Document And Entity Information
Finite-lived Intangibles Assets
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles
Note To Financial Statement Details Textual
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Net identifiable intangible assets/(liabilities)
Note 2 - Acquisitions
Note 3 - Revenue Recognition
Note 4 - Stock-based Compensation
Risk-free interest rate
Note 5 - Computation of Net Loss Per Common Share
Note 6 - Goodwill and Other Intangibles
Trade names and trademarks
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets
Note 7 - Fair Value Measurements
Note 8 - Accounts Receivable
Note 9 - Inventory
Note 10 - Property, Plant and Equipment
Income Tax Disclosure [Text Block]
Note 11 - Accounts Payable and Accrued Expenses
Note 13 - Contingent Consideration
Note 15 - Leases
Cash and short-term investments
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
Note 17 - Business Segments
Inventory
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
Expected volatility
Note 2 - Acquisitions - Purchase Price (Details)
us-gaap_LiabilitiesCurrent
Total current liabilities
Note 2 - Acquisitions - Purchase Price (Details) (Parentheticals)
Note 2 - Acquisitions - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details)
Note 2 - Acquisitions - Unaudited Pro Forma Operating Results (Details)
Note 3 - Revenue Recognition - Disaggregation of Revenue (Details)
Expected life (years) (Year)
Issuance of 301,556 shares of Company's common stock
us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Issuance of 873,657 shares of Company’s common stock
Note 3 - Revenue Recognition - Contract Assets and Liabilities (Details)
Note 3 - Revenue Recognition - Revenues by Major Customers (Details)
us-gaap_BusinessCombinationConsiderationTransferred1
Business Combination, Consideration Transferred, Total
Total consideration
Note 4 - Stock-based Compensation - Stock-based Compensation Expense by Financial Statement Line Item (Details)
Note 4 - Stock-based Compensation - Weighted Average Assumptions (Details)
Note 5 - Computation of Net Loss Per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Details)
Note 6 - Goodwill and Other Intangibles - Goodwill (Details)
Note 6 - Goodwill and Other Intangibles - Intangible Assets (Details)
Contingent consideration
us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
Note 6 - Goodwill and Other Intangibles - Expected Future Amortization Expense (Details)
Note 7 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details)
Note 7 - Fair Value Measurements - Derivative Liability Measured at Fair value (Details)
us-gaap_LiabilityForUncertainTaxPositionsCurrent
Liability for Uncertainty in Income Taxes, Current
Note 8 - Accounts Receivable - Summary of Accounts Receivable (Details)
Note 9 - Inventory - Summary of Net Inventory (Details)
Note 10 - Property, Plant and Equipment - Cost and Accumulated Depreciation of Property and Equipment (Details)
Note 11 - Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Details)
Contingent consideration
Proceeds from the maturity of marketable securities
Note 11 - Accounts Payable and Accrued Expenses - Product Warranty Activity (Details)
Note 13 - Contingent Consideration - Summary of the Key Assumptions Used to Calculate Fair Value of Warrants (Details)
us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Basic (in dollars per share)
Note 15 - Leases - Operating Lease Assets and Liabilities (Details)
us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Foreign currency translation (loss) gain
us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax
China dissolution
Note 15 - Leases - Lease Cost (Details)
Cumulative translation adjustment
us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Note 15 - Leases - Minimum Future Lease Obligation (Details)
Note 17 - Business Segments - Operating Results for Business Segments (Details)
Note 17 - Business Segments - Total Business Segments Assets (Details)
Debt, current portion
Debt, Current, Total
Notes To Financial Statements
Notes To Financial Statements [Abstract]
us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
Diluted (in dollars per share)
Nonrecurring Adjustment [Axis]
Nonrecurring Adjustment [Domain]
Fair Value Adjustment to Inventory [Member]
Property and Equipment, Net [Member]
Represents property and equipment, net.
us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
Operating loss
Customer Relationship, Core Technology and Know-how [Member]
Represents information pertaining to customer relationship, core technology and know-how intangible assets.
us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net loss
Business Acquisition, Pro Forma Information [Table Text Block]
Grant [Member]
us-gaap_BusinessAcquisitionsProFormaRevenue
Revenues
Business Combination, Contingent Consideration, Liability, Measurement Input
Accounts payable and accrued expenses
Total
Deferred revenue, current portion
Goodwill and Intangible Assets Disclosure [Text Block]
Schedule of Goodwill [Table Text Block]
Accrued compensation
Income taxes payable
Lessee, Operating Leases [Text Block]
Accounts payable
Credit Facility [Axis]
Credit Facility [Domain]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Accrued other miscellaneous expenses
us-gaap_PolicyTextBlockAbstract
Accounting Policies
Trademarks and Trade Names [Member]
Trade Names [Member]
Accrued product warranty
Issuance of common stock in connection with the purchase of Neeltran, Inc.
