Address of principal executive offices)	(Zip Code)

(978) 842-3000

(Registrant’s telephone number, including area code)

N/A

(Former name, former address and former fiscal year, if changed since last report)

________________________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).     Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer ¨	Accelerated filer x
Non-accelerated filer ¨	Smaller reporting company x
	Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No   x

Shares outstanding of the Registrant’s common stock:

Common Stock, par value $0.01 per share	21,364,053
Class	Outstanding as of November 2, 2018

AMERICAN SUPERCONDUCTOR CORPORATION

INDEX

		Page No.
PART I—FINANCIAL INFORMATION
Item 1.	Financial Statements	3
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	25
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	35
Item 4.	Controls and Procedures	35
PART II—OTHER INFORMATION
Item 1.	Legal Proceedings	35
Item 1A.	Risk Factors	35
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	36
Item 3.	Defaults Upon Senior Securities	36
Item 4.	Mine Safety Disclosure	36
Item 5.	Other Information	36
Item 6.	Exhibits	36
Signature		38

2

AMERICAN SUPERCONDUCTOR CORPORATION

PART I — FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands)

	September 30, 2018			March 31, 2018
ASSETS
Current assets:
Cash and cash equivalents	$	56,169		$	34,084
Accounts receivable, net	7,622			7,365
Inventory	16,235			19,780
Note receivable, current portion	3,000			3,000
Prepaid expenses and other current assets	3,339			2,947
Total current assets	86,365			67,176
Property, plant and equipment, net	10,582			12,513
Intangibles, net	3,060			3,230
Note receivable, long term portion, net of discount of $224 as of September 30, 2018 and net of discount of $336 and deferred gain of $105 as of March 31, 2018	2,776			2,559
Goodwill	1,719			1,719
Restricted cash	165			165
Deferred tax assets	506			542
Other assets	332			271
Total assets	$	105,505		$	88,175
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable and accrued expenses	$	15,304		$	12,625
Derivative liabilities	1,399			1,217
Deferred revenue, current portion	10,057			13,483
Total current liabilities	26,760			27,325
Deferred revenue, long term portion	7,891			8,454
Deferred tax liabilities	110			110
Other liabilities	98			57
Total liabilities	34,859			35,946
Commitments and contingencies (Note 15)
Stockholders' equity:
Common stock	216			211
Additional paid-in capital	1,042,962			1,041,113
Treasury stock	(2,042		)	(1,645		)
Accumulated other comprehensive (loss) income	(11		)	883
Accumulated deficit	(970,479		)	(988,333		)
Total stockholders' equity	70,646			52,229
Total liabilities and stockholders' equity	$	105,505		$	88,175

The accompanying notes are an integral part of the unaudited condensed consolidated financial statements.

3

AMERICAN SUPERCONDUCTOR CORPORATION

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share data)

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Revenues	$	14,876		$	11,049		$	27,483		$	19,971
Cost of revenues	11,252			10,777			19,966			24,186
Gross margin	3,624			272			7,517			(4,215		)
Operating expenses:
Research and development	2,264			2,951			5,103			5,667
Selling, general and administrative	5,175			5,339			10,961			11,477
Amortization of acquisition-related intangibles	85			—			170			13
Change in fair value of contingent consideration	—			(201		)	—			(201		)
Restructuring	93			(12		)	403			1,328
(Gain) on Sinovel settlement, net	(28,720		)	—			(28,720		)	—
Total operating (income) expenses	(21,103		)	8,077			(12,083		)	18,284
Operating income (loss)	24,727			(7,805		)	19,600			(22,499		)
Change in fair value of warrants	282			144			(182		)	1,069
Gain on sale of minority interest	—			951			—			951
Interest income, net	232			54			433			45
Other income (expense), net	325			(796		)	934			(2,170		)
Income (loss) before income tax (benefit) expense	25,566			(7,452		)	20,785			(22,604		)
Income tax expense (benefit)	3,008			(171		)	2,964			(71		)
Net income (loss)	$	22,558		$	(7,281	)	$	17,821		$	(22,533	)
Net income (loss) per common share
Basic	$	1.11		$	(0.38	)	$	0.88		$	(1.26	)
Diluted	$	1.10		$	(0.38	)	$	0.87		$	(1.26	)
Weighted average number of common shares outstanding
Basic	20,313			19,060			20,240			17,925
Diluted	20,581			19,060			20,560			17,925

The accompanying notes are an integral part of the unaudited condensed consolidated financial statements.

4

AMERICAN SUPERCONDUCTOR CORPORATION

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(In thousands)

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Net income (loss)	$	22,558		$	(7,281	)	$	17,821		$	(22,533	)
Other comprehensive gain (loss), net of tax:
Foreign currency translation gain (loss)	(678		)	401			(894		)	1,221
Total other comprehensive gain (loss), net of tax	(678		)	401			(894		)	1,221
Comprehensive income (loss)	$	21,880		$	(6,880	)	$	16,927		$	(21,312	)

The accompanying notes are an integral part of the unaudited condensed consolidated financial statements.

5

AMERICAN SUPERCONDUCTOR CORPORATION

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

	Six months ended September 30,
	2018			2017
Cash flows from operating activities:
Net income (loss)	$	17,821		$	(22,533	)
Adjustments to reconcile net income (loss) to net cash used in operations:
Depreciation and amortization	2,307			7,682
Stock-based compensation expense	1,610			1,232
Provision for excess and obsolete inventory	514			351
(Gain) on sale of minority interest	—			(951		)
Change in fair value of warrants	182			(1,270		)
Non-cash interest (income) expense	(112		)	19
Other non-cash items	(727		)	(97		)
Changes in operating asset and liability accounts:
Accounts receivable	(279		)	124
Inventory	1,278			1,354
Prepaid expenses and other current assets	(572		)	85
Accounts payable and accrued expenses	2,166			(770		)
Deferred revenue	(593		)	1,235
Net cash provided by/(used in) operating activities	23,595			(13,539		)
Cash flows from investing activities:
Purchase of property, plant and equipment	(418		)	(483		)
Proceeds from the sale of property, plant and equipment	138			12
Cash paid for acquisition, net of cash acquired	—			134
Proceeds from sale of minority interest	—			951
Change in other assets	(131		)	(130		)
Net cash provided by/(used in) investing activities	(411		)	484
Cash flows from financing activities:
Employee taxes paid related to net settlement of equity awards	(396		)	(274		)
Repayment of debt	—			(1,575		)
Proceeds from public equity offering, net	—			16,952
Proceeds from exercise of employee stock options and ESPP	71			85
Net cash provided by/(used in) financing activities	(325		)	15,188
Effect of exchange rate changes on cash	(774		)	608
Net increase in cash, cash equivalents and restricted cash	22,085			2,741
Cash, cash equivalents and restricted cash at beginning of period	34,249			27,744
Cash, cash equivalents and restricted cash at end of period	$	56,334		$	30,485
Supplemental schedule of cash flow information:
Issuance of common stock in connection with the purchase of Infinia Technology Corporation	$	—		$	3,557
Cash paid for income taxes, net of refunds	1,438			753
Issuance of common stock to settle liabilities	172			185
Cash paid for interest	—			42

The accompanying notes are an integral part of the unaudited condensed consolidated financial statements.

6

AMERICAN SUPERCONDUCTOR CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

1. Nature of the Business and Operations and Liquidity

Nature of the Business and Operations

American Superconductor Corporation (“AMSC” or the “Company”) was founded on April 9, 1987. The Company is a leading provider of megawatt-scale solutions that lower the cost of wind power and enhance the performance of the power grid. In the wind power market, the Company enables manufacturers to field wind turbines through its advanced engineering, support services and power electronics products. In the power grid market, the Company enables electric utilities and renewable energy project developers to connect, transmit and distribute power through its transmission planning services and power electronics and superconductor-based products. The Company’s wind and power grid products and services provide exceptional reliability, security, efficiency and affordability to its customers.

These unaudited condensed consolidated financial statements of the Company have been prepared on a going concern basis in accordance with United States generally accepted accounting principles (“GAAP”) and the Securities and Exchange Commission’s (“SEC”) instructions to Form 10-Q. The going concern basis of presentation assumes that the Company will continue operations and will be able to realize its assets and discharge its liabilities and commitments in the normal course of business. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those instructions. The year-end condensed balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. The unaudited condensed consolidated financial statements, in the opinion of management, reflect all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the results for the interim periods ended September 30, 2018 and 2017 and the financial position at September 30, 2018; however, these results are not necessarily indicative of results which may be expected for the full year. The interim condensed consolidated financial statements, and notes thereto, should be read in conjunction with the audited consolidated financial statements for the year ended March 31, 2018, and notes thereto, included in the Company’s annual report on Form 10-K for the year ended March 31, 2018 filed with the Securities and Exchange Commission on June 6, 2018.

Liquidity

The Company has experienced recurring operating losses and as of September 30, 2018, the Company had an accumulated deficit of $970.5 million. In addition, the Company has experienced recurring negative operating cash flows.  At September 30, 2018, the Company had cash and cash equivalents of $56.2 million, with no outstanding debt other than ordinary trade payables. Cash provided by operations for the six months ended September 30, 2018 was $23.6 million. The current period results include the net gain received from the first installment of the Sinovel settlement of $28.7 million in the three month period ended September 30, 2018.

From April 1, 2011 through the date of this filing, the Company has reduced its global workforce substantially. As of September 30, 2018, the Company had a global workforce of 225 persons.  The Company plans to closely monitor its expenses and, if required, expects to further reduce operating costs and capital spending to enhance liquidity.

Over the last several years, the Company has entered into several debt and equity financing arrangements in order to raise capital.  Since April 1, 2012, the Company has generated aggregate cash flows from financing activities of $84.9 million.  Included in this amount are proceeds of approximately $17.0 million after deducting underwriting discounts and commissions and offering expenses payable by the Company, from the Company's equity offering completed on May 10, 2017, which includes the subsequent exercise by the underwriters of their option in full to purchase additional shares. The Company terminated its At Market Issuance Sales Agreement ("ATM") with FBR Capital Markets & Co. in conjunction with this equity offering. See Note 14 “Stockholders' Equity” for further discussion of these financing arrangements.

On July 3, 2018, the Company and its wholly-owned subsidiaries Suzhou AMSC Superconductor Co. Ltd. (“AMSC China”) and AMSC Austria GMBH (“AMSC Austria”) entered into a settlement agreement (the “Settlement Agreement”) with Sinovel Wind Group Co., Ltd. (“Sinovel”). The Settlement Agreement settles the litigation and arbitration proceedings between the Company and Sinovel, as further described in Note 15 “Commitments and Contingencies". Under the terms of the Settlement Agreement, Sinovel has agreed to pay AMSC China an aggregate cash amount in Renminbi ("RMB") equivalent to $57.5 million, consisting of two installments. Sinovel paid the first installment of $32.5 million on July 4, 2018, which was repatriated to the Company during the six months ended September 30, 2018, and has agreed to pay the second installment of $25.0 million (the “Second Payment”) within ten (10) months after the U.S. District Court for the Western District of Wisconsin (the “District Court”) delivers the first sentence against Sinovel in the criminal case entitled United States v. Sinovel Wind Co., Ltd., Case Number 3:13-

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cr-00084-jdp. On July 6, 2018, the District Court delivered such sentence, and therefore the Second Payment is due by May 6, 2019 (the “Second Payment Due Date”).

On February 1, 2018, ASC Devens LLC (the "Seller"), a wholly-owned subsidiary of the Company, entered into a Purchase and Sale Agreement (the “PSA”) with 64 Jackson, LLC (the “Purchaser”) and Stewart Title Guaranty Company (“Escrow Agent”), to effectuate the sale of certain real property located at 64 Jackson Road, Devens, Massachusetts, including the building that had served as the Company’s headquarters (collectively, the “Property”), in exchange for total consideration of $23.0 million, composed of (i) cash consideration of $17.0 million, and (ii) a $6.0 million subordinated secured commercial promissory note payable to the Company (the "Seller Note"). Subsequently, the Seller, the Purchaser and Jackson 64 MGI, LLC (“Assignee”) entered into an Assignment of Purchase and Sale Agreement (the “Assignment Agreement”), pursuant to which the Purchaser assigned all of its rights and interests in the PSA to the Assignee and the Assignee agreed to assume all of the Purchaser’s obligations and liabilities under the PSA. The transaction closed on March 28, 2018, at which time the Company received, from the Assignee, cash consideration, net of certain agreed upon closing costs, of $16.9 million, and the Seller Note at an interest rate of 1.96%. The Seller Note is secured by a subordinated second mortgage on the Property and a subordinated second assignment of leases and rents.

In December 2015, the Company entered into a set of strategic agreements valued at approximately $210.0 million with Inox Wind Ltd. (“Inox” or "Inox Wind"), which includes a multi-year supply contract pursuant to which the Company will supply electrical control systems to Inox and a license agreement allowing Inox to manufacture a limited number of electrical control systems. After Inox purchases the specified number of electrical control systems required under the terms of the supply contract, 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 electrical control systems requirements for an additional three-year period.

The Company believes that based on the information presented above and its quarterly management assessment, it has sufficient liquidity to fund its operations and capital expenditures for the next twelve months following the issuance of the financial statements for the three and six months ended September 30, 2018. The Company’s liquidity is highly dependent on its ability to increase revenues, including its ability to collect revenues under its agreements with Inox, its ability to control its operating costs, 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, on favorable terms or at all, from other sources or execute on any other means of improving liquidity described above.

2. Revenue Recognition

On April 1, 2018, the Company adopted Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers, and all the related amendments and applied it to all contracts that were not completed as of April 1, 2018 using the modified retrospective method. The Company recognized the cumulative effect of initially applying the new revenue standard as an adjustment of less than $0.1 million to the opening balance of accumulated deficit. Prior period amounts have not been restated and continue to be reported under the accounting standards in effect for those periods.

The adoption of this guidance has led to recognizing certain revenue transactions sooner than in the past on certain contracts, as the Company will need to estimate the revenue it will be entitled to upon contract completion, and later on other contracts, such as Consulting and Statement of Work transactions, due to the lack of an enforceable right to payment for performance obligations satisfied over time, specifically in the technology product line. The Company does not expect a material impact to its consolidated statements of operations on an ongoing basis from the adoption of the new standard.

In addition, the FASB issued Accounting Standards Update ("ASU") 2017-05, Other Income - Gains and Losses from the Derecognition of Non-financial Assets (Subtopic 610-20), in February 2017, to amend ASC 610-20, Other Income - Gains and Losses from the Derecognition of Non-financial Assets (issued at the same time as ASC 606), which provides a model for the measurement and recognition of gains and losses on the sale of non-financial assets, such as property and equipment, including real estate. As a result of adopting ASU 2017-05 on April 1, 2018, the Company recognized an adjustment to the opening balance of accumulated deficit for the deferred gain from the March 28, 2018 sale of the Company's former headquarters in Devens, Massachusetts in the amount of $0.1 million.

The cumulative effect to the Company’s consolidated April 1, 2018 balance sheet from the adoption of the new revenue standard and the sale of nonfinancial assets was as follows (in thousands):

8

	March 31, 2018			Opening Adjustment			April 1, 2018
Assets:
Accounts Receivable	$	7,365		$	(678	)	$	6,687
Inventory	19,780			(1,599		)	18,181
Prepaid expenses and other current assets	2,947			2,277			5,224
Notes receivable, long term portion	2,559			105			2,664
Liabilities and Stockholders' Equity:
Accounts payable and accrued expenses	$	(12,625	)	$	(2,729	)	$	(15,354	)
Deferred revenue	(13,483		)	2,657			(10,826		)
Accumulated deficit	$	(988,333	)	$	(33	)	$	(988,366	)

Included in the opening adjustment are reclassifications for accounts receivable, deferred program costs and deferred revenue for previous balances related to agreements that no longer meet the definition of a customer contract under ASC 606. The impact of adoption on the Company’s opening balances and for the three and six months ended September 30, 2018, in all financial statement line items impacted by ASC 606 was immaterial from the amount that would have been reported under the previous guidance.

The Company’s revenues in its Grid segment are derived primarily through transmitting and distributing power, providing planning services that allow it to identify power grid needs and risks, and developing ship protection systems for the U.S. Navy. The Company’s revenues in its Wind segment are derived primarily through supplying advanced power electronics and control systems, licensing our highly engineered wind turbine designs, and providing extensive customer support services to wind turbine manufacturers. The Company records revenue based on a five-step model in accordance with ASC 606. For its customer contracts, the Company identifies the performance obligations, determines the transaction price, allocates the contract transaction price to the performance obligations, and recognizes the revenue when (or as) control of goods or services is transferred to the customer. As of September 30, 2018, 87% of revenue was recognized at the point in time when control transferred to the customer, with the remainder being recognized over time.

In the Company's equipment and system product line, each contract with a customer summarizes each product sold to a customer, which typically represent distinct performance obligations. A contract's transaction price is allocated to each distinct performance obligation using the respective standalone selling price which is determined primarily using the cost plus expected margin approach and recognized as revenue when, or as, the performance obligation is satisfied. The majority of the Company’s product sales transfer control to the customer in line with the contracted delivery terms and revenue is recorded at the point in time when products are transferred to the freight forwarder, as the Company has determined that this is the point in time that control transfers to the customer.

In the Company's service and technology development product line, there are several different types of transactions but each of them begins with a contract with a customer that summarizes each product sold to a customer, which typically represents distinct performance obligations. The technology development transactions are primarily for activities that have no alternative use and for which a profit can be expected throughout the life of the contract. In these cases, the revenue is recognized over time, but in the instances where the profit cannot be assured throughout the entire contract then the revenue is recognized at a point in time. Each contract's transaction price is allocated to each distinct performance obligation using the respective standalone selling price which is determined primarily using the cost plus expected margin approach. The ongoing service transactions are for service contracts that provide benefit to the customer simultaneously as the Company performs its obligations, and therefore this revenue is recognized ratably over time throughout the effective period of these contracts. The transaction prices on these contracts are allocated based on an adjusted market approach which is re-assessed annually for reasonableness. The field service transactions include contracts for delivery of goods and completion of services made at the customer's requests, which are not deemed satisfied until the work has been completed and/or the requested goods have been delivered, so all of this revenue is recognized at the point in time when the control changes, and at allocated prices based on the adjusted market approach driven by standard price lists. The royalty transactions are related to certain contract terms on transactions in the Company's equipment and systems product line based on activity as specified in the contracts. The transaction prices of these agreements are calculated based on an adjusted market approach as specified in the contract. The Company reports royalty revenue for usage-based royalties when the sales have occurred. In circumstances when collectability is not assured and a contract does not exist under ASC 606, revenue is deferred

9

until a non-refundable payment has been received for substantially all the amount that is due and there are no further remaining performance obligations.

The Company's service contracts can include a purchase order from a customer for specific goods in which each item is a distinct performance obligation satisfied at a point in time at which control of the goods is transferred to the customer which occurs based on the contracted delivery terms or when the requested service work has been completed. The transaction price for these goods is allocated based on the adjusted market approach considering similar transactions under similar circumstances. Service contracts are also derived from ongoing maintenance contracts and extended service-type warranty contracts. In these transactions, the Company is contracted to provide an ongoing service over a specified period of time. As the customer is consuming the benefits as the service is being provided the revenue is recognized over time ratably.

The Company’s policy is to not accept volume discounts, product returns, or rebates and allowances within its contracts. In the event a contract was approved with any of these terms, it would be evaluated for variable consideration, estimated and recorded as a reduction of revenue in the same period the related product revenue was recorded.

The Company provides assurance-type warranties on all product sales for a term of typically one to two years, and extended service-type warranties at the customers’ option for an additional term ranging up to four additional years. The Company accrues for the estimated warranty costs for assurance warranties at the time of sale based on historical warranty experience plus any known or expected changes in warranty exposure. For all extended service-type warranties, the Company recognizes the revenue ratably over time during the effective period of the services.

The Company records revenue net of sales tax, value added tax, excise tax and other taxes collected concurrent with revenue-producing activities. The Company has elected to recognize the cost for freight and shipping when control over the products sold passes to customers and revenue is recognized. The Company has elected to recognize incremental costs of obtaining a contract as expense when incurred except in contracts where the amortization period would exceed twelve months; in such cases the long term amount will be assessed for materiality. The Company has elected to not adjust the promised amount of consideration for the effects of a significant financing component if the period of financing is twelve months or less.

The Company’s contracts with customers do not typically include extended payment terms and may include milestone billing over the life of the contract. Payment terms vary by contract type and type of customer and generally range from 30 to 60 days from delivery.

The following tables disaggregate the Company’s revenue by product line and by shipment destination:

	Three Months Ended September 30, 2018				Six Months Ended September 30, 2018
Product Line:	Grid		Wind		Grid		Wind
Equipment and systems	$	5,503	$	7,219	$	12,957	$	10,711
Services and technology development	2,066		88		3,541		274
Total	$	7,569	$	7,307	$	16,498	$	10,985
Region:
Americas	$	5,052	$	24	$	12,548	$	47
Asia Pacific	2,308		7,278		3,115		10,873
EMEA	209		5		835		65
Total	$	7,569	$	7,307	$	16,498	$	10,985

As of September 30, 2018 and March 31, 2018, the Company’s contract assets and liabilities primarily relate to the timing differences between cash received from a customer in connection with contractual rights to invoicing and the timing of revenue recognition following completion of performance obligations. The Company's accounts receivable balance is made up entirely of customer contract related balances. Changes in the Company’s contract assets, which are included in “Unbilled AR” and "Deferred program costs" (see Note 7, “Accounts Receivable” and Note 8, "Inventory" for a reconciliation to the condensed consolidated balance sheet) and contract liabilities, which are included in the current portion and long term portion of “deferred revenue” in the Company’s condensed consolidated balance sheets, are as follows:

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	Unbilled AR			Deferred Program Costs			Contract Liabilities
Beginning balance as of March 31, 2018	$	3,016		$	2,567		$	21,937
Impact of adoption of ASC 606	—			(1,599		)	(2,657		)
Increases for costs incurred to fulfill performance obligations	—			1,267			—
Increase (decrease) due to customer billings	(7,886		)	—			7,828
Decrease due to cost recognition on completed performance obligations	—			(1,033		)	—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	7,439			(9		)	(8,296		)
Other changes and FX impact	(19		)	24			(864		)
Ending balance as of September 30, 2018	$	2,550		$	1,217		$	17,948

The Company’s remaining performance obligations represent the unrecognized revenue value of the Company’s contractual commitments. The Company’s performance obligations may vary significantly each reporting period based on the timing of major new contractual commitments. As of September 30, 2018, the Company had outstanding performance obligations on existing contracts under ASC 606 to be recognized in the next twelve months of approximately $52.5 million. There are also approximately $7.1 million of outstanding performance obligations to be recognized over a period of thirteen to sixty months. The remaining performance obligations are subject to customer actions and therefore the timing of revenue recognition cannot be reasonably estimated. The twelve month performance obligations include anticipated shipments to Inox based on the twelve month rolling forecast provided by Inox on the multi-year supply contract. The quantities specified in any forecast provided by Inox related to the multi-year supply contract are firm and irrevocable for the first three months of a twelve month rolling forecast. The timing of the performance obligations beyond the Inox twelve month provided forecast are not determinable and therefore are not included in the total remaining performance obligations.

The following table sets forth customers who represented 10% or more of the Company’s total revenues for the three and six months ended September 30, 2018 and 2017:

	Reportable	Three months ended September 30,				Six months ended September 30,
	Segment	2018		2017		2018		2017
Inox Wind Limited	Wind	45	%	46	%	36	%	35	%
Vestas	Grid	11	%	—	%	23	%	—	%
Quanta Power	Grid	12	%	—	%	<10%		—	%
U.S. Navy	Grid	<10%		—	%	<10%		16	%
YMC Inc.	Grid	—	%	15	%	—	%	<10%

3. Stock-Based Compensation

The Company accounts for its stock-based compensation at fair value. The following table summarizes stock-based compensation expense by financial statement line item for the three and six months ended September 30, 2018 and 2017 (in thousands):

	Three months ended September 30,				Six months ended September 30,
	2018		2017		2018		2017
Cost of revenues	$	50	$	23	$	90	$	59
Research and development	70		61		121		110
Selling, general and administrative	705		394		1,399		1,063
Total	$	825	$	478	$	1,610	$	1,232

The Company issued 37,075 shares of immediately vested common stock and 413,000 shares of restricted stock awards during the six months ended September 30, 2018, and issued 37,140 shares of immediately vested common stock and 795,500 shares of restricted stock awards during the six months ended September 30, 2017.  These restricted stock awards generally vest

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over 2-3 years.  Awards for restricted stock include both time-based and performance-based awards.  For options and restricted stock awards that vest upon the passage of time, expense is being recorded over the vesting period.  Performance-based awards are expensed over the requisite service period based on probability of achievement. In addition, the Company issued 16,667 restricted stock units under the 2007 Stock Incentive Plan during the six months ended September 30, 2017, each of which represents the right to receive one share of common stock in connection with a severance agreement entered into with one of the Company's former executive officers. These restricted stock units vested and were settled in shares of common stock on the eighth day after receipt of an irrevocable release.

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 $0.1 million at September 30, 2018. This expense will be recognized over a weighted average expense period of approximately 0.5 years. The total unrecognized compensation cost for unvested outstanding restricted stock was $3.6 million at September 30, 2018. This expense will be recognized over a weighted-average expense period of approximately 1.9 years.

The Company did not grant any stock options during the three and six months ended September 30, 2018 or 2017.

4. Computation of Net Income (Loss) per Common Share

Basic net income (loss) per share (“EPS”) is computed by dividing net income (loss) by the weighted-average number of common shares outstanding for the period. Where applicable, diluted EPS is computed by dividing the net income (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 three months ended September 30, 2018, 1.6 million shares were not included in the calculation of diluted EPS as they were considered anti-dilutive, of which 0.3 million relate to outstanding stock options, 0.9 million relate to outstanding warrants and 0.4 million relate to outstanding awards. For the six months ended September 30, 2018, 1.4 million shares were not included in the calculation of diluted EPS as they were considered anti-dilutive, of which 0.2 million relate to outstanding stock options, 0.9 million relate to outstanding warrants and 0.3 million relate to outstanding awards. For the three and six months ended September 30, 2017, 1.5 million shares were not included in the calculation of diluted EPS as they were considered anti-dilutive, of which 0.3 million relate to outstanding stock options, and 1.2 million relate to outstanding warrants.

The following table reconciles the numerators and denominators of the earnings per share calculation for the three and six months ended September 30, 2018 and 2017 (in thousands, except per share data):

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Numerator:
Net income (loss)	$	22,558		$	(7,281	)	$	17,821		$	(22,533	)
Denominator:
Weighted-average shares of common stock outstanding	21,252			19,531			21,126			18,316
Weighted-average shares subject to repurchase	(939		)	(471		)	(886		)	(391		)
Shares used in per-share calculation ― basic	20,313			19,060			20,240			17,925
Shares used in per-share calculation ― diluted	20,581			19,060			20,560			17,925
Net income (loss) per share ― basic	$	1.11		$	(0.38	)	$	0.88		$	(1.26	)
Net income (loss) per share ― diluted	$	1.10		$	(0.38	)	$	0.87		$	(1.26	)

5. Acquisition and Related Goodwill

Acquisition of Infinia Technology Corporation

On September 25, 2017, the Company acquired Infinia Technology Corporation ("ITC") for approximately $3.8 million (the "Acquisition"). Located in Richmond, Washington, ITC is a technology firm founded in 2009 specializing in the design, development and commercialization of cryo-coolers for a wide range of applications. This technology supports the Company's efforts with the U.S. Navy and Ship Protection Systems (“SPS”) products.

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The results of ITC's operations, which were not significant from the date of acquisition until September 30, 2018, are included in the Company’s consolidated results from the date of Acquisition of September 25, 2017, through September 30, 2018. Assuming the Acquisition had occurred on April 1, 2017, the impact on the consolidated results of the Company would not have been significant.

Goodwill

At the time of the Acquisition, the Company allocated the purchase price to the assets acquired and liabilities assumed at their estimated fair values as of the date of Acquisition. The excess of the purchase price paid by the Company over the estimated fair value of net assets acquired of $1.7 million has been recorded as goodwill in the Company's Grid segment. Goodwill represents the value associated with the acquired workforce and synergies related to the merger of the two companies.

The Company did not identify any triggering events in the six months ended September 30, 2018, that would require interim impairment testing of goodwill.

6. 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, Level 2 or Level 3 of the fair value measurement hierarchy during the six months ended September 30, 2018.

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 September 30, 2018 and March 31, 2018 (in thousands):

	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2018:
Assets:
Cash equivalents	$	46,841	$	46,841	$	—	$	—
Derivative liabilities:
Warrants	1,399		—		—		1,399

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	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2018:
Assets:
Cash equivalents	$	32,589	$	32,589	$	—	$	—
Derivative liabilities:
Warrants	$	1,217	$	—	$	—	$	1,217

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, 2018	$	1,217
Mark to market adjustment	182
Balance at September 30, 2018	$	1,399

	Warrants			Acquisition Contingent Consideration
April 1, 2017	$	1,923		$	—
Issuance of contingent consideration	—			571
Mark to market adjustment	(1,069		)	(201		)
Balance at September 30, 2017	$	854		$	370

Valuation Techniques

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.

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”). These warrants issued to CVI expired on October 4, 2017. See Note 13 “Warrants and Derivative Liabilities,” for additional information. Outstanding 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 13, “Warrants and Derivative Liabilities,” for a discussion of the warrants and the valuation assumptions used.

Contingent Consideration

Contingent consideration relates to a make whole payment provision set forth in the stock purchase agreement ("SPA") for the acquisition of ITC that requires the Company to guarantee the purchase price of the acquisition should the aggregate proceeds of the resale of AMSC shares sold by selling stockholders during the first 90 days after the effectiveness of the resale registration statement be less than the agreed upon purchase price for such AMSC shares (per the terms of the SPA) sold during such 90 day period. See Note 13, "Warrants and Derivative Liabilities" and Note 5, “Acquisition and Related Goodwill” for further discussion. The Company relied on a Black Scholes option pricing method to determine the fair value of the contingent consideration on the date of acquisition. All of the stock related to this liability was sold as of December 5, 2017 and the amount of the make whole payment provided for in the SPA was calculated to be $0.7 million, and subsequently paid on January 5, 2018.

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7. Accounts Receivable

Accounts receivable at September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

	September 30, 2018		March 31, 2018
Accounts receivable (billed)	$	5,072	$	4,403
Accounts receivable (unbilled)	2,550		3,016
Less: Allowance for doubtful accounts	—		(54		)
Accounts receivable, net	$	7,622	$	7,365

8. Inventory

Inventory, net of reserves, at September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

	September 30, 2018		March 31, 2018
Raw materials	$	5,996	$	7,526
Work-in-process	2,306		920
Finished goods	6,716		8,767
Deferred program costs	1,217		2,567
Net inventory	$	16,235	$	19,780

The Company recorded inventory write-downs of $0.4 million and $0.1 million for the three months ended September 30, 2018 and 2017, respectively. The Company recorded inventory write-downs of $0.5 million and $0.4 million for the six months ended September 30, 2018 and 2017, respectively.  These write downs were based on evaluating its inventory on hand for excess quantities and obsolescence.

Deferred program costs as of September 30, 2018 and March 31, 2018 primarily represent costs incurred on programs where the Company needs to complete performance obligations before the related revenue and costs will be recognized.

9. Note Receivable

The Company entered into a purchase and sale agreement dated February 1, 2018, for the sale of the Devens facility (including land, building and building improvements) located at 64 Jackson Road, Devens, Massachusetts to 64 Jackson Road, LLC, a limited liability company, in the amount of $23.0 million. The terms for payment included a $1.0 million security deposit, and a note receivable for $6.0 million payable to the Company with the remaining cash net of certain adjustments for closing costs at the date of settlement. The note receivable is due in two$3.0 million installments plus accrued interest at a rate of 1.96% on March 31, 2019 and March 31, 2020. The note is subordinate to East Boston Savings Bank's mortgage on the Devens property.

The note receivable was discounted to its present value of $5.7 million utilizing a discount rate of 6%, which was based on management’s assessment of what an appropriate loan at current market rates would be. The $0.3 million discount was recorded as an offset to the long term portion of the note receivable, and is being amortized to interest income over the term of the note. In addition, the resulting gain of $0.1 million from the sale of the Devens property which was deferred previously was recorded as a component of the cumulative effect of an accounting change upon the adoption of ASU 2017-05 which was issued as a part of ASU 2014-09. This gain was recorded as an offset to the opening accumulated deficit.

Note receivable as of September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

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Current assets	September 30, 2018			March 31, 2018
Note receivable, current	$	3,000		$	3,000
Total current note receivable	$	3,000		$	3,000
Long term assets
Note receivable, long term	$	3,000		$	3,000
Note receivable discount	(224		)	(336		)
Deferred gain on sale	—			(105		)
Total long term note receivable	$	2,776		$	2,559

10. Property, Plant and Equipment

The cost and accumulated depreciation of property and equipment at September 30, 2018 and March 31, 2018 are as follows (in thousands):

	September 30, 2018			March 31, 2018
Construction in progress - equipment	597			654
Equipment and software	45,797			72,760
Furniture and fixtures	1,307			1,878
Leasehold improvements	1,838			1,426
Property, plant and equipment, gross	49,539			76,718
Less accumulated depreciation	(38,957		)	(64,205		)
Property, plant and equipment, net	$	10,582		$	12,513

Depreciation expense was $1.1 million and $3.2 million for the three months ended September 30, 2018 and 2017, respectively. Depreciation expense was $2.1 million and $7.5 million for the six months ended September 30, 2018 and 2017, respectively. Included in depreciation expense for the three and six months ended September 30, 2017 is $1.6 million and $4.1 million, respectively, of accelerated depreciation recorded to cost of revenues related to revised estimates of the remaining useful lives of certain pieces of manufacturing equipment. Construction in progress - equipment primarily includes capital investments in the Company's newly leased facility in Ayer, Massachusetts.

11. Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses at September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

	September 30, 2018		March 31, 2018
Accounts payable	$	3,934	$	3,096
Accrued inventories in-transit	411		1,207
Accrued other miscellaneous expenses	2,836		2,412
Advanced deposits	890		—
Accrued compensation	3,424		3,605
Income taxes payable	2,049		536
Accrued warranty	1,760		1,769
Total	$	15,304	$	12,625

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

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Product warranty activity was as follows (in thousands):

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Balance at beginning of period	$	1,752		$	2,026		$	1,769		$	2,344
Change in accruals for warranties during the period	213			86			317			127
Settlements during the period	(205		)	(260		)	(326		)	(619		)
Balance at end of period	$	1,760		$	1,852		$	1,760		$	1,852

12. Income Taxes

The Company recorded an income tax expense of $3.0 million in each of the three and six months ended September 30, 2018. The Company recorded income tax benefit of $0.2 million and $0.1 million in the three and six months ended September 30, 2017.  

On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the “Act”) was signed into law. ASC Topic 740 requires deferred tax assets and liabilities to be measured using the enacted rate for the period in which they are expected to reverse. Accordingly, the new 21% U.S. Federal corporate tax rate was used to measure the U.S. deferred tax assets and liabilities that will reverse in future periods. The Company's deferred tax attributes are generally subject to a full valuation allowance in the U.S. and thus, this adjustment to the attributes did not impact the tax provision. In addition, the new legislation includes a one-time transition tax in which all foreign earnings are deemed to be repatriated to the U.S. and taxable at specified rates included within the Act. The Company reviewed the accumulated foreign earnings aggregated across all non U.S. subsidiaries, net of foreign deficits. The Company believes it is in an aggregate net foreign deficit position for U.S. tax purposes and therefore not liable for the transition tax. The SEC staff issued Staff Accounting Bulletin No. 118, which provides guidance for companies that have not completed their accounting for the income tax effects of the Act in the period of enactment, allowing for a measurement period of up to one year after the enactment date to finalize the recording of the related tax impacts. The Company made reasonable estimates and does not anticipate significant revisions to the accounting for the tax impact of the Act, but has not completed the accounting for the tax effects of the Act at September 30, 2018. The Company will continue to assess its provision for income taxes as future guidance is issued, but does not currently anticipate significant revisions will be necessary. The ultimate impact may differ from the Company's provisional estimates, possibly materially, due to additional analysis, changes in interpretations and assumptions the Company has made, additional regulatory guidance that may be used and actions the Company may take as a result of the Act. The accounting is expected to be complete within the one year measurement period in accordance with the measurement period guidance outlined in Staff Accounting Bulletin No. 118.

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 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 to be realized upon ultimate settlement.  The Company re-evaluates these uncertain tax positions on a quarterly basis.  The 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 in the six months ended September 30, 2018 and did not have any gross unrecognized tax benefits as of March 31, 2018.

13. Warrants and Derivative Liabilities

The Company accounts for its warrants and contingent consideration as liabilities due to certain adjustment provisions within the instruments, which require that they be recorded at fair value. The warrants are subject to revaluation at each balance sheet date and any change in fair value is recorded as a change in fair value of warrants until the earlier of its expiration or its exercise at which time the warrant liability will be reclassified to equity. The Company calculated the fair value of the warrants utilizing an integrated lattice model. See Note 6, "Fair Value Measurements", for further discussion.

Hercules Warrants

The Company issued Hercules 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 prior term loans that have been repaid in full. On December 19, 2014, the Company entered into a second amendment to the Loan and Security Agreement with Hercules (the "Hercules Second

17

Amendment"). In conjunction with the Hercules Second Amendment, the Company issued Hercules a warrant to purchase 58,823 shares of the Company’s common stock (the "Hercules Second Amendment")which replaced the First Warrant and the Second Warrant.  The Hercules Warrant is exercisable at any time after its issuance at an exercise price of $7.85 per share, subject to certain price-based and other anti-dilution adjustments, including the equity offering in May 2017, the acquisition of ITC with common stock in September 2017 and sales of common stock under the ATM entered into in January 2017, and expires on June 30, 2020.  This warrant had a fair value of $0.1 million as of September 30, 2018 and March 31, 2018.

November 2014 Warrant

On November 13, 2014, the Company completed an offering of 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 $7.81 per share, subject to certain price-based and other anti-dilution adjustments including those noted above, and expires on November 13, 2019.  

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

Fiscal Year 18	September 30, 2018	June 30, 2018
Risk-free interest rate	2.62%	2.40%
Expected annual dividend yield	—	—
Expected volatility	63.66%	67.40%
Term (years)	1.12	1.37
Fair value	$1.3 million	$1.6 million

Fiscal Year 17	March 31, 2018	December 31, 2017	September 30, 2017	June 30, 2017	March 31, 2017
Risk-free interest rate	2.20%	1.87%	1.49%	1.44%	1.41%
Expected annual dividend yield	—	—	—	—	—
Expected volatility	65.86%	65.86%	65.64%	67.21%	66.53%
Term (years)	1.62	1.87	2.12	2.37	2.62
Fair value	$1.1 million	$0.4 million	$0.8 million	$0.9 million	$1.8 million

The Company recorded a net gain of $0.3 million and a net loss of $0.2 million resulting from the changes in the fair value of the November 2014 Warrant during the three and six months ended September 30, 2018, respectively. The Company recorded net gains of $0.1 million and $1.0 million, resulting from the decrease in the fair value of the November 2014 Warrant during the three and six months ended September 30, 2017, respectively.

14. Stockholders’ Equity

Equity Offerings

On May 5, 2017, the Company entered into an underwriting agreement with Oppenheimer & Co. Inc., as representative of 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 offering expenses payable by the Company. The Offering closed on May 10, 2017. In addition, the Company granted the underwriters a 30-day option (the “Option”) to purchase up to an additional 600,000 shares of common stock at the same public offering price. On May 24, 2017, the underwriters notified the Company that they had exercised their Option in full. The net proceeds to the Company from the Option were approximately $2.3 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company. The total net proceeds to the Company from the Offering and the Option were approximately $17.0 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company. The Option closed on May 26, 2017. In conjunction with the equity offering, the Company terminated a previous At Market Issuance Sales Agreement ("ATM) with FBR Capital Markets & Co. where the Company could, at its discretion, sell up to $10.0 million of the Company's common stock.

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15. Commitments and Contingencies

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 July 3, 2018, the Company, AMSC China and AMSC Austria entered into the Settlement Agreement with Sinovel. The Settlement Agreement settles the litigation and arbitration proceedings between the Company and Sinovel listed on Schedule 2 of the Settlement Agreement (the “Proceedings”), and any other civil claims, counterclaims, causes of action, rights and obligations directly or indirectly relating to the subject matters of the Proceedings and the contracts between the Company and Sinovel listed on Schedules 1 and 4 of the Settlement Agreement (the “Contracts”), subject to the exception described in Section 1.1 of the Settlement Agreement. The Settlement Agreement was filed as Exhibit 10.1 to the Company’s Form 8-K filed with the Securities and Exchange Commission on July 9, 2018.

Under the terms of the Settlement Agreement, Sinovel has agreed to pay AMSC China an aggregate cash amount in RMB equivalent to $57.5 million, consisting of two installments. Sinovel paid the first installment of $32.5 million on July 4, 2018, and has agreed to the Second Payment of $25.0 million within ten (10) months after the District Court delivers the first sentence against Sinovel in the criminal case entitled United States v. Sinovel Wind Co., Ltd., Case Number 3:13-cr-00084-jdp. On July 6, 2018, the District Court delivered such sentence, and therefore the Second Payment is due by May 6, 2019. Mr. Wenyuan Wei, former Sinovel chairman and a current Sinovel shareholder, has delivered a letter of guarantee (the “Guarantee”) to the Company for the Second Payment should Sinovel fail to make such payment by the Second Payment Due Date.

In addition, pursuant to the terms of the Settlement Agreement, the Company and AMSC Austria have granted Sinovel a non-exclusive license for certain AMSC intellectual property to be used solely in Sinovel’s doubly fed wind turbines (the “License”). AMSC has agreed not to sue Sinovel, Sinovel’s power converter suppliers or Sinovel’s customers for use of the technology covered by the License. In the event that Sinovel or Mr. Wei does not make the Second Payment by the Second Payment Due Date, the Settlement Agreement provides that the License will terminate.

The Company and Sinovel have submitted withdrawal applications to terminate the Proceedings to the relevant Chinese courts and the Beijing Arbitration Commission. Subject to the Company and Sinovel complying with the terms of the Settlement Agreement, the Company and Sinovel have agreed not to re-institute any of the Proceedings. In addition, the Company and Sinovel have agreed to a mutual release and covenant not to sue covering all subject matters of the Proceedings and Contracts, effective upon the completion of the Second Payment.

The Company first considered the Settlement under ASC 606 to determine if the arrangement qualified for revenue accounting under ASC 606. As Sinovel is not considered a customer that the Company is supplying goods or services to under ordinary terms, and the Settlement was a negotiation intended to release claims by both parties rather than for the procurement of product or services, the proceeds from the Settlement will not be treated as revenue and will be reported as other income, net of direct expenses, separately in Operating Income (Expense). The Second Payment will be recorded in a similar manner when received.

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 September 30, 2018, the Company had $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.

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16. Restructuring

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

The $0.4 million charged to operations in the six months ended September 30, 2018 is related to exit costs incurred for the move of the Company's corporate office.

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. The purpose of the workforce reduction was to reduce operating expenses to better align with the Company’s current revenues. Included in the $1.3 million severance pay, charged to operations in the six months ended September 30, 2017, is $0.5 million of severance pay for one of the Company's former executive officers pursuant to the terms of a severance agreement dated June 30, 2017. Under the terms of the severance agreement, the Company's former executive officer is entitled to 18 months of his base salary, which is expected to be paid by December 31, 2018. From and after January 1, 2018, the Company, at its discretion, may settle any remaining unpaid cash severance owed to its former executive officer through the issuance of a number of immediately vested shares of the Company’s common stock, determined by multiplying the remaining unpaid cash severance owed by 120%, and then dividing by the closing stock price per share of the Company's common stock as of the last business day prior to the issuance of the shares.

All amounts related to these restructuring activities are expected to be paid by December 31, 2018.

The following table presents restructuring charges and cash payments for the six months ended September 30, 2018 and 2017(in thousands):

	Severance pay			Facility exit and
	and benefits			Relocation costs			Total
Accrued restructuring balance at April 1, 2018	$	262		$	173		$	435
Charges to operations	—			403			403
Cash payments	(173		)	(576		)	(749		)
Accrued restructuring balance at September 30, 2018	$	89		$	—		$	89

	Severance pay			Facility exit and
	and benefits			Relocation costs		Total
Accrued restructuring balance at April 1, 2017	$	—		$	—	$	—
Charges to operations	1,328			—		1,328
Cash payments	(746		)	—		(746		)
Accrued restructuring balance at September 30, 2017	$	582		$	—	$	582

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

17. Business Segments

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

Through the Company’s Windtec Solutions, the Wind business segment enables manufacturers to field wind turbines with exceptional power output, reliability and affordability. The Company supplies advanced power electronics and control systems,

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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 megawatts ("MWs") and higher. The Company provides a broad range of power electronics and software-based control systems that are highly integrated and designed for optimized performance, efficiency, and grid compatibility.

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

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

	Three months ended September 30,				Six months ended September 30,
	2018		2017		2018		2017
Revenues:
Wind	$	7,307	$	5,554	$	10,985	$	7,831
Grid	7,569		5,495		16,498		12,140
Total	$	14,876	$	11,049	$	27,483	$	19,971

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Operating profit/(loss):
Wind	$	28,515		$	(1,440	)	$	27,150		$	(5,873	)
Grid	(2,870		)	(6,100		)	(5,537		)	(14,268		)
Unallocated corporate expenses	(918		)	(265		)	(2,013		)	(2,358		)
Total	$	24,727		$	(7,805	)	$	19,600		$	(22,499	)

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 profit (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 profit (loss).

Unallocated corporate expenses primarily consist of stock-based compensation expense of $0.8 million and $0.5 million, and restructuring charges of $0.1 million and less than $0.1 million, included in the three months ended September 30, 2018 and 2017, respectively. Unallocated corporate expenses primarily consist of stock-based compensation expense of $1.6 million and $1.2 million and restructuring charges of $0.4 million and $1.3 million, included in the six months ended September 30, 2018 and 2017, respectively, as well as a gain for the change in fair value of the contingent consideration of $0.2 million in each of the three and six months ended September 30, 2017.

Total assets for the two business segments as of September 30, 2018 and March 31, 2018 are as follows (in thousands):

	September 30, 2018		March 31, 2018
Wind	$	12,278	$	16,790
Grid	35,077		37,012
Corporate assets	58,150		34,373
Total	$	105,505	$	88,175

18. Recent Accounting Pronouncements

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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 multiple amendments to ASU 2014-09 which are all effective for annual reporting periods beginning after December 15, 2017. 