Licensing Agreements [Member]
Indefinite-Lived Intangible Assets [Axis]
Indefinite-Lived Intangible Assets, Major Class Name [Domain]
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of property, plant and equipment
Non-cash investing and financing activities
us-gaap_WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation
Weighted-average shares subject to repurchase (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)
Cash paid for income taxes, net of refunds
Weighted-average shares of common stock outstanding (in shares)
Current liabilities:
Total assets
Total assets
Supplemental schedule of cash flow information:
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]
us-gaap_PaymentsToAcquireRealEstate
Payments to Acquire Real Estate, Total
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)
Customer Relationships [Member]
Deferred tax assets
Finite-Lived Intangible Assets by Major Class [Axis]
Share-Based Payment Arrangement [Text Block]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
Award Type [Domain]
us-gaap_EscrowDeposit
Escrow Deposit
Restricted cash
Award Type [Axis]
Net loss
Net loss
Net loss
us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Accumulated Amortization
Net Book Value
us-gaap_FiniteLivedIntangibleAssetsNet
Total
Intangible assets, net
Intangibles, net
Gross Amount
us-gaap_FiniteLivedIntangibleAssetsGross
Restricted Stock [Member]
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
Neeltran Acquisition
Trade name and trademarks
us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Business Combination Disclosure [Text Block]
Commitments and Contingencies Disclosure [Text Block]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
Property, plant and equipment, net
Goodwill
Goodwill
March 31, 2021
March 31, 2022
Northeast Power Systems, Inc (NEPSI) [Member]
Represents Northeast Power Systems, Inc (NEPSI).
amsc_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHighNumberOfShares
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High, Number of Shares (in shares)
For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid in shares.
Cash flows from investing activities:
Net loss per common share
Earnings Per Share [Text Block]
us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Accounts payable and accrued expenses
Letter of Credit [Member]
Income tax expense (benefit)
Income Tax Expense (Benefit), Total
amsc_CashCashEquivalentsAndMarketableSecurities
Cash, Cash Equivalents, and Marketable Securities
Represents the amount of currency on hand as well as demand deposits with banks or financial institutions, and marketable securities.
China dissolution
China dissolution
us-gaap_OperatingExpenses
Total operating expenses
Restricted cash
us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Restricted Cash and Cash Equivalents, Noncurrent, Total
us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalents, Current, Total
Cash and cash equivalents
Total stock-based compensation expense
Share-Based Payment Arrangement, Expense
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Change in fair value
Amendment Flag
us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive loss
City Area Code
us-gaap_IncreaseDecreaseInContractWithCustomerLiability
Deferred revenue
us-gaap_CommonStockSharesOutstanding
Balance (in shares)
Balance (in shares)
Current Fiscal Year End Date
Operating lease costs - variable
us-gaap_LeaseCost
Total lease costs
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses and other assets
Weighted-average discount rate
Document Fiscal Period Focus
Operating lease costs - fixed
Document Fiscal Year Focus
Short-term lease costs
Lease, Cost [Table Text Block]
Document Period End Date
Weighted-average remaining lease term (Year)
Entity File Number
Entity Emerging Growth Company
Document Type
Entity Small Business
Inox Wind Limited [Member]
Represents information pertaining to Inox Wind Limited.
Entity Shell Company
Document Information [Line Items]
Document Information [Table]
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Balance
Balance
Entity Filer Category
Debt Instrument [Axis]
Entity Current Reporting Status
Debt Instrument, Name [Domain]
us-gaap_BusinessCombinationAcquisitionRelatedCosts
Business Combination, Acquisition Related Costs
amsc_RevenuePerformanceObligationSatisfiedRevenueRecognizedPercentage
Revenue, Performance Obligation Satisfied, Revenue Recognized, Percentage
Represents the percentage of revenue recognized at the point of time when control transferred to the customer.
amsc_ExtendedServiceWarrantyTerm
Extended Service Warranty, Term (Year)
Represents the additional term of extended service-type warranties.
amsc_WarrantyPeriod
Warranty Period (Year)
Represents the typical term of assurance-type warranties on all product sales.