As of April 1, 2018, the Company has adopted ASU 2014-09 and its amendments, reported the impact in its consolidated financial statements, and implemented changes to its business processes, systems and controls to support revenue recognition and the related disclosures under this ASU. The Company’s assessment included a detailed review of representative contracts from each of the Company’s revenue streams and a comparison of its historical accounting policies and practices to the new standard. The Company adopted the new standards retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective transition method) to all existing contracts that have remaining obligations as of April 1, 2018. Accordingly, the Company has elected to retroactively adjust only those contracts that do not meet the definition of a complete contract at the date of the initial application. This guidance will lead to recognizing certain revenue transactions sooner than in the past on certain contracts, as the Company will need to estimate the revenue it will be entitled to upon contract completion, and later on other contracts, such as Consulting and Statement of Work transactions, due to the lack of an enforceable right to payment for performance obligations satisfied over time. There are no changes in the accounting for its largest revenue stream which includes Inox Wind as its primary customer. Across other revenue streams such as D-VAR® Equipment and D-VAR® Turnkey, the timing of revenue recognition will be affected for multiple types of contracts, primarily multiple performance obligation contracts in its Grid business unit, but those differences did not have a material impact on its consolidated financial statements. The adjustment to opening accumulated deficit was not significant in the period commencing on April 1, 2018. Additionally, the adoption of this new standard is not expected to have any tax impact on the consolidated financial statements. As part of this analysis, the Company evaluated its information technology capabilities and systems, and did not incur significant information technology costs to modify systems currently in place.

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 adopted ASU 2016-01 effective April 1, 2018 and noted no significant impact to its consolidated financial statements.

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 and its amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years.

• In July 2018, the FASB issued ASU 2018-10, Codification improvements to Topic 842, Leases. The amendments in ASU 2018-10 provide more clarification in regards to the application and requirements of ASU 2016-02.

• In July 2018, the FASB issued ASU 2018-11, Topic 842, Leases - Targeted improvements. The amendments in ASU 2018-11 provide for the option to adopt the standard prospectively and recognize a cumulative-effect adjustment to the opening balance of retained earnings as well as offer a new practical expedient that will allow the Company to elect, by class of underlying asset, to not separate non-lease and lease components in certain circumstances and instead to account for those components as a single item.

The Company is currently evaluating the provisions of ASU 2016-02 and its amendments, and assessing the impact the adoption of this guidance will have on its financial position, results of operations and disclosures.  This process has included identifying the implementation team, applying the revised definition of a lease per ASC 842 to existing agreements, and from that information, creating a preliminary population. This population includes agreements identified from the following sources: existing leases under ASC 840, general ledger activity from recurring vendors and information reported from a survey provided to key individuals within the Company. The Company intends to make the policy election to exclude all leases shorter than 12 months from the recognition of the recording of the right of use ("ROU") asset and related liabilities. The Company expects to elect the package of three practical expedients in regards to all leases that commenced before the effective date as well as the practical expedient that allows the use of hindsight in determining lease term. The Company anticipates the adoption of this guidance will result in certain changes to its financial statements to add the related asset and liability accounts for all of its operating leases. The Company will continue to assess its agreements for any other impacts that may result from the adoption of this standard. During the second half of fiscal 2018, the Company plans to finalize its population of leases including the classification of type of lease

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for each of those agreements and assess its current controls, as well as identify and implement any changes that may be necessary to comply with the provisions of ASU 2016-02, which will be effective on April 1, 2019.

The Company is required to adopt the new standards in the first quarter of fiscal 2019 and expects to do so using the modified retrospective transition method, which will impact all leases existing at, or entered into after the period of adoption. For all leases existing at the time of adoption the Company will recognize a cumulative effect adjustment to its opening balance of retained earnings as of April 1, 2019. The Company is still evaluating the final impact of this adoption method on its consolidated financial statements.

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 consolidated financial statements.

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 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 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 adopted ASU 2016-15 and ASU 2016-18 effective April 1, 2018 and noted no significant impact to its consolidated financial statements.

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 adopted ASU 2016-16 effective April 1, 2018 and noted no significant impact to its consolidated financial statements.

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 ASU 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 adopted ASU 2017-05 effective April 1, 2018 and adjusted the opening balance of accumulated deficit for $0.1 million for recognition of the deferred gain on the sale of the 64 Jackson Road building that occurred on March 28, 2018.

In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation (Subtopic 718) Scope of Modification Accounting. The amendments in ASU 2017-09 provide clarity and reduce both (1) diversity in practice and (2) cost and complexity when applying the guidance in Topic 718, Compensation—Stock Compensation, to a change to the terms or conditions of a share-based payment award.  The ASU is effective for annual reporting periods beginning after December 15, 2017, including interim periods within those periods. The Company adopted ASU 2017-09 effective April 1, 2018 and noted no significant impact to its consolidated financial statements.

In July 2017, the FASB issued ASU 2017-11, Earnings per Share (Topic 260), Distinguishing Liabilities from Equity (Topic 480), and Derivatives and Hedging (Topic 815). The amendments in ASU 2017-11 provide guidance for freestanding equity-linked financial instruments, such as warrants and conversion options in convertible debt or preferred stock, and should no longer be accounted for as a derivative liability at fair value as a result of the existence of a down round feature. The ASU is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those periods. The Company

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is currently evaluating the impact the adoption of ASU 2017-11 and does not expect a significant impact on its consolidated financial statements, primarily due to the put option feature which requires continued liability classification under ASC 480.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The amendments in ASU 2017-12 provide improved financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. In addition, the amendments in this update make certain targeted improvements to simplify the application of the hedge accounting guidance. The ASU is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those periods. The Company is currently evaluating the impact the adoption of ASU 2017-12 may have on its consolidated financial statements.

In June 2018, the FASB issued ASU 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Non-Employee Share Based Payment Accounting. The amendments in ASU 2018-07 provide for the simplification of the measurement of share-based payment transactions for acquiring goods and services from non-employees. The ASU is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those periods. The Company is currently evaluating the impact of the adoption of ASU 2018-07 and does not expect it to have a significant impact on its consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in ASU 2018-13 provide for increased effectiveness of the disclosures made around fair value measurements while including consideration for costs and benefits. The ASU is effective for annual reporting periods beginning after December 15, 2019, including interim periods within those periods. The Company is currently evaluating the impact the adoption of ASU 2018-13 may have on its consolidated financial statements.

19. Subsequent Events

The Company has performed an evaluation of subsequent events through the time of filing this Quarterly Report on Form 10-Q with the SEC and has determined that there are no such events to report.

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AMERICAN SUPERCONDUCTOR CORPORATION

MANAGEMENT’S DISCUSSION AND ANALYSIS OF

FINANCIAL CONDITION AND RESULTS OF OPERATIONS

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). For this purpose, any statements contained herein that relate to future events or conditions, including without limitation, the statements in Part II, “Item 1A. Risk Factors” and in Part I under “Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations” and located elsewhere herein regarding industry prospects, our prospective results of operations or financial position, adoption of accounting changes and anticipated payments from Sinovel may be deemed to be forward-looking statements. Without limiting the foregoing, the words “believes,” “anticipates,” “plans,” “expects,” and similar expressions are intended to identify forward-looking statements. Such forward-looking statements represent management’s current expectations and are inherently uncertain.  There are a number of important factors that could materially impact the value of our common stock or cause actual results to differ materially from those indicated by such forward-looking statements. These important factors include, but are not limited to: Sinovel may not make the Second Payment (as defined herein) in the timeframe expected, or at all, and the guarantor may also fail to make the Second Payment; The relevant Chinese courts and the Beijing Arbitration Commission may not accept any re-filing by us of any proceeding with Sinovel; A significant portion of our revenues are derived from a single customer, Inox, and we cannot predict if and how successful Inox will be in executing on Solar Energy Corporation of India ("SECI") orders under the new central and state auction regime, and any related failure by Inox to succeed under this regime, or any delay in Inox’s ability to deliver its wind turbines, could result in fewer ECS shipments to Inox; We have a history of operating losses and negative operating cash flows, which may continue in the future and require us to secure additional financing in the future; Our operating results may fluctuate significantly from quarter to quarter and may fall below expectations in any particular fiscal quarter; Our financial condition may have an adverse effect on our customer and supplier relationships; Lower prices for other fuel sources may reduce the demand for wind energy development, which could have a material adverse effect on our ability to grow our Wind business. Our success in addressing the wind energy market is dependent on the manufacturers that license our designs; Our success is dependent upon attracting and retaining qualified personnel and our inability to do so could significantly damage our business and prospects; We rely upon third-party suppliers for the components and sub-assemblies of many of our Wind and Grid products, making us vulnerable to supply shortages and price fluctuations, which could harm our business; Failure to successfully execute the move of our former Devens, Massachusetts manufacturing facility or achieve expected savings following the move could adversely impact our financial performance; We may not realize all of the sales expected from our backlog of orders and contracts; Our success depends upon the commercial use of high temperature superconductor products, which is currently limited, and a widespread commercial market for our products may not develop; Growth of the wind energy market depends largely on the availability and size of government subsidies, economic incentives and legislative programs designed to support the growth of wind energy; Our contracts with the U.S. government are subject to audit, modification or termination by the U.S. government and include certain other provisions in favor of the government, and additional funding of such contracts may not be approved by the U.S. Congress; Tax reform in the U.S. may negatively affect our operating results; We have operations in and depend on sales in emerging markets, including India, and global conditions could negatively affect our operating results or limit our ability to expand our operations outside of these markets; Our business and operations would be adversely impacted in the event of a failure or security breach of our information technology infrastructure; If we fail to maintain proper and effective internal control over financial reporting, our ability to produce accurate and timely financial statements could be impaired and may lead investors and other users to lose confidence in our financial data; We face risks related to our intellectual property; We face risks related to our legal proceedings; We face risks relating to our settlement with Sinovel; and the important factors discussed under the caption "Risk Factors" in Part 1. Item 1A of our Form 10-K for the fiscal year ended March 31, 2018, Part II. Item 1A of this Quarterly Report on Form 10-Q and our other reports filed with the SEC. These and the important factors discussed under the caption “Risk Factors” in Part 1. Item 1A of our Form 10-K for the fiscal year ended March 31, 2018 and under Part II. Item IA of this Quarterly Report on Form 10-Q among others, could cause actual results to differ materially from those indicated by forward-looking statements made herein and presented elsewhere by management from time to time. Any such forward-looking statements represent management’s estimates as of the date of this Quarterly Report on Form 10-Q. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this Quarterly Report on Form 10-Q.

American Superconductor®, Amperium®, AMSC®, D-VAR®, PowerModule™, D-VAR® VVO, PQ-IVR®, SeaTitan™, Gridtec Solutions™, Windtec Solutions™ and Smarter, Cleaner...Better Energy™ are trademarks or registered trademarks of American Superconductor Corporation or our subsidiaries. We reserve all of our rights with respect to our trademarks or registered

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trademarks regardless of whether they are so designated in this Quarterly Report on Form 10-Q by an ® or ™ symbol. All other brand names, product names, trademarks or service marks appearing in this Quarterly Report on Form 10-Q are the property of their respective holders.

Executive Overview

We are 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, we enable manufacturers to field highly competitive wind turbines through our advanced power electronics products, engineering, and support services. In the power grid market, we enable electric utilities and renewable energy project developers to connect, transmit and distribute power through our transmission planning services and power electronics and superconductor-based products. Our wind and power grid products and services provide exceptional reliability, security, efficiency and affordability to our customers.

Our wind and power grid solutions help to improve energy efficiency, alleviate power grid capacity constraints and increase the adoption of renewable energy generation. Demand for our solutions is driven by the growing needs for renewable sources of electricity, such as wind and solar energy, and for modernized smart grids that improve power reliability, security and quality. Concerns about these factors have led to increased spending by corporations as well as supportive government regulations and initiatives on local, state, national and global levels, including renewable portfolio standards, tax incentives and international treaties.  

We manufacture products using two proprietary core technologies: PowerModule™ programmable power electronic converters and our Amperium® high temperature superconductor (“HTS”) wires. These technologies and our system-level solutions are protected by a broad and deep intellectual property portfolio consisting of hundreds of patents and licenses worldwide.

We operate our business under two market-facing business units: Wind and Grid. We believe this market-centric structure enables us to more effectively anticipate and meet the needs of wind turbine manufacturers, power generation project developers and electric utilities.

• Wind. Through our Windtec Solutions™, our Wind business segment enables manufacturers to field wind turbines with exceptional power output, reliability and affordability. We supply advanced power electronics and control systems, license our highly engineered wind turbine designs, and provide extensive customer support services to wind turbine manufacturers. Our design portfolio includes a broad range of drive trains and power ratings of 2 megawatts (“MW”) and higher. We provide a broad range of power electronics and software-based control systems that are highly integrated and designed for optimized performance, efficiency, and grid compatibility.

• Grid. Through our Gridtec Solutions™, our Grid business segment enables electric utilities and renewable energy project developers to connect, transmit and distribute power with exceptional efficiency, reliability, security and affordability. We provide transmission planning services that allow us to identify power grid congestion, poor power quality, and other risks, which help us determine how our solutions can improve network performance. These services often lead to sales of our grid interconnection solutions for wind farms and solar power plants, power quality systems and transmission and distribution cable systems.  We also sell ship protection products to the U.S. Navy through our Grid business segment.

Our fiscal year begins on April 1 and ends on March 31. When we refer to a particular fiscal year, we are referring to the fiscal year beginning on April 1 of that same year. For example, fiscal 2018 refers to the fiscal year beginning on April 1, 2018. Other fiscal years follow similarly.

On July 3, 2018, we and our wholly-owned subsidiaries Suzhou AMSC Superconductor Co. Ltd. (“AMSC China”) and AMSC Austria GMBH (“AMSC Austria”) entered into a settlement agreement (the “Settlement Agreement”) with Sinovel Wind Group Co., Ltd. (“Sinovel”). The Settlement Agreement settles the litigation and arbitration proceedings between us and Sinovel listed on Schedule 2 of the Settlement Agreement (the “Proceedings”), and any other civil claims, counterclaims, causes of action, rights and obligations directly or indirectly relating to the subject matters of the Proceedings and the contracts between us and Sinovel listed on Schedules 1 and 4 of the Settlement Agreement (the “Contracts”), subject to the exception described in Section 1.1 of the Settlement Agreement. The Settlement Agreement was filed as Exhibit 10.1 to the Company’s Form 8-K filed with the Securities and Exchange Commission on July 9, 2018. Under the terms of the Settlement Agreement, Sinovel agreed to pay AMSC China an aggregate cash amount in Renminbi ("RMB") equivalent to $57.5 million, consisting of two installments. Sinovel paid the first installment of $32.5 million on July 4, 2018, and has agreed to pay the second installment of $25.0 million (the “Second Payment”) within ten (10) months after the U.S. District Court for the Western District of Wisconsin (the “District Court”) delivers

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the first sentence against Sinovel in the criminal case entitled United States v. Sinovel Wind Co., Ltd., Case Number 3:13-cr-00084-jdp. On July 6, 2018, the District Court delivered such sentence, and therefore the Second Payment is due by May 6, 2019 (the "Second Payment Due Date"). Mr. Wenyuan Wei, former Sinovel chairman and a current Sinovel shareholder, has delivered a letter of guarantee to us for the Second Payment should Sinovel fail to make such payment by the Second Payment Due Date.

In addition, pursuant to the terms of the Settlement Agreement, we and AMSC Austria have granted Sinovel a non-exclusive license for certain of our intellectual property to be used solely in Sinovel’s doubly fed wind turbines (the “License”). We have agreed not to sue Sinovel, Sinovel’s power converter suppliers or Sinovel’s customers for use of the technology covered by the License. In the event that Sinovel or Mr. Wei does not make the Second Payment by the Second Payment Due Date, the Settlement Agreement provides that the License will terminate. See Note 15 “Commitments and Contingencies” for additional information on the terms of the Settlement Agreement.

On July 25, 2018, we received notice from BASF Corporation (“BASF”) that BASF will not be extending the term of the Joint Development Agreement dated March 4, 2016 (“JDA”) by and between BASF and us beyond March 3, 2019. As a result, BASF will not be required to pay $1.0 million in 2019 to us as otherwise would have been required pursuant to the terms of the JDA. To date, BASF has paid $6.0 million to us under the JDA.

Critical Accounting Policies and Estimates

The preparation of the unaudited condensed consolidated financial statements requires that we make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. We base our estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ under different assumptions or conditions. During the six months ended September 30, 2018, we adopted ASU 2014-09, which provides for new requirements in regards to revenue recognition. See Note 2, "Revenue Recognition" for further details. Aside from the adoption of ASU 2014-09, there were no significant changes in the critical accounting policies that were disclosed in our Form 10-K for fiscal 2017, which ended on March 31, 2018.

Results of Operations

Three and six months ended September 30, 2018 compared to the three and six months ended September 30, 2017

Revenues

Total revenues increased 35% and 38% to $14.9 million and $27.5 million for the three and six months ended September 30, 2018, compared to $11.0 million and $20.0 million for the three and six months ended September 30, 2017.  Our revenues are summarized as follows (in thousands):

	Three months ended September 30,				Six months ended September 30,
	2018		2017		2018		2017
Revenues:
Wind	$	7,307	$	5,554	$	10,985	$	7,831
Grid	7,569		5,495		16,498		12,140
Total	$	14,876	$	11,049	$	27,483	$	19,971

Our Wind business unit accounted for 49% and 40% of total revenues for the three and six months ended September 30, 2018, compared to 50% and 39% for the three and six months ended September 30, 2017. Revenues in the Wind business unit increased 32% and 40% to $7.3 million and $11.0 million in the three and six months ended September 30, 2018, from $5.6 million and $7.8 million in the three and six months ended September 30, 2017. Wind business unit revenues increased due to increased ECS shipments to Inox during the 2018 periods. Inox has been active in the new central and state government auction regime in India and has over 900 MW of orders from the first four SECI central government auctions, and 50 MW from the Maharashtra state government auction. However, we cannot predict if and how successful Inox will be in executing on these orders or in obtaining new orders under the new central and state auction regime. Any failure by Inox to succeed under this regime, or any delay in Inox’s ability to deliver its wind turbines, could result in fewer ECS shipments to Inox.

Our Grid business unit accounted for 51% and 60% of total revenues for the three and six months ended September 30, 2018, compared to 50% and 61% for the three and six months ended September 30, 2017. Our Grid business unit revenues

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increased 38% and 36% to $7.6 million and $16.5 million in the three and six months ended September 30, 2018, from $5.5 million and $12.1 million in the three and six months ended September 30, 2017. Grid business unit revenues increased primarily due to higher D-VAR system revenues.   

The following table sets forth customers who represented 10% or more of our total revenues for the three and six months ended September 30, 2018 and 2017:

	Reportable	Three months ended September 30,				Six months ended September 30,
	Segment	2018		2017		2018		2017
Inox Wind Limited	Wind	45	%	46	%	36	%	35	%
Vestas	Grid	11	%	—	%	23	%	—	%
Quanta Power	Grid	12	%	—	%	<10%		—	%
U.S. Navy	Grid	<10%		—	%	<10%		16	%
YMC Inc.	Grid	—	%	15	%	—	%	<10%

Cost of Revenues and Gross Margin

Cost of revenues increased by 4% to $11.3 million for the three months ended September 30, 2018, compared to $10.8 million for the three months ended September 30, 2017. Cost of revenues decreased by 17% to $20.0 million for the six months ended September 30, 2018, compared to $24.2 million for the six months ended September 30, 2017. Gross margin was 24% for the three months ended September 30, 2018, compared to 2% for the three months ended September 30, 2017. Gross margin was 27% for the six months ended September 30, 2018, compared to (21)% for the six months ended September 30, 2017. The increases in gross margin in both the three and six month periods were due to increased revenues, a more favorable product mix, lower depreciation and reduced fixed factory overhead.

Operating Expenses

Research and development

R&D expenses decreased in the three and six months ended September 30, 2018 by 23% and 10% to $2.3 million and $5.1 million from $3.0 million and $5.7 million for the three and six months ended September 30, 2017.  The decreases in R&D expenses were primarily due to decreased compensation expense.

Selling, general, and administrative

SG&A expenses decreased by 3% and 4% to $5.2 million and $11.0 million in the three and six months ended September 30, 2018, from $5.3 million and $11.5 million in the three and six months ended September 30, 2017. The decrease in SG&A expenses was due primarily to reduced overall compensation expense.

Gain on Sinovel settlement

We recorded a gain of $28.7 million, net of legal and other direct costs, in each of the three and six months ended September 30, 2018 as a result of the receipt of the first payment from Sinovel required by the Settlement Agreement in July 2018.

Amortization of acquisition related intangibles

We recorded amortization expense related to our core technology and know-how, trade names and trademark intangible assets of $0.1 million and $0.2 million in the three and six months ended September 30, 2018, and less than $0.1 million in each of the three and six months ended September 30, 2017.

Restructuring

We recorded $0.1 million and $0.4 million for facility exit costs in the three and six months ended September 30, 2018 as a result of the move of the corporate office that was announced as part of our April 4, 2017 approved restructuring plan. We recorded a restructuring charge of $1.3 million for severance costs in the six months ended September 30, 2017 as a result of the reduction in force also announced on April 4, 2017. Included in the $1.3 million severance pay charged to operations in the six months ended September 30, 2017, is $0.5 million of severance pay for one of our former executive officers pursuant to the terms of a severance agreement dated June 30, 2017. Under the terms of the severance agreement, our former executive officer is entitled

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to eighteen months of his base salary, which is expected to be paid by December 31, 2018. From and after January 1, 2018, at our discretion, we may settle any remaining unpaid cash severance owed to our former executive officer through the issuance of a number of immediately vested shares of our common stock, determined by multiplying the remaining unpaid cash severance owed by 120%, and then dividing by the closing stock price per share of our common stock as of the last business day prior to the issuance of the shares.

Operating profit/(loss)

Our operating profit/(loss) is summarized as follows (in thousands):

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Operating profit/(loss):
Wind	$	28,515		$	(1,440	)	$	27,150		$	(5,873	)
Grid	(2,870		)	(6,100		)	(5,537		)	(14,268		)
Unallocated corporate expenses	(918		)	(265		)	(2,013		)	(2,358		)
Total	$	24,727		$	(7,805	)	$	19,600		$	(22,499	)

Our Wind segment generated operating income of $28.5 million and $27.1 million in the three and six months ended September 30, 2018, compared to losses of $1.4 million and $5.9 million in the three and six months ended September 30, 2017. The increase in the Wind business unit operating income was due primarily to the receipt of the first payment from Sinovel required by the Settlement Agreement in July 2018 as well as increased shipments of ECS to Inox.

Our Grid segment generated operating losses of $2.9 million and $5.5 million in the three and six months ended September 30, 2018, compared to losses of $6.1 million and $14.3 million in the three and six months ended September 30, 2017. The decrease in the Grid business unit operating losses was due primarily to increased D-VAR revenues, a more favorable product mix, lower depreciation and lower operating expenses compared to the prior year period.

Unallocated corporate expenses primarily consist of stock-based compensation expense of $0.8 million and $0.5 million, and restructuring charges of $0.1 million and less than $0.1 million, included in the three months ended September 30, 2018 and 2017, respectively. Unallocated corporate expenses primarily consist of stock-based compensation expense of $1.6 million and $1.2 million and restructuring charges of $0.4 million and $1.3 million included in the six months ended September 30, 2018 and 2017, respectively, as well as a gain for the change in fair value of contingent consideration of $0.2 million in each of the three and six months ended September 30, 2017.

Change in fair value of warrants

The change in fair value of warrants resulted in a gain of $0.3 million and loss of $0.2 million in the three and six months ended September 30, 2018, compared to a gain of $0.1 million and $1.1 million in the three and six months ended September 30, 2017. The change in the fair value was primarily driven by changes in stock price, which is a key valuation metric.

Interest income, net

Interest income, net, was $0.2 million and $0.4 million in the three and six months ended September 30, 2018, compared to $0.1 million and less than $0.1 million in the three and six months ended September 30, 2017. The increase in interest income was primarily related to imputed interest earned in relation to the outstanding note receivable for the sale of the 64 Jackson Road building.

Other income (expense), net

Other income (expense), net, was income of $0.3 million and $0.9 million in the three and six months ended September 30, 2018, compared to expense of $0.8 million and $2.2 million in the three and six months ended September 30, 2017.  The increase in other income, net, during the three and six months ended September 30, 2018, was primarily driven by higher foreign currency gains.  

Income Taxes

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Income tax expense was $3.0 million in the three and six months ended September 30, 2018, compared to income tax benefit of $0.2 million and $0.1 million in the three and six months ended September 30, 2017. The increase in income tax expense was primarily due to the repayment of previously reserved intercompany trade balances due to AMSC Austria from AMSC China, and a dividend paid by AMSC Austria to us in the three months ended September 30, 2018 following the Sinovel settlement.

Non-GAAP Measures

Generally, a non-GAAP financial measure is a numerical measure of a company’s performance, financial position or cash flow that either excludes or includes amounts that are not normally excluded or included in the most directly comparable measure calculated and presented in accordance with GAAP. The non-GAAP measures included in this Form 10-Q, however, should be considered in addition to, and not as a substitute for or superior to the comparable measure prepared in accordance with GAAP.

We define non-GAAP net loss as net loss before stock-based compensation, gain on Sinovel settlement, amortization of acquisition-related intangibles, changes in fair value of warrants and contingent consideration, non-cash interest expense, tax effect of adjustments, and the other non-cash or unusual charges, indicated in the table below. We believe non-GAAP net loss assists management and investors in comparing our performance across reporting periods on a consistent basis by excluding these non-cash or non-recurring charges that we do not believe are indicative of our core operating performance. A reconciliation of GAAP to non-GAAP net loss is set forth in the table below (in thousands, except per share data):

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Net income (loss)	$	22,558		$	(7,281	)	$	17,821		$	(22,533	)
Sale of minority investments	—			(951		)	—			(951		)
Stock-based compensation	825			478			1,610			1,232
(Gain) on Sinovel settlement, net	(28,720		)	—			(28,720		)	—
Amortization of acquisition-related intangibles	85			—			170			13
Change in fair value of warrants and contingent consideration	(282		)	(346		)	182			(1,270		)
Non-cash interest expense	—			—			—			19
Tax effect of adjustments	2,829			114			2,829			123
Non-GAAP net loss	$	(2,705	)	$	(7,986	)	$	(6,108	)	$	(23,367	)
Non-GAAP net loss per share - basic	$	(0.13	)	$	(0.42	)	$	(0.30	)	$	(1.30	)
Non-GAAP net loss per share - diluted	$	(0.13	)	$	(0.42	)	$	(0.30	)	$	(1.30	)
Weighted average shares outstanding - basic	20,313			19,060			20,240			17,925
Weighted average shares outstanding - diluted	20,313			19,060			20,240			17,925

We incurred non-GAAP net losses of $2.7 million and $6.1 million or $0.13 and $0.30 per share, for the three and six months ended September 30, 2018, compared to non-GAAP net losses of $8.0 million and $23.4 million or $0.42 and $1.30 per share for the three and six months ended September 30, 2017. The decrease in non-GAAP net loss was driven primarily by an increase in net income driven by higher revenues.

We define non-GAAP operating cash flow as operating cash flow before: the gain on Sinovel settlement (net of legal fees and expenses); tax effect of adjustments; and other unusual cash flows or items. We believe non-GAAP operating cash flow assists management and investors in comparing our operating cash flow across reporting periods on a consistent basis by excluding these non-recurring cash items that it does not believe are indicative of our core operating cash flow. A reconciliation of GAAP to non-GAAP operating cash flow is set forth in the table below (in thousands, except per share data).

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	Three months ending
	September 30, 2018
Operating cash flow	$30,481
Sinovel settlement (net of legal fees and expenses)	(30,336	)
Tax effect of adjustments	1,247
Non-GAAP operating cash flow	$1,392

Liquidity and Capital Resources

We have experienced recurring operating losses and as of September 30, 2018 had an accumulated deficit of $970.5 million. In addition, although we generated positive operating cash flows in the six month period ended September 30, 2018, we have historically experienced recurring negative operating cash flows. Although our sales to Inox increased in the six months ended September 30, 2018 compared to the six months ended September 30, 2017, we cannot predict if and how successful Inox will be in executing on SECI orders or in obtaining additional orders under the new central and state auction regime. Any failure by Inox to succeed under this regime, or any delay in Inox’s ability to deliver its wind turbines, could result in fewer ECS shipments to Inox.

Our cash requirements depend on numerous factors, including whether Inox is successful under the new central and state auction regime as noted above, our ability to collect the Second Payment from Sinovel, the successful completion of our product development activities, our ability to commercialize our Resilient Electric Grid (“REG”) and ship protection system solutions, the rate of customer and market adoption of our products, collecting receivables according to established terms, and the continued availability of U.S. government funding during the product development phase of our superconductor-based products. We continue to closely monitor our expenses and, if required, expect to further reduce our operating and capital spending to enhance liquidity.

As of September 30, 2018, we had cash, cash equivalents, and restricted cash of $56.3 million, compared to $34.2 million as of March 31, 2018, an increase of $22.1 million. As of September 30, 2018, we had approximately $5.9 million of cash, cash equivalents, and restricted cash in foreign bank accounts. Our cash and cash equivalents, and restricted cash are summarized as follows (in thousands):

	September 30, 2018		March 31, 2018
Cash and cash equivalents	$	56,169	$	34,084
Restricted cash	165		165
Total cash, cash equivalents, and restricted cash	$	56,334	$	34,249

For the six months ended September 30, 2018, net cash provided by operating activities was $23.6 million compared to $13.5 million of net cash used for the six months ended September 30, 2017. The increase in net cash provided by operations was due primarily to the receipt of the first payment from the Sinovel settlement.

For the six months ended September 30, 2018, net cash used in investing activities was $0.4 million, compared to net cash provided by investing activities of $0.5 million for the six months ended September 30, 2017. The decrease in net cash provided by investing activities was due primarily to the proceeds from the sale of minority interest in the prior year period which did not occur in the current year period.  

For the six months ended September 30, 2018, net cash used in financing activities was $0.3 million compared to net cash provided by financing activities of $15.2 million in the six months ended September 30, 2017. The decrease in net cash provided by financing activities was primarily due to net proceeds of $17.0 million from the issuance of 4.6 million shares of common stock in May 2017, with no such equity offering in the current year period.  

As of September 30, 2018, we had $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.

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We believe we have sufficient available liquidity to fund our operations and capital expenditures for the next twelve months. In addition, we may seek to raise additional capital, which could be in the form of loans, convertible debt or equity, to fund our operating requirements and capital expenditures. Our liquidity is highly dependent on our ability to increase revenues, including our ability to collect revenues under our agreements with Inox, control our operating costs, and our ability to raise additional capital, if necessary. There can be no assurance that we will be able to raise additional capital, on favorable terms or at all, or execute on any other means of improving our liquidity as described above.

Legal Proceedings

We are involved in legal and administrative proceedings and claims of various types. See Part II, Item 1, “Legal Proceedings,” for additional information. We record a liability in our consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. We review these estimates each accounting period as additional information is known and adjust the loss provision when appropriate. If a matter is both probable to result in liability and the amounts of loss can be reasonably estimated, we estimate and disclose 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 our consolidated financial statements.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements, as defined under SEC rules, such as relationships with unconsolidated entities or financial partnerships, which are often referred to as structured finance or special purpose entities, established for the purpose of facilitating transactions that are not required to be reflected on our balance sheet except as discussed below.

We occasionally enter into construction contracts that include a performance bond. As these contracts progress, we continually assess the probability of a payout from the performance bond. Should we determine that such a payout is probable, we would record a liability.

In addition, we have various contractual arrangements in which minimum quantities of goods or services have been committed to be purchased on an annual basis.

Recent Accounting Pronouncements

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

As of April 1, 2018, we have adopted ASU 2014-09 and its amendments, reported the impact in our consolidated financial statements, and implemented changes to our business processes, systems and controls to support revenue recognition and the related disclosures under this ASU. Our assessment included a detailed review of representative contracts from each of our revenue streams and a comparison of our historical accounting policies and practices to the new standard. We adopted the new standards retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective transition method) to all existing contracts that have remaining obligations as of April 1, 2018. Accordingly, we have elected to retroactively adjust only those contracts that do not meet the definition of a complete contract at the date of the initial application. This guidance will lead to recognizing certain revenue transactions sooner than in the past on certain contracts, as we will need to estimate the revenue we will be entitled to upon contract completion, and later on other contracts, such as Consulting and Statement of Work transactions, due to the lack of an enforceable right to payment for performance obligations satisfied over time. There are no changes in the accounting for our largest revenue stream which includes Inox Wind Ltd as our primary customer. Across other revenue streams such as D-VAR® Equipment and D-VAR® Turnkey, the timing of revenue recognition will be affected for multiple types of contracts, primarily multiple performance obligation contracts in our Grid business unit, but those differences did not have a material impact on our consolidated financial statements. The adjustment to opening retained earnings was not significant for the period commencing on April 1, 2018. Additionally, the adoption of this new standard is not expected to have any tax impact on the consolidated financial statements. As part of this analysis, we evaluated our information technology capabilities and systems, and did not incur significant information technology costs to modify systems currently in place.

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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 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.  We adopted ASU 2016-01 effective April 1, 2018 and noted no significant impact to our consolidated financial statements.

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 and its amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years.

• In July 2018, the FASB issued ASU 2018-10, Codification improvements to Topic 842, Leases. The amendments in ASU 2018-10 provide more clarification in regards to the application and requirements of ASU 2016-02.

• In July 2018, the FASB issued ASU 2018-11, Topic 842, Leases - Targeted improvements. The amendments in ASU 2018-11 provide for the option to adopt the standard prospectively and recognize a cumulative-effect adjustment to the opening balance of retained earnings as well as offer a new practical expedient that will allow us to elect, by class of underlying asset, to not separate non-lease and lease components in certain circumstances and instead to account for those components as a single item.

We are currently evaluating the provisions of ASU 2016-02 and its amendments, and assessing the impact the adoption of this guidance will have on our financial position, results of operations and disclosures.  This process has included identifying the implementation team, applying the revised definition of a lease per Accounting Standards Codification ("ASC") 842 to existing agreements and, from that information, creating a preliminary population. This population includes agreements identified from the following sources: existing leases under ASC 840, general ledger activity from recurring vendors and information reported from a survey provided to key individuals within the company. We intend to make the policy election to exclude all leases shorter than 12 months from the recognition of the recording of the right of use ("ROU") asset and related liabilities. We expect to elect the package of three practical expedients in regards to all leases that commenced before the effective date as well as the practical expedient that allows the use of hindsight in determining lease term. We anticipate the adoption of this guidance will result in certain changes to our financial statements to add the related asset and liability accounts for all of our operating leases. We will continue to assess our agreements for any other impacts that may result from the adoption of this standard. During the second half of fiscal 2018, we plan to finalize our population of leases including the classification of type of lease for each of those agreements and assess our current controls, as well as identify and implement any changes that may be necessary to comply with the provisions of ASU 2016-02, which will be effective on April 1, 2019.

We are required to adopt the new standards in the first quarter of fiscal 2019 and expect to do so using the modified retrospective transition method, which will impact all leases existing at, or entered into after the period of adoption. For all leases existing at the time of adoption we will recognize a cumulative effect adjustment to the opening balance of retained earnings as of April 1, 2019. We are still evaluating the final impact of this adoption method on our consolidated financial statements.

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 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.  We are currently evaluating the impact, if any, the adoption of ASU 2016-13 may have on our consolidated financial statements.

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 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 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.

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We adopted ASU 2016-15 and ASU 2016-18 effective April 1, 2018 and noted no significant impact to our consolidated financial statements.

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 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.  We adopted of ASU 2016-16 effective April 1, 2018 and noted no significant impact to our consolidated financial statements.

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 ASU 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.  We adopted ASU 2017-05 effective April 1, 2018 and adjusted the opening balance of accumulated deficit for $0.1 million for recognition of the deferred gain on the sale of the 64 Jackson Road building that occurred on March 28, 2018.

In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation (Subtopic 718) Scope of Modification Accounting. The amendments in ASU 2017-09 provide clarity and reduce both (1) diversity in practice and (2) cost and complexity when applying the guidance in Topic 718, Compensation—Stock Compensation, to a change to the terms or conditions of a share-based payment award.  The ASU is effective for annual reporting periods beginning after December 15, 2017, including interim periods within those periods. We adopted ASU 2017-09 effective April 1, 2018 and noted no significant impact to our consolidated financial statements.

In July 2017, the FASB issued ASU 2017-11, Earnings per Share (Topic 260), Distinguishing Liabilities from Equity (Topic 480), and Derivatives and Hedging (Topic 815). The amendments in ASU 2017-11 provide guidance for freestanding equity-linked financial instruments, such as warrants and conversion options in convertible debt or preferred stock, and should no longer be accounted for as a derivative liability at fair value as a result of the existence of a down round feature. The ASU is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those periods. We are currently evaluating the impact the adoption of ASU 2017-11 and do not expect a significant impact on our consolidated financial statements, primarily due to the put option feature which requires continued liability classification under ASC 840.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The amendments in ASU 2017-12 provide improved financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. In addition, the amendments in this update make certain targeted improvements to simplify the application of the hedge accounting guidance. The ASU is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those periods. We are currently evaluating the impact the adoption of ASU 2017-12 may have on our consolidated financial statements.

In June 2018, the FASB issued ASU 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Non-Employee Share Based Payment Accounting. The amendments in ASU 2018-07 provide for the simplification of the measurement of share-based payment transactions for acquiring goods and services from non-employees. The ASU is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those periods. We are currently evaluating the impact the adoption of ASU 2018-07 and do not expect it to have a significant impact on our consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in ASU 2018-13 provide for increased effectiveness of the disclosures made around fair value measurements while including consideration for costs and benefits. The ASU is effective for annual reporting periods beginning after December 15, 2019, including interim periods within those periods. We are currently evaluating the impact the adoption of ASU 2018-13 may have on our consolidated financial statements.

We do not believe that, outside of those disclosed here, there are any other recently issued accounting pronouncements that will have a material impact on our consolidated financial statements.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Not Applicable

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures as of September 30, 2018. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the Company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on that evaluation of our disclosure controls and procedures as of September 30, 2018, our Chief Executive Officer and Chief Financial Officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Changes in Internal Control over Financial Reporting

There were no changes to our internal controls over financial reporting during the quarter ended September 30, 2018, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II—OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

On September 13, 2011, we commenced a series of legal actions in China against Sinovel. Our Chinese subsidiary, Suzhou AMSC Superconductor Co. Ltd., filed a claim for arbitration with the Beijing Arbitration Commission in accordance with the terms of our supply contracts with Sinovel. The case is captioned (2011) Jing Zhong An Zi No. 0693.

On October 8, 2011, Sinovel filed with the Beijing Arbitration Commission an application under the caption (2011) Jing Zhong An Zi No. 0693, for a counterclaim against us for breach of the same contracts under which we filed our original arbitration claim.

We also submitted a civil action application to the Beijing No. 1 Intermediate People’s Court under the caption (2011) Yi Zhong Min Chu Zi No. 15524, against Sinovel for software copyright infringement on September 13, 2011. In addition, we submitted a civil action application to the Beijing Higher People’s Court against Sinovel and certain of its employees for trade secret infringement on September 13, 2011 under the caption (2011) Gao Min Chu Zi No. 4193.

In connection with the Settlement Agreement described in Note 16 “Commitment and Contingencies,” on July 5, 2018, we and Sinovel submitted withdrawal applications to terminate the foregoing Proceedings to the relevant Chinese courts and the Beijing Arbitration Commission. Subject to our and Sinovel’s compliance with the terms of the Settlement Agreement, we and Sinovel have agreed not to re-institute any of the Proceedings.

On September 16, 2011, we filed a civil copyright infringement complaint in the Hainan Province No. 1 Intermediate People’s Court against Dalian Guotong Electric Co. Ltd. (“Guotong”), a supplier of power converter products to Sinovel, and Huaneng Hainan Power, Inc., a wind farm operator that has purchased Sinovel wind turbines containing Guotong power converter products. The case is captioned (2011) Hainan Yi Zhong Min Chu Zi No. 62. On August 17, 2016, we received notification from the Hainan Higher People’s Court that it dismissed the case for what it cited was a lack of evidence. Due to the Settlement Agreement with Sinovel, we no longer intend to appeal this decision.

ITEM 1A. RISK FACTORS

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Except as noted below there have been no material changes to the risk factors described in Part I, Item IA of our Annual Report on Form 10-K for the fiscal year ended March 31, 2018, filed with the SEC on June 6, 2018.

We face risks relating to our settlement with Sinovel.

On July 3, 2018, we and our wholly-owned subsidiaries AMSC China and AMSC Austria entered into a Settlement Agreement with Sinovel. The Settlement Agreement settles the litigation and arbitration proceedings between us and Sinovel, as further described elsewhere in this Quarterly Report. Under the terms of the Settlement Agreement, Sinovel has agreed to pay AMSC China an aggregate cash amount in Renminbi (RMB) equivalent to $57.5 million, consisting of two installments. Sinovel paid the first installment equivalent of $32.5 million on July 4, 2018, and has agreed to pay the second installment equivalent of $25.0 million by May 6, 2019, which payment has been guaranteed by Mr. Wenyuan Wei, former Sinovel chairman and a current Sinovel shareholder. Sinovel or Mr. Wei may fail to make this second payment by May 6, 2019, or at all. If we do not receive the second installment payment from either Sinovel or Mr. Wei in a timely manner or at all, our business, financial condition and results of operations could be materially adversely affected. In addition, there is no assurance that the relevant taxing authorities will agree with our assessment of the taxes that will be required in relation to foregoing payments.

In addition, if Sinovel and Mr. Wei fail to adhere to the terms of the Settlement Agreement, we may re-file our claims against Sinovel in the Chinese courts and/or with the Beijing Arbitration Commission. The Chinese courts and/or the Beijing Arbitration Commission may not accept any re-filing by us. If we are unable to re-file one or more proceedings, we may be unable to pursue our former claims against Sinovel and unable to recover damages for such claims, which could have a material adverse effect on our business, financial condition and results of operations.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None

ITEM 4. MINE SAFETY DISCLOSURES

Not Applicable

ITEM 5. OTHER INFORMATION

None

ITEM 6. EXHIBITS

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EXHIBIT INDEX

		Incorporated by Reference
Exhibit Number	Exhibit Description		Form	File No.	Exhibit	Filing Date	Filed/Furnished Herewith
10.1	Fiscal 2018 Executive Incentive Plan.		8-K	000-19672	10.1	7/3/18
10.2	Settlement Agreement, entered into by the Company on July 3, 2018.		8-K	000-19672	10.1	7/9/18
10.3	Letter of Guarantee, dated July 3, 2018.		8-K	000-19672	10.2	7/9/18
10.4	Form of Option Surrender Agreement under 2007 Stock Incentive Plan, as amended.						*
31.1	Chief Executive Officer—Certification pursuant to Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.						*
31.2	Chief Financial Officer—Certification pursuant to Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.						*
32.1	Chief Executive Officer—Certification pursuant to Rule13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.						**
32.2	Chief Financial Officer—Certification pursuant to Rule 13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.						**
101.INS	XBRL Instance Document.***
101.SCH	XBRL Taxonomy Extension Schema Document. ***
101.CAL	XBRL Taxonomy Calculation Linkbase Document. ***
101.DEF	XBRL Definition Linkbase Document. ***
101.LAB	XBRL Taxonomy Label Linkbase Document. ***
101.PRE	XBRL Taxonomy Presentation Linkbase Document. ***

_________________________

* Filed herewith

** Furnished herewith

*** Submitted electronically herewith

Attached as Exhibits 101 to this report are the following formatted in XBRL (Extensible Business Reporting Language): (i) Condensed Consolidated Balance Sheet as of September 30, 2018 and March 31, 2018 (ii) Condensed Statements of Operations and Income for the three and six months ended September 30, 2018 and 2017, (iii) Condensed Consolidated Statements of Comprehensive (Loss) Income for the three and six months ended September 30, 2018 and 2017, (iv) Condensed Consolidated Statements of Cash Flows for the six months ended September 30, 2018 and 2017, and (v) Notes to Condensed Consolidated Financial Statements.

37

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		AMERICAN SUPERCONDUCTOR CORPORATION
Date:	November 6, 2018	By:	/s/ John W. Kosiba, Jr.
			John W. Kosiba, Jr.
			Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial and Accounting Officer)

38

EX-10.4

OPTION SURRENDER AGREEMENT

TO:    AMERICAN SUPERCONDUCTOR CORPORATION (THE “COMPANY”)

RE:    SURRENDER OF OPTIONS

The undersigned holder of stock options (the “Company Options”) to acquire shares of common stock of the Company, par value $0.01, granted pursuant to the 2007 Stock Incentive Plan, as amended (the “Plan”), agrees to surrender to the Company each Company Option set forth on Exhibit A hereto (the “Surrendered Options”) in order to allow the Company to allocate the shares underlying the Surrendered Options to other Company employees. The undersigned acknowledges that the surrender of the Surrendered Options shall be without any expectation of the undersigned to receive, and without imposing any obligation on the Company to pay or grant, any cash, equity awards or other consideration presently or in the future in connection with the surrender of the Surrendered Options.

Therefore, without requiring any further action on the part of the undersigned, and notwithstanding any terms of the grant agreement(s) evidencing the Surrendered Options (the “Grant Agreement”) to the contrary, the undersigned hereby irrevocably elects to surrender the Surrendered Options immediately upon the execution of this agreement by the undersigned.

In connection with the surrender of the Surrendered Options, the undersigned represents and warrants to the Company that (a) he or she is the beneficial and registered owner of the Surrendered Options, which are free and clear of all liens, charges, encumbrances and any other rights of others; (b) he or she has good and sufficient power, authority and right to enter into and deliver this agreement and to transfer the legal and beneficial title and ownership of the Surrendered Options to the Company, free and clear of all liens, charges and encumbrances; (c) he or she has duly executed and delivered this agreement and it constitutes a valid and legally binding obligation on him or her, enforceable against him or her in accordance with its terms; and (d) there is no contract, option or any other right of another binding upon or which at any time in the future may become binding upon him or her to sell, transfer, assign, pledge, charge, mortgage or in any other way dispose of or encumber any of the Surrendered Options other than pursuant to the terms of this agreement.

In the event of a conflict between the terms of this agreement and the Plan or the applicable Grant Agreement, the provisions of this agreement shall control.

The undersigned acknowledges that he or she has read this agreement, understands it and voluntarily accepts its terms. The undersigned further acknowledges that this agreement is executed voluntarily and without any duress or undue influence on the part of or on behalf of the Company.

This agreement shall be governed and construed in accordance with the laws of the State of Delaware, without regard to any applicable conflicts of law principles. This agreement may be executed in

1

counterparts, each of which shall be an original, with the same effect as if the signatures affixed thereto were upon the same instrument.

This agreement shall be binding upon and inure to the benefit of the parties hereto and their respective successors, permitted assigns and legal representatives.

DATED as of the ______ day of ______________, 201_.

By:

[Name of Option Holder]

Accepted by the Company on this day of _________, 201_.

AMERICAN SUPERCONDUCTOR CORPORATION

By: ________________________________________

John R. Samia

Vice President and

General Counsel

2

EXHIBIT A

SURRENDERED OPTIONS

Date of Grant    Number     Exercise Price

3

EX-31.1

Exhibit 31.1

AMERICAN SUPERCONDUCTOR CORPORATION

CERTIFICATIONS

I, Daniel P. McGahn, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of American Superconductor Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 6, 2018	By:	/s/Daniel P. McGahn
			Daniel P. McGahn
			Chief Executive Officer

EX-31.2

Exhibit 31.2

AMERICAN SUPERCONDUCTOR CORPORATION

CERTIFICATIONS

I, John W. Kosiba, Jr., certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of American Superconductor Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 6, 2018	By:	/s/John W. Kosiba, Jr.
			John W. Kosiba, Jr.
			Chief Financial Officer

EX-32.1

Exhibit 32.1

AMERICAN SUPERCONDUCTOR CORPORATION

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of American Superconductor Corporation (the “Company”) for the period ended September 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Daniel P. McGahn, Chief Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	November 6, 2018	By:	/s/Daniel P. McGahn
			Daniel P. McGahn
			Chief Executive Officer

EX-32.2

Exhibit 32.2

AMERICAN SUPERCONDUCTOR CORPORATION

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of American Superconductor Corporation (the “Company”) for the period ended September 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, John W. Kosiba, Jr., Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	November 6, 2018	By:	/s/John W. Kosiba, Jr.
			John W. Kosiba, Jr.
			Chief Financial Officer

XML

Document and Entity Information - shares	6 Months Ended
	Sep. 30, 2018	Nov. 02, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
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 Common Stock, Shares Outstanding		21,364,053
Entity Emerging Growth Company	false
Entity Small Business	true

XML

Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 56,169	$ 34,084
Accounts receivable, net	7,622	7,365
Inventory	16,235	19,780
Note receivable, current portion	3,000	3,000
Prepaid expenses and other current assets	3,339	2,947
Total current assets	86,365	67,176
Property, plant and equipment, net	10,582	12,513
Intangibles, net	3,060	3,230
Note receivable, long term portion, net of discount of $224 as of September 30, 2018 and net of discount of $336 and deferred gain of $105 as of March 31, 2018	2,776	2,559
Goodwill	1,719	1,719
Restricted cash	165	165
Deferred tax assets	506	542
Other assets	332	271
Total assets	105,505	88,175
Current liabilities:
Accounts payable and accrued expenses	15,304	12,625
Derivative liabilities	1,399	1,217
Deferred revenue, current portion	10,057	13,483
Total current liabilities	26,760	27,325
Deferred revenue, long term portion	7,891	8,454
Deferred tax liabilities	110	110
Other liabilities	98	57
Total liabilities	34,859	35,946
Commitments and contingencies (Note 15)
Stockholders' equity:
Common stock	216	211
Additional paid-in capital	1,042,962	1,041,113
Treasury stock	(2,042)	(1,645)
Accumulated other comprehensive (loss) income	(11)	883
Accumulated deficit	(970,479)	(988,333)
Total stockholders' equity	70,646	52,229
Total liabilities and stockholders' equity	$ 105,505	$ 88,175

XML

Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Statement of Financial Position [Abstract]
Note receivable discount	$ 224	$ 336
Deferred gain on sale	$ 0	$ 105

XML

Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenues	$ 14,876	$ 11,049	$ 27,483	$ 19,971
Cost of revenues	11,252	10,777	19,966	24,186
Gross margin	3,624	272	7,517	(4,215)
Operating expenses:
Research and development	2,264	2,951	5,103	5,667
Selling, general and administrative	5,175	5,339	10,961	11,477
Amortization of acquisition-related intangibles	85	0	170	13
Change in fair value of contingent consideration	0	(201)	0	(201)
Restructuring	93	(12)	403	1,328
(Gain) on Sinovel settlement, net	(28,720)	0	(28,720)	0
Total operating (income) expenses	(21,103)	8,077	(12,083)	18,284
Operating income (loss)	24,727	(7,805)	19,600	(22,499)
Change in fair value of warrants	282	144	(182)	1,069
Gain on sale of minority interest	0	951	0	951
Interest income, net	232	54	433	45
Other income (expense), net	325	(796)	934	(2,170)
Income (loss) before income tax (benefit) expense	25,566	(7,452)	20,785	(22,604)
Income tax expense (benefit)	3,008	(171)	2,964	(71)
Net income (loss)	$ 22,558	$ (7,281)	$ 17,821	$ (22,533)
Net income (loss) per common share
Basic (in dollars per share)	$ 1.11	$ (0.38)	$ 0.88	$ (1.26)
Diluted (in dollars per share)	$ 1.10	$ (0.38)	$ 0.87	$ (1.26)
Weighted average number of common shares outstanding
Basic (in shares)	20,313	19,060	20,240	17,925
Diluted (in shares)	20,581	19,060	20,560	17,925

XML

Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 22,558	$ (7,281)	$ 17,821	$ (22,533)
Other comprehensive gain (loss), net of tax:
Foreign currency translation gain (loss)	(678)	401	(894)	1,221
Total other comprehensive gain (loss), net of tax	(678)	401	(894)	1,221
Comprehensive income (loss)	$ 21,880	$ (6,880)	$ 16,927	$ (21,312)

XML

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		78 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ 22,558	$ (7,281)	$ 17,821	$ (22,533)
Adjustments to reconcile net income (loss) to net cash used in operations:
Depreciation and amortization			2,307	7,682
Stock-based compensation expense	825	478	1,610	1,232
Provision for excess and obsolete inventory	400	100	514	351
(Gain) on sale of minority interest	0	(951)	0	(951)
Change in fair value of warrants			182	(1,270)
Non-cash interest (income) expense			(112)	19
Other non-cash items			(727)	(97)
Changes in operating asset and liability accounts:
Accounts receivable			(279)	124
Inventory			1,278	1,354
Prepaid expenses and other current assets			(572)	85
Accounts payable and accrued expenses			2,166	(770)
Deferred revenue			(593)	1,235
Net cash provided by/(used in) operating activities			23,595	(13,539)
Cash flows from investing activities:
Purchase of property, plant and equipment			(418)	(483)
Proceeds from the sale of property, plant and equipment			138	12
Cash paid for acquisition, net of cash acquired			0	134
Proceeds from sale of minority interest			0	951
Change in other assets			(131)	(130)
Net cash provided by/(used in) investing activities			(411)	484
Cash flows from financing activities:
Employee taxes paid related to net settlement of equity awards			(396)	(274)
Repayment of debt			0	(1,575)
Proceeds from public equity offering, net			0	16,952
Proceeds from exercise of employee stock options and ESPP			71	85
Net cash provided by/(used in) financing activities			(325)	15,188	$ 84,900
Effect of exchange rate changes on cash			(774)	608
Net increase in cash, cash equivalents and restricted cash			22,085	2,741
Cash, cash equivalents and restricted cash at beginning of period			34,249	27,744
Cash, cash equivalents and restricted cash at end of period	$ 56,334	$ 30,485	56,334	30,485	$ 56,334
Supplemental schedule of cash flow information:
Issuance of common stock in connection with the purchase of Infinia Technology Corporation			0	3,557
Cash paid for income taxes, net of refunds			1,438	753
Issuance of common stock to settle liabilities			172	185
Cash paid for interest			$ 0	$ 42

XML

Nature of the Business and Operations and Liquidity

6 Months Ended

Sep. 30, 2018

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 (“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.

These unaudited condensed consolidated financial statements of the Company have been prepared on a going concern basis in accordance with United States generally accepted accounting principles (“GAAP”) and the Securities and Exchange Commission’s (“SEC”) instructions to Form 10-Q. The going concern basis of presentation assumes that the Company will continue operations and will be able to realize its assets and discharge its liabilities and commitments in the normal course of business. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those instructions. The year-end condensed balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. The unaudited condensed consolidated financial statements, in the opinion of management, reflect all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the results for the interim periods ended September 30, 2018 and 2017 and the financial position at September 30, 2018; however, these results are not necessarily indicative of results which may be expected for the full year. The interim condensed consolidated financial statements, and notes thereto, should be read in conjunction with the audited consolidated financial statements for the year ended March 31, 2018, and notes thereto, included in the Company’s annual report on Form 10-K for the year ended March 31, 2018 filed with the Securities and Exchange Commission on June 6, 2018.

Liquidity

The Company has experienced recurring operating losses and as of September 30, 2018, the Company had an accumulated deficit of $970.5 million. In addition, the Company has experienced recurring negative operating cash flows.  At September 30, 2018, the Company had cash and cash equivalents of $56.2 million, with no outstanding debt other than ordinary trade payables. Cash provided by operations for the six months ended September 30, 2018 was $23.6 million. The current period results include the net gain received from the first installment of the Sinovel settlement of $28.7 million in the three month period ended September 30, 2018.

From April 1, 2011 through the date of this filing, the Company has reduced its global workforce substantially. As of September 30, 2018, the Company had a global workforce of 225 persons.  The Company plans to closely monitor its expenses and, if required, expects to further reduce operating costs and capital spending to enhance liquidity.

Over the last several years, the Company has entered into several debt and equity financing arrangements in order to raise capital.  Since April 1, 2012, the Company has generated aggregate cash flows from financing activities of $84.9 million.  Included in this amount are proceeds of approximately $17.0 million after deducting underwriting discounts and commissions and offering expenses payable by the Company, from the Company's equity offering completed on May 10, 2017, which includes the subsequent exercise by the underwriters of their option in full to purchase additional shares. The Company terminated its At Market Issuance Sales Agreement ("ATM") with FBR Capital Markets & Co. in conjunction with this equity offering. See Note 14 “Stockholders' Equity” for further discussion of these financing arrangements.

On July 3, 2018, the Company and its wholly-owned subsidiaries Suzhou AMSC Superconductor Co. Ltd. (“AMSC China”) and AMSC Austria GMBH (“AMSC Austria”) entered into a settlement agreement (the “Settlement Agreement”) with Sinovel Wind Group Co., Ltd. (“Sinovel”). The Settlement Agreement settles the litigation and arbitration proceedings between the Company and Sinovel, as further described in Note 15 “Commitments and Contingencies". Under the terms of the Settlement Agreement, Sinovel has agreed to pay AMSC China an aggregate cash amount in Renminbi ("RMB") equivalent to $57.5 million, consisting of two installments. Sinovel paid the first installment of $32.5 million on July 4, 2018, which was repatriated to the Company during the six months ended September 30, 2018, and has agreed to pay the second installment of $25.0 million (the “Second Payment”) within ten (10) months after the U.S. District Court for the Western District of Wisconsin (the “District Court”) delivers the first sentence against Sinovel in the criminal case entitled United States v. Sinovel Wind Co., Ltd., Case Number 3:13-cr-00084-jdp. On July 6, 2018, the District Court delivered such sentence, and therefore the Second Payment is due by May 6, 2019 (the “Second Payment Due Date”).

On February 1, 2018, ASC Devens LLC (the "Seller"), a wholly-owned subsidiary of the Company, entered into a Purchase and Sale Agreement (the “PSA”) with 64 Jackson, LLC (the “Purchaser”) and Stewart Title Guaranty Company (“Escrow Agent”), to effectuate the sale of certain real property located at 64 Jackson Road, Devens, Massachusetts, including the building that had served as the Company’s headquarters (collectively, the “Property”), in exchange for total consideration of $23.0 million, composed of (i) cash consideration of $17.0 million, and (ii) a $6.0 million subordinated secured commercial promissory note payable to the Company (the "Seller Note"). Subsequently, the Seller, the Purchaser and Jackson 64 MGI, LLC (“Assignee”) entered into an Assignment of Purchase and Sale Agreement (the “Assignment Agreement”), pursuant to which the Purchaser assigned all of its rights and interests in the PSA to the Assignee and the Assignee agreed to assume all of the Purchaser’s obligations and liabilities under the PSA. The transaction closed on March 28, 2018, at which time the Company received, from the Assignee, cash consideration, net of certain agreed upon closing costs, of $16.9 million, and the Seller Note at an interest rate of 1.96%. The Seller Note is secured by a subordinated second mortgage on the Property and a subordinated second assignment of leases and rents.

In December 2015, the Company entered into a set of strategic agreements valued at approximately $210.0 million with Inox Wind Ltd. (“Inox” or "Inox Wind"), which includes a multi-year supply contract pursuant to which the Company will supply electrical control systems to Inox and a license agreement allowing Inox to manufacture a limited number of electrical control systems. After Inox purchases the specified number of electrical control systems required under the terms of the supply contract, 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 electrical control systems requirements for an additional three-year period.

The Company believes that based on the information presented above and its quarterly management assessment, it has sufficient liquidity to fund its operations and capital expenditures for the next twelve months following the issuance of the financial statements for the three and six months ended September 30, 2018. The Company’s liquidity is highly dependent on its ability to increase revenues, including its ability to collect revenues under its agreements with Inox, its ability to control its operating costs, 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, on favorable terms or at all, from other sources or execute on any other means of improving liquidity described above.

XML

Revenue Recognition

6 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue Recognition

Revenue Recognition

On April 1, 2018, the Company adopted Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers, and all the related amendments and applied it to all contracts that were not completed as of April 1, 2018 using the modified retrospective method. The Company recognized the cumulative effect of initially applying the new revenue standard as an adjustment of less than $0.1 million to the opening balance of accumulated deficit. Prior period amounts have not been restated and continue to be reported under the accounting standards in effect for those periods.

The adoption of this guidance has led to recognizing certain revenue transactions sooner than in the past on certain contracts, as the Company will need to estimate the revenue it will be entitled to upon contract completion, and later on other contracts, such as Consulting and Statement of Work transactions, due to the lack of an enforceable right to payment for performance obligations satisfied over time, specifically in the technology product line. The Company does not expect a material impact to its consolidated statements of operations on an ongoing basis from the adoption of the new standard.

In addition, the FASB issued Accounting Standards Update ("ASU") 2017-05, Other Income - Gains and Losses from the Derecognition of Non-financial Assets (Subtopic 610-20), in February 2017, to amend ASC 610-20, Other Income - Gains and Losses from the Derecognition of Non-financial Assets (issued at the same time as ASC 606), which provides a model for the measurement and recognition of gains and losses on the sale of non-financial assets, such as property and equipment, including real estate. As a result of adopting ASU 2017-05 on April 1, 2018, the Company recognized an adjustment to the opening balance of accumulated deficit for the deferred gain from the March 28, 2018 sale of the Company's former headquarters in Devens, Massachusetts in the amount of $0.1 million.

The cumulative effect to the Company’s consolidated April 1, 2018 balance sheet from the adoption of the new revenue standard and the sale of nonfinancial assets was as follows (in thousands):

	March 31, 2018			Opening Adjustment			April 1, 2018
Assets:
Accounts Receivable	$	7,365		$	(678	)	$	6,687
Inventory	19,780			(1,599		)	18,181
Prepaid expenses and other current assets	2,947			2,277			5,224
Notes receivable, long term portion	2,559			105			2,664
Liabilities and Stockholders' Equity:
Accounts payable and accrued expenses	$	(12,625	)	$	(2,729	)	$	(15,354	)
Deferred revenue	(13,483		)	2,657			(10,826		)
Accumulated deficit	$	(988,333	)	$	(33	)	$	(988,366	)

Included in the opening adjustment are reclassifications for accounts receivable, deferred program costs and deferred revenue for previous balances related to agreements that no longer meet the definition of a customer contract under ASC 606. The impact of adoption on the Company’s opening balances and for the three and six months ended September 30, 2018, in all financial statement line items impacted by ASC 606 was immaterial from the amount that would have been reported under the previous guidance.

The Company’s revenues in its Grid segment are derived primarily through transmitting and distributing power, providing planning services that allow it to identify power grid needs and risks, and developing ship protection systems for the U.S. Navy. The Company’s revenues in its Wind segment are derived primarily through supplying advanced power electronics and control systems, licensing our highly engineered wind turbine designs, and providing extensive customer support services to wind turbine manufacturers. The Company records revenue based on a five-step model in accordance with ASC 606. For its customer contracts, the Company identifies the performance obligations, determines the transaction price, allocates the contract transaction price to the performance obligations, and recognizes the revenue when (or as) control of goods or services is transferred to the customer. As of September 30, 2018, 87% of revenue was recognized at the point in time when control transferred to the customer, with the remainder being recognized over time.

In the Company's equipment and system product line, each contract with a customer summarizes each product sold to a customer, which typically represent distinct performance obligations. A contract's transaction price is allocated to each distinct performance obligation using the respective standalone selling price which is determined primarily using the cost plus expected margin approach and recognized as revenue when, or as, the performance obligation is satisfied. The majority of the Company’s product sales transfer control to the customer in line with the contracted delivery terms and revenue is recorded at the point in time when products are transferred to the freight forwarder, as the Company has determined that this is the point in time that control transfers to the customer.

In the Company's service and technology development product line, there are several different types of transactions but each of them begins with a contract with a customer that summarizes each product sold to a customer, which typically represents distinct performance obligations. The technology development transactions are primarily for activities that have no alternative use and for which a profit can be expected throughout the life of the contract. In these cases, the revenue is recognized over time, but in the instances where the profit cannot be assured throughout the entire contract then the revenue is recognized at a point in time. Each contract's transaction price is allocated to each distinct performance obligation using the respective standalone selling price which is determined primarily using the cost plus expected margin approach. The ongoing service transactions are for service contracts that provide benefit to the customer simultaneously as the Company performs its obligations, and therefore this revenue is recognized ratably over time throughout the effective period of these contracts. The transaction prices on these contracts are allocated based on an adjusted market approach which is re-assessed annually for reasonableness. The field service transactions include contracts for delivery of goods and completion of services made at the customer's requests, which are not deemed satisfied until the work has been completed and/or the requested goods have been delivered, so all of this revenue is recognized at the point in time when the control changes, and at allocated prices based on the adjusted market approach driven by standard price lists. The royalty transactions are related to certain contract terms on transactions in the Company's equipment and systems product line based on activity as specified in the contracts. The transaction prices of these agreements are calculated based on an adjusted market approach as specified in the contract. The Company reports royalty revenue for usage-based royalties when the sales have occurred. In circumstances when collectability is not assured and a contract does not exist under ASC 606, revenue is deferred until a non-refundable payment has been received for substantially all the amount that is due and there are no further remaining performance obligations.

The Company's service contracts can include a purchase order from a customer for specific goods in which each item is a distinct performance obligation satisfied at a point in time at which control of the goods is transferred to the customer which occurs based on the contracted delivery terms or when the requested service work has been completed. The transaction price for these goods is allocated based on the adjusted market approach considering similar transactions under similar circumstances. Service contracts are also derived from ongoing maintenance contracts and extended service-type warranty contracts. In these transactions, the Company is contracted to provide an ongoing service over a specified period of time. As the customer is consuming the benefits as the service is being provided the revenue is recognized over time ratably.

The Company’s policy is to not accept volume discounts, product returns, or rebates and allowances within its contracts. In the event a contract was approved with any of these terms, it would be evaluated for variable consideration, estimated and recorded as a reduction of revenue in the same period the related product revenue was recorded.

The Company provides assurance-type warranties on all product sales for a term of typically one to two years, and extended service-type warranties at the customers’ option for an additional term ranging up to four additional years. The Company accrues for the estimated warranty costs for assurance warranties at the time of sale based on historical warranty experience plus any known or expected changes in warranty exposure. For all extended service-type warranties, the Company recognizes the revenue ratably over time during the effective period of the services.

The Company records revenue net of sales tax, value added tax, excise tax and other taxes collected concurrent with revenue-producing activities. The Company has elected to recognize the cost for freight and shipping when control over the products sold passes to customers and revenue is recognized. The Company has elected to recognize incremental costs of obtaining a contract as expense when incurred except in contracts where the amortization period would exceed twelve months; in such cases the long term amount will be assessed for materiality. The Company has elected to not adjust the promised amount of consideration for the effects of a significant financing component if the period of financing is twelve months or less.

The Company’s contracts with customers do not typically include extended payment terms and may include milestone billing over the life of the contract. Payment terms vary by contract type and type of customer and generally range from 30 to 60 days from delivery.

The following tables disaggregate the Company’s revenue by product line and by shipment destination:

	Three Months Ended September 30, 2018				Six Months Ended September 30, 2018
Product Line:	Grid		Wind		Grid		Wind
Equipment and systems	$	5,503	$	7,219	$	12,957	$	10,711
Services and technology development	2,066		88		3,541		274
Total	$	7,569	$	7,307	$	16,498	$	10,985
Region:
Americas	$	5,052	$	24	$	12,548	$	47
Asia Pacific	2,308		7,278		3,115		10,873
EMEA	209		5		835		65
Total	$	7,569	$	7,307	$	16,498	$	10,985

As of September 30, 2018 and March 31, 2018, the Company’s contract assets and liabilities primarily relate to the timing differences between cash received from a customer in connection with contractual rights to invoicing and the timing of revenue recognition following completion of performance obligations. The Company's accounts receivable balance is made up entirely of customer contract related balances. Changes in the Company’s contract assets, which are included in “Unbilled AR” and "Deferred program costs" (see Note 7, “Accounts Receivable” and Note 8, "Inventory" for a reconciliation to the condensed consolidated balance sheet) and contract liabilities, which are included in the current portion and long term portion of “deferred revenue” in the Company’s condensed consolidated balance sheets, are as follows:

	Unbilled AR			Deferred Program Costs			Contract Liabilities
Beginning balance as of March 31, 2018	$	3,016		$	2,567		$	21,937
Impact of adoption of ASC 606	—			(1,599		)	(2,657		)
Increases for costs incurred to fulfill performance obligations	—			1,267			—
Increase (decrease) due to customer billings	(7,886		)	—			7,828
Decrease due to cost recognition on completed performance obligations	—			(1,033		)	—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	7,439			(9		)	(8,296		)
Other changes and FX impact	(19		)	24			(864		)
Ending balance as of September 30, 2018	$	2,550		$	1,217		$	17,948

The Company’s remaining performance obligations represent the unrecognized revenue value of the Company’s contractual commitments. The Company’s performance obligations may vary significantly each reporting period based on the timing of major new contractual commitments. As of September 30, 2018, the Company had outstanding performance obligations on existing contracts under ASC 606 to be recognized in the next twelve months of approximately $52.5 million. There are also approximately $7.1 million of outstanding performance obligations to be recognized over a period of thirteen to sixty months. The remaining performance obligations are subject to customer actions and therefore the timing of revenue recognition cannot be reasonably estimated. The twelve month performance obligations include anticipated shipments to Inox based on the twelve month rolling forecast provided by Inox on the multi-year supply contract. The quantities specified in any forecast provided by Inox related to the multi-year supply contract are firm and irrevocable for the first three months of a twelve month rolling forecast. The timing of the performance obligations beyond the Inox twelve month provided forecast are not determinable and therefore are not included in the total remaining performance obligations.

The following table sets forth customers who represented 10% or more of the Company’s total revenues for the three and six months ended September 30, 2018 and 2017:

	Reportable	Three months ended September 30,				Six months ended September 30,
	Segment	2018		2017		2018		2017
Inox Wind Limited	Wind	45	%	46	%	36	%	35	%
Vestas	Grid	11	%	—	%	23	%	—	%
Quanta Power	Grid	12	%	—	%	<10%		—	%
U.S. Navy	Grid	<10%		—	%	<10%		16	%
YMC Inc.	Grid	—	%	15	%	—	%	<10%

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Stock-Based Compensation

6 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock-Based Compensation

The Company accounts for its stock-based compensation at fair value. The following table summarizes stock-based compensation expense by financial statement line item for the three and six months ended September 30, 2018 and 2017 (in thousands):

	Three months ended September 30,				Six months ended September 30,
	2018		2017		2018		2017
Cost of revenues	$	50	$	23	$	90	$	59
Research and development	70		61		121		110
Selling, general and administrative	705		394		1,399		1,063
Total	$	825	$	478	$	1,610	$	1,232

The Company issued 37,075 shares of immediately vested common stock and 413,000 shares of restricted stock awards during the six months ended September 30, 2018, and issued 37,140 shares of immediately vested common stock and 795,500 shares of restricted stock awards during the six months ended September 30, 2017.  These restricted stock awards generally vest over 2-3 years.  Awards for restricted stock include both time-based and performance-based awards.  For options and restricted stock awards that vest upon the passage of time, expense is being recorded over the vesting period.  Performance-based awards are expensed over the requisite service period based on probability of achievement. In addition, the Company issued 16,667 restricted stock units under the 2007 Stock Incentive Plan during the six months ended September 30, 2017, each of which represents the right to receive one share of common stock in connection with a severance agreement entered into with one of the Company's former executive officers. These restricted stock units vested and were settled in shares of common stock on the eighth day after receipt of an irrevocable release.

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 $0.1 million at September 30, 2018. This expense will be recognized over a weighted average expense period of approximately 0.5 years. The total unrecognized compensation cost for unvested outstanding restricted stock was $3.6 million at September 30, 2018. This expense will be recognized over a weighted-average expense period of approximately 1.9 years.

The Company did not grant any stock options during the three and six months ended September 30, 2018 or 2017.

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Computation of Net Income (Loss) per Common Share

6 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Computation of Net Income (Loss) per Common Share

Computation of Net Income (Loss) per Common Share

Basic net income (loss) per share (“EPS”) is computed by dividing net income (loss) by the weighted-average number of common shares outstanding for the period. Where applicable, diluted EPS is computed by dividing the net income (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 three months ended September 30, 2018, 1.6 million shares were not included in the calculation of diluted EPS as they were considered anti-dilutive, of which 0.3 million relate to outstanding stock options, 0.9 million relate to outstanding warrants and 0.4 million relate to outstanding awards. For the six months ended September 30, 2018, 1.4 million shares were not included in the calculation of diluted EPS as they were considered anti-dilutive, of which 0.2 million relate to outstanding stock options, 0.9 million relate to outstanding warrants and 0.3 million relate to outstanding awards. For the three and six months ended September 30, 2017, 1.5 million shares were not included in the calculation of diluted EPS as they were considered anti-dilutive, of which 0.3 million relate to outstanding stock options, and 1.2 million relate to outstanding warrants.

The following table reconciles the numerators and denominators of the earnings per share calculation for the three and six months ended September 30, 2018 and 2017 (in thousands, except per share data):

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Numerator:
Net income (loss)	$	22,558		$	(7,281	)	$	17,821		$	(22,533	)
Denominator:
Weighted-average shares of common stock outstanding	21,252			19,531			21,126			18,316
Weighted-average shares subject to repurchase	(939		)	(471		)	(886		)	(391		)
Shares used in per-share calculation ― basic	20,313			19,060			20,240			17,925
Shares used in per-share calculation ― diluted	20,581			19,060			20,560			17,925
Net income (loss) per share ― basic	$	1.11		$	(0.38	)	$	0.88		$	(1.26	)
Net income (loss) per share ― diluted	$	1.10		$	(0.38	)	$	0.87		$	(1.26	)

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Acquisition and Related Goodwill

6 Months Ended

Sep. 30, 2018

Business Combinations [Abstract]

Acquisition and Related Goodwill

Acquisition and Related Goodwill

Acquisition of Infinia Technology Corporation

On September 25, 2017, the Company acquired Infinia Technology Corporation ("ITC") for approximately $3.8 million (the "Acquisition"). Located in Richmond, Washington, ITC is a technology firm founded in 2009 specializing in the design, development and commercialization of cryo-coolers for a wide range of applications. This technology supports the Company's efforts with the U.S. Navy and Ship Protection Systems (“SPS”) products.

The results of ITC's operations, which were not significant from the date of acquisition until September 30, 2018, are included in the Company’s consolidated results from the date of Acquisition of September 25, 2017, through September 30, 2018. Assuming the Acquisition had occurred on April 1, 2017, the impact on the consolidated results of the Company would not have been significant.

Goodwill

At the time of the Acquisition, the Company allocated the purchase price to the assets acquired and liabilities assumed at their estimated fair values as of the date of Acquisition. The excess of the purchase price paid by the Company over the estimated fair value of net assets acquired of $1.7 million has been recorded as goodwill in the Company's Grid segment. Goodwill represents the value associated with the acquired workforce and synergies related to the merger of the two companies.

The Company did not identify any triggering events in the six months ended September 30, 2018, that would require interim impairment testing of goodwill.

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Fair Value Measurements

6 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

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, Level 2 or Level 3 of the fair value measurement hierarchy during the six months ended September 30, 2018.

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 September 30, 2018 and March 31, 2018 (in thousands):

	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2018:
Assets:
Cash equivalents	$	46,841	$	46,841	$	—	$	—
Derivative liabilities:
Warrants	1,399		—		—		1,399

	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2018:
Assets:
Cash equivalents	$	32,589	$	32,589	$	—	$	—
Derivative liabilities:
Warrants	$	1,217	$	—	$	—	$	1,217

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, 2018	$	1,217
Mark to market adjustment	182
Balance at September 30, 2018	$	1,399

	Warrants			Acquisition Contingent Consideration
April 1, 2017	$	1,923		$	—
Issuance of contingent consideration	—			571
Mark to market adjustment	(1,069		)	(201		)
Balance at September 30, 2017	$	854		$	370

Valuation Techniques

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.

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”). These warrants issued to CVI expired on October 4, 2017. See Note 13 “Warrants and Derivative Liabilities,” for additional information. Outstanding 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 13, “Warrants and Derivative Liabilities,” for a discussion of the warrants and the valuation assumptions used.

Contingent Consideration

Contingent consideration relates to a make whole payment provision set forth in the stock purchase agreement ("SPA") for the acquisition of ITC that requires the Company to guarantee the purchase price of the acquisition should the aggregate proceeds of the resale of AMSC shares sold by selling stockholders during the first 90 days after the effectiveness of the resale registration statement be less than the agreed upon purchase price for such AMSC shares (per the terms of the SPA) sold during such 90 day period. See Note 13, "Warrants and Derivative Liabilities" and Note 5, “Acquisition and Related Goodwill” for further discussion. The Company relied on a Black Scholes option pricing method to determine the fair value of the contingent consideration on the date of acquisition. All of the stock related to this liability was sold as of December 5, 2017 and the amount of the make whole payment provided for in the SPA was calculated to be $0.7 million, and subsequently paid on January 5, 2018.

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Accounts Receivable

6 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Accounts Receivable

Accounts Receivable

Accounts receivable at September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

	September 30, 2018		March 31, 2018
Accounts receivable (billed)	$	5,072	$	4,403
Accounts receivable (unbilled)	2,550		3,016
Less: Allowance for doubtful accounts	—		(54		)
Accounts receivable, net	$	7,622	$	7,365

Note Receivable

The Company entered into a purchase and sale agreement dated February 1, 2018, for the sale of the Devens facility (including land, building and building improvements) located at 64 Jackson Road, Devens, Massachusetts to 64 Jackson Road, LLC, a limited liability company, in the amount of $23.0 million. The terms for payment included a $1.0 million security deposit, and a note receivable for $6.0 million payable to the Company with the remaining cash net of certain adjustments for closing costs at the date of settlement. The note receivable is due in two$3.0 million installments plus accrued interest at a rate of 1.96% on March 31, 2019 and March 31, 2020. The note is subordinate to East Boston Savings Bank's mortgage on the Devens property.

The note receivable was discounted to its present value of $5.7 million utilizing a discount rate of 6%, which was based on management’s assessment of what an appropriate loan at current market rates would be. The $0.3 million discount was recorded as an offset to the long term portion of the note receivable, and is being amortized to interest income over the term of the note. In addition, the resulting gain of $0.1 million from the sale of the Devens property which was deferred previously was recorded as a component of the cumulative effect of an accounting change upon the adoption of ASU 2017-05 which was issued as a part of ASU 2014-09. This gain was recorded as an offset to the opening accumulated deficit.

Note receivable as of September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

Current assets	September 30, 2018			March 31, 2018
Note receivable, current	$	3,000		$	3,000
Total current note receivable	$	3,000		$	3,000
Long term assets
Note receivable, long term	$	3,000		$	3,000
Note receivable discount	(224		)	(336		)
Deferred gain on sale	—			(105		)
Total long term note receivable	$	2,776		$	2,559

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Inventory

6 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Inventory

Inventory

Inventory, net of reserves, at September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

	September 30, 2018		March 31, 2018
Raw materials	$	5,996	$	7,526
Work-in-process	2,306		920
Finished goods	6,716		8,767
Deferred program costs	1,217		2,567
Net inventory	$	16,235	$	19,780

The Company recorded inventory write-downs of $0.4 million and $0.1 million for the three months ended September 30, 2018 and 2017, respectively. The Company recorded inventory write-downs of $0.5 million and $0.4 million for the six months ended September 30, 2018 and 2017, respectively.  These write downs were based on evaluating its inventory on hand for excess quantities and obsolescence.

Deferred program costs as of September 30, 2018 and March 31, 2018 primarily represent costs incurred on programs where the Company needs to complete performance obligations before the related revenue and costs will be recognized.

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Note Receivable

6 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Note Receivable

Accounts Receivable

Accounts receivable at September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

	September 30, 2018		March 31, 2018
Accounts receivable (billed)	$	5,072	$	4,403
Accounts receivable (unbilled)	2,550		3,016
Less: Allowance for doubtful accounts	—		(54		)
Accounts receivable, net	$	7,622	$	7,365

Note Receivable

The Company entered into a purchase and sale agreement dated February 1, 2018, for the sale of the Devens facility (including land, building and building improvements) located at 64 Jackson Road, Devens, Massachusetts to 64 Jackson Road, LLC, a limited liability company, in the amount of $23.0 million. The terms for payment included a $1.0 million security deposit, and a note receivable for $6.0 million payable to the Company with the remaining cash net of certain adjustments for closing costs at the date of settlement. The note receivable is due in two$3.0 million installments plus accrued interest at a rate of 1.96% on March 31, 2019 and March 31, 2020. The note is subordinate to East Boston Savings Bank's mortgage on the Devens property.

The note receivable was discounted to its present value of $5.7 million utilizing a discount rate of 6%, which was based on management’s assessment of what an appropriate loan at current market rates would be. The $0.3 million discount was recorded as an offset to the long term portion of the note receivable, and is being amortized to interest income over the term of the note. In addition, the resulting gain of $0.1 million from the sale of the Devens property which was deferred previously was recorded as a component of the cumulative effect of an accounting change upon the adoption of ASU 2017-05 which was issued as a part of ASU 2014-09. This gain was recorded as an offset to the opening accumulated deficit.

Note receivable as of September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

Current assets	September 30, 2018			March 31, 2018
Note receivable, current	$	3,000		$	3,000
Total current note receivable	$	3,000		$	3,000
Long term assets
Note receivable, long term	$	3,000		$	3,000
Note receivable discount	(224		)	(336		)
Deferred gain on sale	—			(105		)
Total long term note receivable	$	2,776		$	2,559

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Property, Plant and Equipment

6 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment

The cost and accumulated depreciation of property and equipment at September 30, 2018 and March 31, 2018 are as follows (in thousands):

	September 30, 2018			March 31, 2018
Construction in progress - equipment	597			654
Equipment and software	45,797			72,760
Furniture and fixtures	1,307			1,878
Leasehold improvements	1,838			1,426
Property, plant and equipment, gross	49,539			76,718
Less accumulated depreciation	(38,957		)	(64,205		)
Property, plant and equipment, net	$	10,582		$	12,513

Depreciation expense was $1.1 million and $3.2 million for the three months ended September 30, 2018 and 2017, respectively. Depreciation expense was $2.1 million and $7.5 million for the six months ended September 30, 2018 and 2017, respectively. Included in depreciation expense for the three and six months ended September 30, 2017 is $1.6 million and $4.1 million, respectively, of accelerated depreciation recorded to cost of revenues related to revised estimates of the remaining useful lives of certain pieces of manufacturing equipment. Construction in progress - equipment primarily includes capital investments in the Company's newly leased facility in Ayer, Massachusetts.

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Accounts Payable and Accrued Expenses

6 Months Ended

Sep. 30, 2018

Payables and Accruals [Abstract]

Accounts Payable and Accrued Expenses

Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses at September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

	September 30, 2018		March 31, 2018
Accounts payable	$	3,934	$	3,096
Accrued inventories in-transit	411		1,207
Accrued other miscellaneous expenses	2,836		2,412
Advanced deposits	890		—
Accrued compensation	3,424		3,605
Income taxes payable	2,049		536
Accrued warranty	1,760		1,769
Total	$	15,304	$	12,625

The Company generally provides a one to two year warranty on its products, commencing upon delivery or installation where applicable. 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):

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Balance at beginning of period	$	1,752		$	2,026		$	1,769		$	2,344
Change in accruals for warranties during the period	213			86			317			127
Settlements during the period	(205		)	(260		)	(326		)	(619		)
Balance at end of period	$	1,760		$	1,852		$	1,760		$	1,852

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Income Taxes

6 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Company recorded an income tax expense of $3.0 million in each of the three and six months ended September 30, 2018. The Company recorded income tax benefit of $0.2 million and $0.1 million in the three and six months ended September 30, 2017.  

On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the “Act”) was signed into law. ASC Topic 740 requires deferred tax assets and liabilities to be measured using the enacted rate for the period in which they are expected to reverse. Accordingly, the new 21% U.S. Federal corporate tax rate was used to measure the U.S. deferred tax assets and liabilities that will reverse in future periods. The Company's deferred tax attributes are generally subject to a full valuation allowance in the U.S. and thus, this adjustment to the attributes did not impact the tax provision. In addition, the new legislation includes a one-time transition tax in which all foreign earnings are deemed to be repatriated to the U.S. and taxable at specified rates included within the Act. The Company reviewed the accumulated foreign earnings aggregated across all non U.S. subsidiaries, net of foreign deficits. The Company believes it is in an aggregate net foreign deficit position for U.S. tax purposes and therefore not liable for the transition tax. The SEC staff issued Staff Accounting Bulletin No. 118, which provides guidance for companies that have not completed their accounting for the income tax effects of the Act in the period of enactment, allowing for a measurement period of up to one year after the enactment date to finalize the recording of the related tax impacts. The Company made reasonable estimates and does not anticipate significant revisions to the accounting for the tax impact of the Act, but has not completed the accounting for the tax effects of the Act at September 30, 2018. The Company will continue to assess its provision for income taxes as future guidance is issued, but does not currently anticipate significant revisions will be necessary. The ultimate impact may differ from the Company's provisional estimates, possibly materially, due to additional analysis, changes in interpretations and assumptions the Company has made, additional regulatory guidance that may be used and actions the Company may take as a result of the Act. The accounting is expected to be complete within the one year measurement period in accordance with the measurement period guidance outlined in Staff Accounting Bulletin No. 118.

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 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 to be realized upon ultimate settlement.  The Company re-evaluates these uncertain tax positions on a quarterly basis.  The 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 in the six months ended September 30, 2018 and did not have any gross unrecognized tax benefits as of March 31, 2018.

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Warrants and Derivative Liabilities

6 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Warrants and Derivative Liabilities

Warrants and Derivative Liabilities

The Company accounts for its warrants and contingent consideration as liabilities due to certain adjustment provisions within the instruments, which require that they be recorded at fair value. The warrants are subject to revaluation at each balance sheet date and any change in fair value is recorded as a change in fair value of warrants until the earlier of its expiration or its exercise at which time the warrant liability will be reclassified to equity. The Company calculated the fair value of the warrants utilizing an integrated lattice model. See Note 6, "Fair Value Measurements", for further discussion.

Hercules Warrants

The Company issued Hercules 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 prior term loans that have been repaid in full. On December 19, 2014, the Company entered into a second amendment to the Loan and Security Agreement with Hercules (the "Hercules Second Amendment"). In conjunction with the Hercules Second Amendment, the Company issued Hercules a warrant to purchase 58,823 shares of the Company’s common stock (the "Hercules Second Amendment")which replaced the First Warrant and the Second Warrant.  The Hercules Warrant is exercisable at any time after its issuance at an exercise price of $7.85 per share, subject to certain price-based and other anti-dilution adjustments, including the equity offering in May 2017, the acquisition of ITC with common stock in September 2017 and sales of common stock under the ATM entered into in January 2017, and expires on June 30, 2020.  This warrant had a fair value of $0.1 million as of September 30, 2018 and March 31, 2018.

November 2014 Warrant

On November 13, 2014, the Company completed an offering of 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 $7.81 per share, subject to certain price-based and other anti-dilution adjustments including those noted above, and expires on November 13, 2019.  

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

Fiscal Year 18	September 30, 2018	June 30, 2018
Risk-free interest rate	2.62%	2.40%
Expected annual dividend yield	—	—
Expected volatility	63.66%	67.40%
Term (years)	1.12	1.37
Fair value	$1.3 million	$1.6 million

Fiscal Year 17	March 31, 2018	December 31, 2017	September 30, 2017	June 30, 2017	March 31, 2017
Risk-free interest rate	2.20%	1.87%	1.49%	1.44%	1.41%
Expected annual dividend yield	—	—	—	—	—
Expected volatility	65.86%	65.86%	65.64%	67.21%	66.53%
Term (years)	1.62	1.87	2.12	2.37	2.62
Fair value	$1.1 million	$0.4 million	$0.8 million	$0.9 million	$1.8 million

The Company recorded a net gain of $0.3 million and a net loss of $0.2 million resulting from the changes in the fair value of the November 2014 Warrant during the three and six months ended September 30, 2018, respectively. The Company recorded net gains of $0.1 million and $1.0 million, resulting from the decrease in the fair value of the November 2014 Warrant during the three and six months ended September 30, 2017, respectively.

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Stockholders' Equity

6 Months Ended

Sep. 30, 2018

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Equity Offerings

On May 5, 2017, the Company entered into an underwriting agreement with Oppenheimer & Co. Inc., as representative of 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 offering expenses payable by the Company. The Offering closed on May 10, 2017. In addition, the Company granted the underwriters a 30-day option (the “Option”) to purchase up to an additional 600,000 shares of common stock at the same public offering price. On May 24, 2017, the underwriters notified the Company that they had exercised their Option in full. The net proceeds to the Company from the Option were approximately $2.3 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company. The total net proceeds to the Company from the Offering and the Option were approximately $17.0 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company. The Option closed on May 26, 2017. In conjunction with the equity offering, the Company terminated a previous At Market Issuance Sales Agreement ("ATM) with FBR Capital Markets & Co. where the Company could, at its discretion, sell up to $10.0 million of the Company's common stock.

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Commitments and Contingencies

6 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

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 July 3, 2018, the Company, AMSC China and AMSC Austria entered into the Settlement Agreement with Sinovel. The Settlement Agreement settles the litigation and arbitration proceedings between the Company and Sinovel listed on Schedule 2 of the Settlement Agreement (the “Proceedings”), and any other civil claims, counterclaims, causes of action, rights and obligations directly or indirectly relating to the subject matters of the Proceedings and the contracts between the Company and Sinovel listed on Schedules 1 and 4 of the Settlement Agreement (the “Contracts”), subject to the exception described in Section 1.1 of the Settlement Agreement. The Settlement Agreement was filed as Exhibit 10.1 to the Company’s Form 8-K filed with the Securities and Exchange Commission on July 9, 2018.

Under the terms of the Settlement Agreement, Sinovel has agreed to pay AMSC China an aggregate cash amount in RMB equivalent to $57.5 million, consisting of two installments. Sinovel paid the first installment of $32.5 million on July 4, 2018, and has agreed to the Second Payment of $25.0 million within ten (10) months after the District Court delivers the first sentence against Sinovel in the criminal case entitled United States v. Sinovel Wind Co., Ltd., Case Number 3:13-cr-00084-jdp. On July 6, 2018, the District Court delivered such sentence, and therefore the Second Payment is due by May 6, 2019. Mr. Wenyuan Wei, former Sinovel chairman and a current Sinovel shareholder, has delivered a letter of guarantee (the “Guarantee”) to the Company for the Second Payment should Sinovel fail to make such payment by the Second Payment Due Date.

In addition, pursuant to the terms of the Settlement Agreement, the Company and AMSC Austria have granted Sinovel a non-exclusive license for certain AMSC intellectual property to be used solely in Sinovel’s doubly fed wind turbines (the “License”). AMSC has agreed not to sue Sinovel, Sinovel’s power converter suppliers or Sinovel’s customers for use of the technology covered by the License. In the event that Sinovel or Mr. Wei does not make the Second Payment by the Second Payment Due Date, the Settlement Agreement provides that the License will terminate.

The Company and Sinovel have submitted withdrawal applications to terminate the Proceedings to the relevant Chinese courts and the Beijing Arbitration Commission. Subject to the Company and Sinovel complying with the terms of the Settlement Agreement, the Company and Sinovel have agreed not to re-institute any of the Proceedings. In addition, the Company and Sinovel have agreed to a mutual release and covenant not to sue covering all subject matters of the Proceedings and Contracts, effective upon the completion of the Second Payment.

The Company first considered the Settlement under ASC 606 to determine if the arrangement qualified for revenue accounting under ASC 606. As Sinovel is not considered a customer that the Company is supplying goods or services to under ordinary terms, and the Settlement was a negotiation intended to release claims by both parties rather than for the procurement of product or services, the proceeds from the Settlement will not be treated as revenue and will be reported as other income, net of direct expenses, separately in Operating Income (Expense). The Second Payment will be recorded in a similar manner when received.

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 September 30, 2018, the Company had $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.

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Restructuring

6 Months Ended

Sep. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring

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.

The $0.4 million charged to operations in the six months ended September 30, 2018 is related to exit costs incurred for the move of the Company's corporate office.

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. The purpose of the workforce reduction was to reduce operating expenses to better align with the Company’s current revenues. Included in the $1.3 million severance pay, charged to operations in the six months ended September 30, 2017, is $0.5 million of severance pay for one of the Company's former executive officers pursuant to the terms of a severance agreement dated June 30, 2017. Under the terms of the severance agreement, the Company's former executive officer is entitled to 18 months of his base salary, which is expected to be paid by December 31, 2018. From and after January 1, 2018, the Company, at its discretion, may settle any remaining unpaid cash severance owed to its former executive officer through the issuance of a number of immediately vested shares of the Company’s common stock, determined by multiplying the remaining unpaid cash severance owed by 120%, and then dividing by the closing stock price per share of the Company's common stock as of the last business day prior to the issuance of the shares.

All amounts related to these restructuring activities are expected to be paid by December 31, 2018.

The following table presents restructuring charges and cash payments for the six months ended September 30, 2018 and 2017(in thousands):

	Severance pay			Facility exit and
	and benefits			Relocation costs			Total
Accrued restructuring balance at April 1, 2018	$	262		$	173		$	435
Charges to operations	—			403			403
Cash payments	(173		)	(576		)	(749		)
Accrued restructuring balance at September 30, 2018	$	89		$	—		$	89

	Severance pay			Facility exit and
	and benefits			Relocation costs		Total
Accrued restructuring balance at April 1, 2017	$	—		$	—	$	—
Charges to operations	1,328			—		1,328
Cash payments	(746		)	—		(746		)
Accrued restructuring balance at September 30, 2017	$	582		$	—	$	582

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

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Business Segments

6 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Business Segments

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 megawatts ("MWs") and higher. The Company provides a broad range of power electronics and software-based control systems that are highly integrated and designed for optimized performance, efficiency, and grid compatibility.

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

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

	Three months ended September 30,				Six months ended September 30,
	2018		2017		2018		2017
Revenues:
Wind	$	7,307	$	5,554	$	10,985	$	7,831
Grid	7,569		5,495		16,498		12,140
Total	$	14,876	$	11,049	$	27,483	$	19,971

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Operating profit/(loss):
Wind	$	28,515		$	(1,440	)	$	27,150		$	(5,873	)
Grid	(2,870		)	(6,100		)	(5,537		)	(14,268		)
Unallocated corporate expenses	(918		)	(265		)	(2,013		)	(2,358		)
Total	$	24,727		$	(7,805	)	$	19,600		$	(22,499	)

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 profit (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 profit (loss).

Unallocated corporate expenses primarily consist of stock-based compensation expense of $0.8 million and $0.5 million, and restructuring charges of $0.1 million and less than $0.1 million, included in the three months ended September 30, 2018 and 2017, respectively. Unallocated corporate expenses primarily consist of stock-based compensation expense of $1.6 million and $1.2 million and restructuring charges of $0.4 million and $1.3 million, included in the six months ended September 30, 2018 and 2017, respectively, as well as a gain for the change in fair value of the contingent consideration of $0.2 million in each of the three and six months ended September 30, 2017.

Total assets for the two business segments as of September 30, 2018 and March 31, 2018 are as follows (in thousands):

	September 30, 2018		March 31, 2018
Wind	$	12,278	$	16,790
Grid	35,077		37,012
Corporate assets	58,150		34,373
Total	$	105,505	$	88,175

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Recent Accounting Pronouncements

6 Months Ended

Sep. 30, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Accounting Pronouncements

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 multiple amendments to ASU 2014-09 which are all effective for annual reporting periods beginning after December 15, 2017. 

As of April 1, 2018, the Company has adopted ASU 2014-09 and its amendments, reported the impact in its consolidated financial statements, and implemented changes to its business processes, systems and controls to support revenue recognition and the related disclosures under this ASU. The Company’s assessment included a detailed review of representative contracts from each of the Company’s revenue streams and a comparison of its historical accounting policies and practices to the new standard. The Company adopted the new standards retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective transition method) to all existing contracts that have remaining obligations as of April 1, 2018. Accordingly, the Company has elected to retroactively adjust only those contracts that do not meet the definition of a complete contract at the date of the initial application. This guidance will lead to recognizing certain revenue transactions sooner than in the past on certain contracts, as the Company will need to estimate the revenue it will be entitled to upon contract completion, and later on other contracts, such as Consulting and Statement of Work transactions, due to the lack of an enforceable right to payment for performance obligations satisfied over time. There are no changes in the accounting for its largest revenue stream which includes Inox Wind as its primary customer. Across other revenue streams such as D-VAR® Equipment and D-VAR® Turnkey, the timing of revenue recognition will be affected for multiple types of contracts, primarily multiple performance obligation contracts in its Grid business unit, but those differences did not have a material impact on its consolidated financial statements. The adjustment to opening accumulated deficit was not significant in the period commencing on April 1, 2018. Additionally, the adoption of this new standard is not expected to have any tax impact on the consolidated financial statements. As part of this analysis, the Company evaluated its information technology capabilities and systems, and did not incur significant information technology costs to modify systems currently in place.

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 adopted ASU 2016-01 effective April 1, 2018 and noted no significant impact to its consolidated financial statements.

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 and its amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years.

• In July 2018, the FASB issued ASU 2018-10, Codification improvements to Topic 842, Leases. The amendments in ASU 2018-10 provide more clarification in regards to the application and requirements of ASU 2016-02.

• In July 2018, the FASB issued ASU 2018-11, Topic 842, Leases - Targeted improvements. The amendments in ASU 2018-11 provide for the option to adopt the standard prospectively and recognize a cumulative-effect adjustment to the opening balance of retained earnings as well as offer a new practical expedient that will allow the Company to elect, by class of underlying asset, to not separate non-lease and lease components in certain circumstances and instead to account for those components as a single item.

The Company is currently evaluating the provisions of ASU 2016-02 and its amendments, and assessing the impact the adoption of this guidance will have on its financial position, results of operations and disclosures.  This process has included identifying the implementation team, applying the revised definition of a lease per ASC 842 to existing agreements, and from that information, creating a preliminary population. This population includes agreements identified from the following sources: existing leases under ASC 840, general ledger activity from recurring vendors and information reported from a survey provided to key individuals within the Company. The Company intends to make the policy election to exclude all leases shorter than 12 months from the recognition of the recording of the right of use ("ROU") asset and related liabilities. The Company expects to elect the package of three practical expedients in regards to all leases that commenced before the effective date as well as the practical expedient that allows the use of hindsight in determining lease term. The Company anticipates the adoption of this guidance will result in certain changes to its financial statements to add the related asset and liability accounts for all of its operating leases. The Company will continue to assess its agreements for any other impacts that may result from the adoption of this standard. During the second half of fiscal 2018, the Company plans to finalize its population of leases including the classification of type of lease for each of those agreements and assess its current controls, as well as identify and implement any changes that may be necessary to comply with the provisions of ASU 2016-02, which will be effective on April 1, 2019.

The Company is required to adopt the new standards in the first quarter of fiscal 2019 and expects to do so using the modified retrospective transition method, which will impact all leases existing at, or entered into after the period of adoption. For all leases existing at the time of adoption the Company will recognize a cumulative effect adjustment to its opening balance of retained earnings as of April 1, 2019. The Company is still evaluating the final impact of this adoption method on its consolidated financial statements.

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 consolidated financial statements.

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 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 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 adopted ASU 2016-15 and ASU 2016-18 effective April 1, 2018 and noted no significant impact to its consolidated financial statements.

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 adopted ASU 2016-16 effective April 1, 2018 and noted no significant impact to its consolidated financial statements.

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 ASU 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 adopted ASU 2017-05 effective April 1, 2018 and adjusted the opening balance of accumulated deficit for $0.1 million for recognition of the deferred gain on the sale of the 64 Jackson Road building that occurred on March 28, 2018.

In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation (Subtopic 718) Scope of Modification Accounting. The amendments in ASU 2017-09 provide clarity and reduce both (1) diversity in practice and (2) cost and complexity when applying the guidance in Topic 718, Compensation—Stock Compensation, to a change to the terms or conditions of a share-based payment award.  The ASU is effective for annual reporting periods beginning after December 15, 2017, including interim periods within those periods. The Company adopted ASU 2017-09 effective April 1, 2018 and noted no significant impact to its consolidated financial statements.

In July 2017, the FASB issued ASU 2017-11, Earnings per Share (Topic 260), Distinguishing Liabilities from Equity (Topic 480), and Derivatives and Hedging (Topic 815). The amendments in ASU 2017-11 provide guidance for freestanding equity-linked financial instruments, such as warrants and conversion options in convertible debt or preferred stock, and should no longer be accounted for as a derivative liability at fair value as a result of the existence of a down round feature. The ASU is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those periods. The Company is currently evaluating the impact the adoption of ASU 2017-11 and does not expect a significant impact on its consolidated financial statements, primarily due to the put option feature which requires continued liability classification under ASC 480.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The amendments in ASU 2017-12 provide improved financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. In addition, the amendments in this update make certain targeted improvements to simplify the application of the hedge accounting guidance. The ASU is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those periods. The Company is currently evaluating the impact the adoption of ASU 2017-12 may have on its consolidated financial statements.

In June 2018, the FASB issued ASU 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Non-Employee Share Based Payment Accounting. The amendments in ASU 2018-07 provide for the simplification of the measurement of share-based payment transactions for acquiring goods and services from non-employees. The ASU is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those periods. The Company is currently evaluating the impact of the adoption of ASU 2018-07 and does not expect it to have a significant impact on its consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in ASU 2018-13 provide for increased effectiveness of the disclosures made around fair value measurements while including consideration for costs and benefits. The ASU is effective for annual reporting periods beginning after December 15, 2019, including interim periods within those periods. The Company is currently evaluating the impact the adoption of ASU 2018-13 may have on its consolidated financial statements.

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Subsequent Events

6 Months Ended

Sep. 30, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

The Company has performed an evaluation of subsequent events through the time of filing this Quarterly Report on Form 10-Q with the SEC and has determined that there are no such events to report.

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Nature of the Business and Operations and Liquidity (Policies)

6 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of the Business and Operations

These unaudited condensed consolidated financial statements of the Company have been prepared on a going concern basis in accordance with United States generally accepted accounting principles (“GAAP”) and the Securities and Exchange Commission’s (“SEC”) instructions to Form 10-Q. The going concern basis of presentation assumes that the Company will continue operations and will be able to realize its assets and discharge its liabilities and commitments in the normal course of business. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those instructions. The year-end condensed balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. The unaudited condensed consolidated financial statements, in the opinion of management, reflect all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the results for the interim periods ended September 30, 2018 and 2017 and the financial position at September 30, 2018; however, these results are not necessarily indicative of results which may be expected for the full year. The interim condensed consolidated financial statements, and notes thereto, should be read in conjunction with the audited consolidated financial statements for the year ended March 31, 2018, and notes thereto, included in the Company’s annual report on Form 10-K for the year ended March 31, 2018 filed with the Securities and Exchange Commission on June 6, 2018.

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 multiple amendments to ASU 2014-09 which are all effective for annual reporting periods beginning after December 15, 2017. 

As of April 1, 2018, the Company has adopted ASU 2014-09 and its amendments, reported the impact in its consolidated financial statements, and implemented changes to its business processes, systems and controls to support revenue recognition and the related disclosures under this ASU. The Company’s assessment included a detailed review of representative contracts from each of the Company’s revenue streams and a comparison of its historical accounting policies and practices to the new standard. The Company adopted the new standards retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective transition method) to all existing contracts that have remaining obligations as of April 1, 2018. Accordingly, the Company has elected to retroactively adjust only those contracts that do not meet the definition of a complete contract at the date of the initial application. This guidance will lead to recognizing certain revenue transactions sooner than in the past on certain contracts, as the Company will need to estimate the revenue it will be entitled to upon contract completion, and later on other contracts, such as Consulting and Statement of Work transactions, due to the lack of an enforceable right to payment for performance obligations satisfied over time. There are no changes in the accounting for its largest revenue stream which includes Inox Wind as its primary customer. Across other revenue streams such as D-VAR® Equipment and D-VAR® Turnkey, the timing of revenue recognition will be affected for multiple types of contracts, primarily multiple performance obligation contracts in its Grid business unit, but those differences did not have a material impact on its consolidated financial statements. The adjustment to opening accumulated deficit was not significant in the period commencing on April 1, 2018. Additionally, the adoption of this new standard is not expected to have any tax impact on the consolidated financial statements. As part of this analysis, the Company evaluated its information technology capabilities and systems, and did not incur significant information technology costs to modify systems currently in place.

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 adopted ASU 2016-01 effective April 1, 2018 and noted no significant impact to its consolidated financial statements.

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 and its amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years.

• In July 2018, the FASB issued ASU 2018-10, Codification improvements to Topic 842, Leases. The amendments in ASU 2018-10 provide more clarification in regards to the application and requirements of ASU 2016-02.

• In July 2018, the FASB issued ASU 2018-11, Topic 842, Leases - Targeted improvements. The amendments in ASU 2018-11 provide for the option to adopt the standard prospectively and recognize a cumulative-effect adjustment to the opening balance of retained earnings as well as offer a new practical expedient that will allow the Company to elect, by class of underlying asset, to not separate non-lease and lease components in certain circumstances and instead to account for those components as a single item.

The Company is currently evaluating the provisions of ASU 2016-02 and its amendments, and assessing the impact the adoption of this guidance will have on its financial position, results of operations and disclosures.  This process has included identifying the implementation team, applying the revised definition of a lease per ASC 842 to existing agreements, and from that information, creating a preliminary population. This population includes agreements identified from the following sources: existing leases under ASC 840, general ledger activity from recurring vendors and information reported from a survey provided to key individuals within the Company. The Company intends to make the policy election to exclude all leases shorter than 12 months from the recognition of the recording of the right of use ("ROU") asset and related liabilities. The Company expects to elect the package of three practical expedients in regards to all leases that commenced before the effective date as well as the practical expedient that allows the use of hindsight in determining lease term. The Company anticipates the adoption of this guidance will result in certain changes to its financial statements to add the related asset and liability accounts for all of its operating leases. The Company will continue to assess its agreements for any other impacts that may result from the adoption of this standard. During the second half of fiscal 2018, the Company plans to finalize its population of leases including the classification of type of lease for each of those agreements and assess its current controls, as well as identify and implement any changes that may be necessary to comply with the provisions of ASU 2016-02, which will be effective on April 1, 2019.

The Company is required to adopt the new standards in the first quarter of fiscal 2019 and expects to do so using the modified retrospective transition method, which will impact all leases existing at, or entered into after the period of adoption. For all leases existing at the time of adoption the Company will recognize a cumulative effect adjustment to its opening balance of retained earnings as of April 1, 2019. The Company is still evaluating the final impact of this adoption method on its consolidated financial statements.

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 consolidated financial statements.

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 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 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 adopted ASU 2016-15 and ASU 2016-18 effective April 1, 2018 and noted no significant impact to its consolidated financial statements.

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 adopted ASU 2016-16 effective April 1, 2018 and noted no significant impact to its consolidated financial statements.

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 ASU 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 adopted ASU 2017-05 effective April 1, 2018 and adjusted the opening balance of accumulated deficit for $0.1 million for recognition of the deferred gain on the sale of the 64 Jackson Road building that occurred on March 28, 2018.

In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation (Subtopic 718) Scope of Modification Accounting. The amendments in ASU 2017-09 provide clarity and reduce both (1) diversity in practice and (2) cost and complexity when applying the guidance in Topic 718, Compensation—Stock Compensation, to a change to the terms or conditions of a share-based payment award.  The ASU is effective for annual reporting periods beginning after December 15, 2017, including interim periods within those periods. The Company adopted ASU 2017-09 effective April 1, 2018 and noted no significant impact to its consolidated financial statements.

In July 2017, the FASB issued ASU 2017-11, Earnings per Share (Topic 260), Distinguishing Liabilities from Equity (Topic 480), and Derivatives and Hedging (Topic 815). The amendments in ASU 2017-11 provide guidance for freestanding equity-linked financial instruments, such as warrants and conversion options in convertible debt or preferred stock, and should no longer be accounted for as a derivative liability at fair value as a result of the existence of a down round feature. The ASU is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those periods. The Company is currently evaluating the impact the adoption of ASU 2017-11 and does not expect a significant impact on its consolidated financial statements, primarily due to the put option feature which requires continued liability classification under ASC 480.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The amendments in ASU 2017-12 provide improved financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. In addition, the amendments in this update make certain targeted improvements to simplify the application of the hedge accounting guidance. The ASU is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those periods. The Company is currently evaluating the impact the adoption of ASU 2017-12 may have on its consolidated financial statements.

In June 2018, the FASB issued ASU 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Non-Employee Share Based Payment Accounting. The amendments in ASU 2018-07 provide for the simplification of the measurement of share-based payment transactions for acquiring goods and services from non-employees. The ASU is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those periods. The Company is currently evaluating the impact of the adoption of ASU 2018-07 and does not expect it to have a significant impact on its consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in ASU 2018-13 provide for increased effectiveness of the disclosures made around fair value measurements while including consideration for costs and benefits. The ASU is effective for annual reporting periods beginning after December 15, 2019, including interim periods within those periods. The Company is currently evaluating the impact the adoption of ASU 2018-13 may have on its consolidated financial statements.

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Revenue Recognition (Tables)

6 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Cumulative effect of ASU 2014-09

The cumulative effect to the Company’s consolidated April 1, 2018 balance sheet from the adoption of the new revenue standard and the sale of nonfinancial assets was as follows (in thousands):

	March 31, 2018			Opening Adjustment			April 1, 2018
Assets:
Accounts Receivable	$	7,365		$	(678	)	$	6,687
Inventory	19,780			(1,599		)	18,181
Prepaid expenses and other current assets	2,947			2,277			5,224
Notes receivable, long term portion	2,559			105			2,664
Liabilities and Stockholders' Equity:
Accounts payable and accrued expenses	$	(12,625	)	$	(2,729	)	$	(15,354	)
Deferred revenue	(13,483		)	2,657			(10,826		)
Accumulated deficit	$	(988,333	)	$	(33	)	$	(988,366	)

Disaggregation of Revenue

The following tables disaggregate the Company’s revenue by product line and by shipment destination:

	Three Months Ended September 30, 2018				Six Months Ended September 30, 2018
Product Line:	Grid		Wind		Grid		Wind
Equipment and systems	$	5,503	$	7,219	$	12,957	$	10,711
Services and technology development	2,066		88		3,541		274
Total	$	7,569	$	7,307	$	16,498	$	10,985
Region:
Americas	$	5,052	$	24	$	12,548	$	47
Asia Pacific	2,308		7,278		3,115		10,873
EMEA	209		5		835		65
Total	$	7,569	$	7,307	$	16,498	$	10,985

Contract with Customer

Changes in the Company’s contract assets, which are included in “Unbilled AR” and "Deferred program costs" (see Note 7, “Accounts Receivable” and Note 8, "Inventory" for a reconciliation to the condensed consolidated balance sheet) and contract liabilities, which are included in the current portion and long term portion of “deferred revenue” in the Company’s condensed consolidated balance sheets, are as follows:

	Unbilled AR			Deferred Program Costs			Contract Liabilities
Beginning balance as of March 31, 2018	$	3,016		$	2,567		$	21,937
Impact of adoption of ASC 606	—			(1,599		)	(2,657		)
Increases for costs incurred to fulfill performance obligations	—			1,267			—
Increase (decrease) due to customer billings	(7,886		)	—			7,828
Decrease due to cost recognition on completed performance obligations	—			(1,033		)	—
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	7,439			(9		)	(8,296		)
Other changes and FX impact	(19		)	24			(864		)
Ending balance as of September 30, 2018	$	2,550		$	1,217		$	17,948

Schedule of Revenues by Major Customers

The following table sets forth customers who represented 10% or more of the Company’s total revenues for the three and six months ended September 30, 2018 and 2017:

	Reportable	Three months ended September 30,				Six months ended September 30,
	Segment	2018		2017		2018		2017
Inox Wind Limited	Wind	45	%	46	%	36	%	35	%
Vestas	Grid	11	%	—	%	23	%	—	%
Quanta Power	Grid	12	%	—	%	<10%		—	%
U.S. Navy	Grid	<10%		—	%	<10%		16	%
YMC Inc.	Grid	—	%	15	%	—	%	<10%

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Stock-Based Compensation (Tables)

6 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense by financial statement line item for the three and six months ended September 30, 2018 and 2017 (in thousands):

	Three months ended September 30,				Six months ended September 30,
	2018		2017		2018		2017
Cost of revenues	$	50	$	23	$	90	$	59
Research and development	70		61		121		110
Selling, general and administrative	705		394		1,399		1,063
Total	$	825	$	478	$	1,610	$	1,232

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Computation of Net Income (Loss) per Common Share (Tables)

6 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Reconciliation of Numerators and Denominators of EPS Calculation

The following table reconciles the numerators and denominators of the earnings per share calculation for the three and six months ended September 30, 2018 and 2017 (in thousands, except per share data):

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Numerator:
Net income (loss)	$	22,558		$	(7,281	)	$	17,821		$	(22,533	)
Denominator:
Weighted-average shares of common stock outstanding	21,252			19,531			21,126			18,316
Weighted-average shares subject to repurchase	(939		)	(471		)	(886		)	(391		)
Shares used in per-share calculation ― basic	20,313			19,060			20,240			17,925
Shares used in per-share calculation ― diluted	20,581			19,060			20,560			17,925
Net income (loss) per share ― basic	$	1.11		$	(0.38	)	$	0.88		$	(1.26	)
Net income (loss) per share ― diluted	$	1.10		$	(0.38	)	$	0.87		$	(1.26	)

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Fair Value Measurements (Tables)

6 Months Ended

Sep. 30, 2018

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 September 30, 2018 and March 31, 2018 (in thousands):

	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2018:
Assets:
Cash equivalents	$	46,841	$	46,841	$	—	$	—
Derivative liabilities:
Warrants	1,399		—		—		1,399

	Total Carrying Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2018:
Assets:
Cash equivalents	$	32,589	$	32,589	$	—	$	—
Derivative liabilities:
Warrants	$	1,217	$	—	$	—	$	1,217

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, 2018	$	1,217
Mark to market adjustment	182
Balance at September 30, 2018	$	1,399

	Warrants			Acquisition Contingent Consideration
April 1, 2017	$	1,923		$	—
Issuance of contingent consideration	—			571
Mark to market adjustment	(1,069		)	(201		)
Balance at September 30, 2017	$	854		$	370

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Accounts Receivable (Tables)

6 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable at September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

	September 30, 2018		March 31, 2018
Accounts receivable (billed)	$	5,072	$	4,403
Accounts receivable (unbilled)	2,550		3,016
Less: Allowance for doubtful accounts	—		(54		)
Accounts receivable, net	$	7,622	$	7,365

Note receivable as of September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

Current assets	September 30, 2018			March 31, 2018
Note receivable, current	$	3,000		$	3,000
Total current note receivable	$	3,000		$	3,000
Long term assets
Note receivable, long term	$	3,000		$	3,000
Note receivable discount	(224		)	(336		)
Deferred gain on sale	—			(105		)
Total long term note receivable	$	2,776		$	2,559

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Inventory (Tables)

6 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventory, net of reserves, at September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

	September 30, 2018		March 31, 2018
Raw materials	$	5,996	$	7,526
Work-in-process	2,306		920
Finished goods	6,716		8,767
Deferred program costs	1,217		2,567
Net inventory	$	16,235	$	19,780

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Note Receivable (Tables)

6 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Schedule of Notes Receivable

Accounts receivable at September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

	September 30, 2018		March 31, 2018
Accounts receivable (billed)	$	5,072	$	4,403
Accounts receivable (unbilled)	2,550		3,016
Less: Allowance for doubtful accounts	—		(54		)
Accounts receivable, net	$	7,622	$	7,365

Note receivable as of September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

Current assets	September 30, 2018			March 31, 2018
Note receivable, current	$	3,000		$	3,000
Total current note receivable	$	3,000		$	3,000
Long term assets
Note receivable, long term	$	3,000		$	3,000
Note receivable discount	(224		)	(336		)
Deferred gain on sale	—			(105		)
Total long term note receivable	$	2,776		$	2,559

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Property, Plant and Equipment (Tables)

6 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Abstract]

Schedule of Costs and Accumulated Depreciation of Plant and Equipment

The cost and accumulated depreciation of property and equipment at September 30, 2018 and March 31, 2018 are as follows (in thousands):

	September 30, 2018			March 31, 2018
Construction in progress - equipment	597			654
Equipment and software	45,797			72,760
Furniture and fixtures	1,307			1,878
Leasehold improvements	1,838			1,426
Property, plant and equipment, gross	49,539			76,718
Less accumulated depreciation	(38,957		)	(64,205		)
Property, plant and equipment, net	$	10,582		$	12,513

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Accounts Payable and Accrued Expenses (Tables)

6 Months Ended

Sep. 30, 2018

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses at September 30, 2018 and March 31, 2018 consisted of the following (in thousands):

	September 30, 2018		March 31, 2018
Accounts payable	$	3,934	$	3,096
Accrued inventories in-transit	411		1,207
Accrued other miscellaneous expenses	2,836		2,412
Advanced deposits	890		—
Accrued compensation	3,424		3,605
Income taxes payable	2,049		536
Accrued warranty	1,760		1,769
Total	$	15,304	$	12,625

Schedule of Product Warranty Activity

Product warranty activity was as follows (in thousands):

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Balance at beginning of period	$	1,752		$	2,026		$	1,769		$	2,344
Change in accruals for warranties during the period	213			86			317			127
Settlements during the period	(205		)	(260		)	(326		)	(619		)
Balance at end of period	$	1,760		$	1,852		$	1,760		$	1,852

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Warrants and Derivative Liabilities (Tables)

6 Months Ended

Sep. 30, 2018

November 2014 Warrant

Class Of Warrant Or Right [Line Items]

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

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

Fiscal Year 18	September 30, 2018	June 30, 2018
Risk-free interest rate	2.62%	2.40%
Expected annual dividend yield	—	—
Expected volatility	63.66%	67.40%
Term (years)	1.12	1.37
Fair value	$1.3 million	$1.6 million

Fiscal Year 17	March 31, 2018	December 31, 2017	September 30, 2017	June 30, 2017	March 31, 2017
Risk-free interest rate	2.20%	1.87%	1.49%	1.44%	1.41%
Expected annual dividend yield	—	—	—	—	—
Expected volatility	65.86%	65.86%	65.64%	67.21%	66.53%
Term (years)	1.62	1.87	2.12	2.37	2.62
Fair value	$1.1 million	$0.4 million	$0.8 million	$0.9 million	$1.8 million

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Restructuring (Tables)

6 Months Ended

Sep. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring Costs

The following table presents restructuring charges and cash payments for the six months ended September 30, 2018 and 2017(in thousands):

	Severance pay			Facility exit and
	and benefits			Relocation costs			Total
Accrued restructuring balance at April 1, 2018	$	262		$	173		$	435
Charges to operations	—			403			403
Cash payments	(173		)	(576		)	(749		)
Accrued restructuring balance at September 30, 2018	$	89		$	—		$	89

	Severance pay			Facility exit and
	and benefits			Relocation costs		Total
Accrued restructuring balance at April 1, 2017	$	—		$	—	$	—
Charges to operations	1,328			—		1,328
Cash payments	(746		)	—		(746		)
Accrued restructuring balance at September 30, 2017	$	582		$	—	$	582

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Business Segments (Tables)

6 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Schedule of Operating Results for Business Segments

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

	Three months ended September 30,				Six months ended September 30,
	2018		2017		2018		2017
Revenues:
Wind	$	7,307	$	5,554	$	10,985	$	7,831
Grid	7,569		5,495		16,498		12,140
Total	$	14,876	$	11,049	$	27,483	$	19,971

	Three months ended September 30,						Six months ended September 30,
	2018			2017			2018			2017
Operating profit/(loss):
Wind	$	28,515		$	(1,440	)	$	27,150		$	(5,873	)
Grid	(2,870		)	(6,100		)	(5,537		)	(14,268		)
Unallocated corporate expenses	(918		)	(265		)	(2,013		)	(2,358		)
Total	$	24,727		$	(7,805	)	$	19,600		$	(22,499	)

Schedule of Total Assets for Segments

Total assets for the two business segments as of September 30, 2018 and March 31, 2018 are as follows (in thousands):

	September 30, 2018		March 31, 2018
Wind	$	12,278	$	16,790
Grid	35,077		37,012
Corporate assets	58,150		34,373
Total	$	105,505	$	88,175

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Nature of the Business and Operations and Liquidity - Additional Information (Detail) $ in Thousands							1 Months Ended		3 Months Ended		6 Months Ended		78 Months Ended
	May 06, 2019	Jul. 04, 2018 USD ($)	Jul. 03, 2018 USD ($) installment	Mar. 28, 2018 USD ($)	Feb. 01, 2018 USD ($)	May 10, 2017 USD ($)	May 26, 2017 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2018 USD ($) employee	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) employee	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) employee	Mar. 31, 2018 USD ($)
Description Of Business [Line Items]
Retained earnings (accumulated deficit)									$ (970,479)		$ (970,479)		$ (970,479)	$ (988,333)
Cash and cash equivalents									56,169		56,169		$ 56,169	34,084
Net cash used in operating activities											23,595	$ (13,539)
Net Sinovel settlement									$ 28,720	$ 0	$ 28,720	0
Number of workforce persons | employee									225		225		225
Cash flows from financing activities											$ (325)	$ 15,188	$ 84,900
Proceeds from additional equity offering						$ 17,000	$ 17,000
Notes receivable, long term portion									$ 2,776		$ 2,776		$ 2,776	$ 2,559
Sinovel Wind Group Co. Ltd.
Description Of Business [Line Items]
Net Sinovel settlement									$ 28,700
Sinovel settlement			$ 57,500
Proceeds from settlement		$ 32,500
Number of installments | installment			2
Settlement, amount awarded		$ 25,000
64 Jackson LLC
Description Of Business [Line Items]
Purchase and sale agreement, total consideration				$ 23,000	$ 23,000
Purchase and sale agreement, sale of property				17,000
Notes receivable, long term portion				6,000	$ 6,000
Purchase and sale agreement, proceeds from sale of property, plant and equipment, net				$ 16,900
Interest rate				1.96%					1.96%		1.96%		1.96%
Inox Wind Limited
Description Of Business [Line Items]
Strategic agreements value								$ 210,000
Manufacturing agreement period, additional period required								3 years
Forecast | Sinovel Wind Group Co. Ltd.
Description Of Business [Line Items]
Payment period	10 months

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Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2018	Mar. 31, 2018
Product Warranty Liability [Line Items]
Revenue recognized, percentage	87.00%
Minimum
Product Warranty Liability [Line Items]
Warranty period	1 year
Maximum
Product Warranty Liability [Line Items]
Warranty period	2 years
Extended service warranty, term	4 years
Accounting Standards Update 2014-09
Product Warranty Liability [Line Items]
Adjustment to retained earnings (less than)		$ 0.1
Accounting Standards Update 2017-05
Product Warranty Liability [Line Items]
Adjustment to retained earnings (less than)		$ 0.1

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Revenue Recognition - Cumulative Effect of ASU 2014-09 (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Apr. 01, 2018	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 7,622		$ 7,365
Inventory	16,235		19,780
Prepaid expenses and other current assets	3,339		2,947
Notes receivable, long term portion	2,776		2,559
Accounts payable and accrued expenses	(15,304)		(12,625)
Deferred revenue	(7,891)		(8,454)
Accumulated deficit	$ (970,479)		(988,333)
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net		$ 6,687
Inventory		18,181
Prepaid expenses and other current assets		5,224
Notes receivable, long term portion		2,664
Accounts payable and accrued expenses		(15,354)
Deferred revenue		(10,826)
Accumulated deficit		$ (988,366)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net			(678)
Inventory			(1,599)
Prepaid expenses and other current assets			2,277
Notes receivable, long term portion			105
Accounts payable and accrued expenses			(2,729)
Deferred revenue			2,657
Accumulated deficit			(33)
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net			7,365
Inventory			19,780
Prepaid expenses and other current assets			2,947
Notes receivable, long term portion			2,559
Accounts payable and accrued expenses			(12,625)
Deferred revenue			(13,483)
Accumulated deficit			$ (988,333)

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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Grid
Disaggregation of Revenue [Line Items]
Revenue	$ 7,569	$ 16,498
Grid | Americas
Disaggregation of Revenue [Line Items]
Revenue	5,052	12,548
Grid | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	2,308	3,115
Grid | EMEA
Disaggregation of Revenue [Line Items]
Revenue	209	835
Grid | Equipment and systems
Disaggregation of Revenue [Line Items]
Revenue	5,503	12,957
Grid | Services and technology development
Disaggregation of Revenue [Line Items]
Revenue	2,066	3,541
Wind
Disaggregation of Revenue [Line Items]
Revenue	7,307	10,985
Wind | Americas
Disaggregation of Revenue [Line Items]
Revenue	24	47
Wind | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	7,278	10,873
Wind | EMEA
Disaggregation of Revenue [Line Items]
Revenue	5	65
Wind | Equipment and systems
Disaggregation of Revenue [Line Items]
Revenue	7,219	10,711
Wind | Services and technology development
Disaggregation of Revenue [Line Items]
Revenue	$ 88	$ 274

XML

Revenue Recognition - Contract Asset and Liability (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2018 USD ($)
Contract With Customer, Asset And Liability [Roll Forward]
Unbilled AR, Beginning balance as of March 31, 2018	$ 3,016
Deferred Program Costs, Beginning balance as of March 31, 2018	2,567
Contract Liabilities, Beginning balance as of March 31, 2018	21,937
Deferred Program Costs, Increases for costs incurred to fulfill performance obligations	1,267
Unbilled AR, Increase (decrease) due to customer billings	(7,886)
Contract Liabilities, Increases (decreases) due to customer billings	7,828
Deferred Program Costs, Decrease due to cost recognition on completed performance obligations	(1,033)
Unbilled AR, Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	7,439
Deferred Program Costs, Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	(9)
Contract Liabilities, Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations	(8,296)
Unbilled AR, Other changes and FX impact	(19)
Deferred Program Costs, Other changes and FX impact	24
Contract Liabilities, Other changes and FX impact	(864)
Unbilled AR, Ending balance as of June 30, 2018	2,550
Deferred Program Costs, Ending Balance as of June 30, 2018	1,217
Contract Liabilities, Ending balance as of June 30, 2018	17,948
Accounting Standards Update 2014-09
Contract With Customer, Asset And Liability [Roll Forward]
Unbilled AR, Impact of adoption of ASC 606	0
Deferred Program Costs, Impact of adoption of ASC 606	(1,599)
Contract Liabilities, Impact of adoption of ASC 606	$ (2,657)

XML

Revenue Recognition - Performance obligations (Details) $ in Millions	Sep. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction	12 months
Remaining performance obligation	$ 52.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 7.1
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction	13 months
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction	60 months

XML

Revenue Recognition - Schedule of Revenue by Customers (Details) - Customer concentration risk - Revenue	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Wind | Inox Wind Limited
Revenue, Major Customer [Line Items]
Concentration risk, revenue	45.00%	46.00%	36.00%	35.00%
Grid | Vestas WTG Mexico
Revenue, Major Customer [Line Items]
Concentration risk, revenue	11.00%	0.00%	23.00%	0.00%
Grid | Quanta Power
Revenue, Major Customer [Line Items]
Concentration risk, revenue	12.00%	0.00%		0.00%
Grid | U.S. Navy
Revenue, Major Customer [Line Items]
Concentration risk, revenue		0.00%		16.00%
Grid | YMC Inc.
Revenue, Major Customer [Line Items]
Concentration risk, revenue	0.00%	15.00%	0.00%

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Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 825	$ 478	$ 1,610	$ 1,232
Cost of revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	50	23	90	59
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	70	61	121	110
Selling, general and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 705	$ 394	$ 1,399	$ 1,063

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Immediately vested common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)			37,075	37,140
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)			413,000	795,500
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures	$ 3.6		$ 3.6
Weighted-average period over which unrecognized compensation expense is expected to be recognized			1 year 11 months
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)				16,667
Vesting period			8 days
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	$ 0.1		$ 0.1
Weighted-average period over which unrecognized compensation expense is expected to be recognized			6 months 18 days
Options granted in period (in shares)	0	0	0	0
Minimum | Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			2 years	2 years
Maximum | Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years	3 years

XML

Computation of Net Income (Loss) per Common Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from calculation of diluted EPS (in shares)	1.6	1.5	1.4	1.5
Stock options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from calculation of diluted EPS (in shares)	0.3	0.3	0.2	0.3
Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from calculation of diluted EPS (in shares)	0.9	1.2	0.9	1.2
Stock awards
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from calculation of diluted EPS (in shares)	0.4		0.3

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Computation of Net Income (Loss) per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income (loss)	$ 22,558	$ (7,281)	$ 17,821	$ (22,533)
Denominator:
Weighted-average shares of common stock outstanding (in shares)	21,252	19,531	21,126	18,316
Weighted-average shares subject to repurchase (in shares)	(939)	(471)	(886)	(391)
Shares used in per-share calculation ― basic (in shares)	20,313	19,060	20,240	17,925
Shares used in per-share calculation ― diluted (in shares)	20,581	19,060	20,560	17,925
Net income (loss) per share ― basic (in dollars per share)	$ 1.11	$ (0.38)	$ 0.88	$ (1.26)
Net income (loss) per share ― diluted (in dollars per share)	$ 1.10	$ (0.38)	$ 0.87	$ (1.26)

XML

Acquisition and Related Goodwill - Additional Information (Details) $ in Thousands	Sep. 25, 2017 USD ($) company	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill allocated		$ 1,719	$ 1,719
Number of merged companies | company	2
Infinia Technology Corporation (ITC)
Business Acquisition [Line Items]
Consideration transferred, excluding contingent consideration	$ 3,800
Goodwill allocated		$ 1,700

XML

Fair Value Measurements - Schedule of Assets and Liabilities Carried at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	$ 46,841	$ 32,589
Derivative liabilities	1,399	1,217
Reported value measurement | Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	46,841	32,589
Reported value measurement | Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Reported value measurement | Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative liabilities	1,399	1,217	$ 854	$ 1,923
Warrants | Reported value measurement | Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Warrants | Reported value measurement | Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Warrants | Reported value measurement | Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative liabilities	$ 1,399	$ 1,217

XML

Fair Value Measurements - Schedule of Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,217
Ending balance	1,399
Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,217	$ 1,923
Issuance of contingent consideration		0
Mark to market adjustment	182	(1,069)
Ending balance	$ 1,399	854
Acquisition Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		0
Issuance of contingent consideration		571
Mark to market adjustment		(201)
Ending balance		$ 370

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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions		6 Months Ended
	Jan. 05, 2018	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Period for Make Whole Payment		90 days
Make Whole Payment	$ 0.7

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Accounts Receivable - Schedule of Accounts Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Receivables [Abstract]
Accounts receivable (billed)	$ 5,072	$ 4,403
Accounts receivable (unbilled)	2,550	3,016
Less: Allowance for doubtful accounts	0	(54)
Accounts receivable, net	$ 7,622	$ 7,365

XML

Inventory - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 5,996	$ 7,526
Work-in-process	2,306	920
Finished goods	6,716	8,767
Deferred program costs	1,217	2,567
Net inventory	$ 16,235	$ 19,780

XML

Inventory - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Inventory Disclosure [Abstract]
Provision for excess and obsolete inventory	$ 400	$ 100	$ 514	$ 351

XML

Note Receivable - Additional Information (Details) $ in Thousands			6 Months Ended
	Mar. 28, 2018 USD ($)	Feb. 01, 2018 USD ($)	Sep. 30, 2018 USD ($) installment	Mar. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, long term portion			$ 2,776	$ 2,559
Note receivable discount			224	336
Deferred gain on sale			$ 0	$ 105
64 Jackson LLC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchase and sale agreement, total consideration	$ 23,000	$ 23,000
Security deposit		1,000
Notes receivable, long term portion	$ 6,000	$ 6,000
Number of installments | installment			2
Installment amount			$ 3,000
Interest rate	1.96%		1.96%
Notes receivable, present value			$ 5,700
Discount rate			6.00%
Note receivable discount			$ 300
Deferred gain on sale			$ 100

XML

Note Receivable - Schedule of Note Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Current assets
Note receivable, current	$ 3,000	$ 3,000
Note receivable, current portion	3,000	3,000
Long term assets
Note receivable, long term	3,000	3,000
Note receivable discount	(224)	(336)
Deferred gain on sale	0	(105)
Note receivable	$ 2,776	$ 2,559

XML

Property, Plant and Equipment - Schedule of Costs and Accumulated Depreciation (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 49,539	$ 76,718
Less accumulated depreciation	(38,957)	(64,205)
Property, plant and equipment, net	10,582	12,513
Construction in progress - equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	597	654
Equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	45,797	72,760
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,307	1,878
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,838	$ 1,426

XML

Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 1.1	$ 3.2	$ 2.1	$ 7.5
Change inrevised estimate of remaining useful lives | Cost of goods sold
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 1.6		$ 4.1

XML

Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Payables and Accruals [Abstract]
Accounts payable	$ 3,934		$ 3,096
Accrued inventories in-transit	411		1,207
Accrued other miscellaneous expenses	2,836		2,412
Advanced deposits	890		0
Accrued compensation	3,424		3,605
Income taxes payable	2,049		536
Accrued warranty	1,760	$ 1,752	1,769	$ 1,852	$ 2,026	$ 2,344
Total	$ 15,304		$ 12,625

XML

Accounts Payable and Accrued Expenses - Additional Information (Detail)	6 Months Ended
	Sep. 30, 2018
Minimum
Product Warranty Liability [Line Items]
Warranty period	1 year
Maximum
Product Warranty Liability [Line Items]
Warranty period	2 years

XML

Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Movement in Extended Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 1,752	$ 2,026	$ 1,769	$ 2,344
Change in accruals for warranties during the period	213	86	317	127
Settlements during the period	(205)	(260)	(326)	(619)
Balance at end of period	$ 1,760	$ 1,852	$ 1,760	$ 1,852

XML

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 3,008	$ (171)	$ 2,964	$ (71)

XML

Warrants and Derivative Liabilities - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Dec. 19, 2014	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018	Nov. 13, 2014
Derivative [Line Items]
Change in fair value of warrants and contingent consideration		$ 282	$ 144	$ (182)	$ 1,069
November 2014 Warrant
Derivative [Line Items]
Warrants expiration date				Nov. 13, 2019
Common stock units offered (in shares)							909,090
Warrants 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)							$ 7.81
Change in fair value of warrants and contingent consideration		$ 300	$ 100	$ (200)	$ 1,000
Senior secured loan | Hercules Technology Growth Capital | First Warrant
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock (in shares)				13,927
Senior secured loan | Hercules Technology Growth Capital | Second Warrant
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock (in shares)				25,641
Senior secured loan | Hercules Technology Growth Capital | Hercules Warrants
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock (in shares)	58,823
Warrant exercise price (in dollars per share)		$ 7.85		$ 7.85
Warrants expiration date				Jun. 30, 2020
Warrant fair value		$ 100		$ 100		$ 100

XML

Warrants and Derivative Liabilities - Schedule of Assumptions Used to Calculate the Fair Value of Exchanged Warrants (Detail) - November 2014 Warrant $ in Millions	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)
Derivative [Line Items]
Fair value	$ 1.3	$ 1.6	$ 1.1	$ 0.4	$ 0.8	$ 0.9	$ 1.8
Risk-free interest rate
Derivative [Line Items]
Measurement inputs	0.0262	0.0240	0.0220	0.0187	0.0149	0.0144	0.0141
Expected annual dividend yield
Derivative [Line Items]
Measurement inputs	0	0	0	0	0	0	0
Expected volatility
Derivative [Line Items]
Measurement inputs	0.6366	0.6740	0.6586	0.6586	0.6564	0.6721	0.6653
Term (years)
Derivative [Line Items]
Term (years)	1 year 1 month 13 days	1 year 4 months 13 days	1 year 7 months 13 days	1 year 10 months 13 days	2 years 1 month 13 days	2 years 4 months 13 days	2 years 7 months 13 days

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Stockholders' Equity - Additional Information (Detail) - USD ($)			1 Months Ended
	May 26, 2017	May 10, 2017	May 26, 2017
Class of Stock [Line Items]
Proceeds from additional equity offering		$ 17,000,000	$ 17,000,000
Public stock offering
Class of Stock [Line Items]
Common stock, shares issued (in shares)		4,000,000
Sale of stock, price per share (in dollars per share)		$ 4.00
Proceeds from additional equity offering		$ 14,700,000
Over-allotment option
Class of Stock [Line Items]
Common stock, shares issued (in shares)		600,000
Proceeds from additional equity offering	$ 2,300,000
Over allotment common stock options period (in shares)		30 days
ATM issuance sales agreement
Class of Stock [Line Items]
Maximum value of shares for sale		$ 10,000,000.0

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Commitments and Contingencies - Additional Information (Detail) $ in Thousands	May 06, 2019 USD ($)	Jul. 04, 2018 USD ($)	Jul. 03, 2018 USD ($) installment	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)
Commitments And Contingencies [Line Items]
Restricted cash included in long-term assets				$ 165	$ 165
Sinovel Wind Group Co. Ltd.
Commitments And Contingencies [Line Items]
Proceeds from settlement			$ 57,500
Number of installments | installment			2
Settlement, amount awarded		$ 32,500
Payment period			10 months
Forecast | Sinovel Wind Group Co. Ltd.
Commitments And Contingencies [Line Items]
Settlement, amount awarded	$ 25,000

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Restructuring - Schedule of Charges and Payments (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 04, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated, period percent	8.00%
Restructuring Reserve [Roll Forward]
Accrued restructuring beginning balance				$ 435	$ 0
Charges to operations		$ 93	$ (12)	403	1,328
Cash payments				(749)	(746)
Accrued restructuring ending balance		89	582	89	582
Employee Severance
Restructuring Reserve [Roll Forward]
Charges to operations					1,300
Severance pay and benefits
Restructuring Reserve [Roll Forward]
Accrued restructuring beginning balance				262	0
Charges to operations				0	1,328
Cash payments				(173)	(746)
Accrued restructuring ending balance		89	582	89	582
Facility Exit And Relocation Costs
Restructuring Cost and Reserve [Line Items]
Exit costs				400
Restructuring Reserve [Roll Forward]
Accrued restructuring beginning balance				173	0
Charges to operations				403	0
Cash payments				(576)	0
Accrued restructuring ending balance		$ 0	$ 0	$ 0	0
Former executive officer | Severance pay and benefits
Restructuring Cost and Reserve [Line Items]
Period of post employment salary	18 months
Share multiplier, unpaid cash owed percentage				120.00%
Restructuring Reserve [Roll Forward]
Charges to operations					$ 500

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Business Segments - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment MW	Sep. 30, 2017 USD ($)	Mar. 31, 2018 segment
Segment Reporting Information [Line Items]
Number of reportable business segments | segment			2		2
Stock-based compensation expense	$ 825	$ 478	$ 1,610	$ 1,232
Restructuring charges (less than $0.1 million)	93	(12)	403	1,328
Gain on fair value of contingent consideration	0	201	0	201
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Stock-based compensation expense	800	500	1,600	1,200
Restructuring charges (less than $0.1 million)	$ 100	$ 100	$ 400	$ 1,300
Minimum
Segment Reporting Information [Line Items]
Megawatts of drive trains and power ratings | MW			2

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Business Segments - Operating Results for Two Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 14,876	$ 11,049	$ 27,483	$ 19,971
Operating profit/(loss)	24,727	(7,805)	19,600	(22,499)
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Operating profit/(loss)	(918)	(265)	(2,013)	(2,358)
Wind
Segment Reporting Information [Line Items]
Revenues	7,307	5,554	10,985	7,831
Wind | Operating Segments
Segment Reporting Information [Line Items]
Operating profit/(loss)	28,515	(1,440)	27,150	(5,873)
Grid
Segment Reporting Information [Line Items]
Revenues	7,569	5,495	16,498	12,140
Grid | Operating Segments
Segment Reporting Information [Line Items]
Operating profit/(loss)	$ (2,870)	$ (6,100)	$ (5,537)	$ (14,268)

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Business Segments - Total Business Segments Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 105,505	$ 88,175
Operating Segments | Wind
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	12,278	16,790
Operating Segments | Grid
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	35,077	37,012
Corporate assets
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 58,150	$ 34,373

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Recent Accounting Pronouncements - Narrative (Details) $ in Millions	Mar. 31, 2018 USD ($)
Accounting Standards Update 2017-05
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to retained earnings	$ 0.1