Less impairment loss
us-gaap_IncreaseDecreaseInAccountsReceivable
Accounts receivable
Stock-based compensation expense
Inox Wind Limited
Statement of Comprehensive Income [Abstract]
Entity Tax Identification Number
Entity Central Index Key
amsc_ContractWithCustomerPaymentTerm
Contract with Customer, Payment Term (Day)
Represents the payment term, from the date of delivery, under contracts with customers.
Depreciation and amortization
Entity Registrant Name
Liability Class [Axis]
Fair Value by Liability Class [Domain]
Entity [Domain]
Legal Entity [Axis]
Customer Concentration Risk [Member]
Entity Address, Address Line One
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Grid [Member]
Represents information pertaining to the Grid segment.
us-gaap_AmortizationOfIntangibleAssets
Amortization of Intangible Assets
us-gaap_TreasuryStockValueAcquiredCostMethod
Repurchase of treasury stock
Services and Technology Development [Member]
Represents information pertaining to services and technology development.
Entity Address, City or Town
Equipment and Systems [Member]
Represents information pertaining to equipment and systems.
Amortization of acquisition-related intangibles
Entity Address, Postal Zip Code
Entity Address, State or Province
Deferred program costs
Amount after valuation and LIFO reserves, and progress payments, of inventory associated with long-term contracts, expected to be sold, or consumed within one year or operating cycle, if longer.
Concentration Risk Type [Axis]
Wind [Member]
Represents information pertaining to the Wind segment.
us-gaap_TreasuryStockValue
Treasury stock
Concentration Risk Type [Domain]
Entity Common Stock, Shares Outstanding
Revenue Benchmark [Member]
us-gaap_IncreaseDecreaseInInventories
Inventory
Trading Symbol
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Issuance of common stock - Neeltran acquisition (in shares)
amsc_ContractWithCustomerAssetDeferredProgramCostsNet
Deferred Program Costs, beginning balance
Deferred Program Costs, ending balance
Represents the net deferred program costs related to contract with customer.
amsc_ContractWithCustomerAssetUnbilledARNet
Unbilled AR, beginning balance
Unbilled AR, ending balance
Represents the net unbilled AR related to contract with customer.
Deferred Program Costs, increases for costs incurred to fulfill performance obligations
Represents the change in contract costs attributable to deferred program costs related to contract with customer.
Issuance of common stock - ESPP (in shares)
us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan
Issuance of stock for 401(k) match
Local Phone Number
Issuance of stock for 401(k) match (in shares)
Issuance of common stock - Neeltran acquisition
Unbilled AR, increase (decrease) due to recognition of revenue based on transfer of control of performance obligations
Represents the change in the asset from the contract with customer from revenue recognized on unbilled accounts receivable.
us-gaap_TableTextBlock
Notes Tables
Capanna, Sr. and Capanna, Jr. [Member]
Represents Capanna, Sr. and Capanna, Jr.
Deferred Program Costs, decrease due to cost recognition on completed performance obligations
Represents the amount of contract costs recognized from deferred program costs, with regard to asset from contract with customer.
Neeltran Inc. Sellling Stockholders [Member]
Represents the selling stockholders of Neeltran Inc.
Unbilled AR, increase (decrease) due to customer billings
Represents the revenue recognized from performance obligation satisfied from change in time frame of unbilled AR related to contract with customer.
Indebtedness Secured by Mortgage on Real Property [Member]
Represents the indebtedness secured by the mortgage on the real property.
Issuance of common stock - ESPP
amsc_RestructuringAndRelatedCostExpectedAnnualSavings
Restructuring and Related Cost, Expected Annual Savings
The amount of expected annual savings due to restructuring program.
Other changes and FX impact
Represents other changes in the liability from contract with customer.
amsc_ContractWithCustomerLossAccrual
Contract With Customer Loss Accrual
The increase in loss accrual costs from contract with customer.
Deferred Program Costs, other changes and FX impact
Represents the change in the asset from contract with customer, attributable to other changes in deferred program costs.
Issuance of common stock - restricted shares, net of forfeited shares (in shares)
Issuance of common stock - restricted shares, net of forfeited shares
us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares)
amsc_ContractWithCustomerAssetDeferredProgramCostsIncreaseForBalancesAcquired
Increase for balance acquired
Amount of increase in deferred program costs from balances acquired.
Selling, general and administrative
us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Issuance of common stock - bonus payout
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)
Finance Lease, Right-of-use [Member]
Represents the right-of-use asset from finance lease.
Raw materials
Restricted Stock Issued in-Lieu of Cash Bonuses [Member]
Represents the restricted stock issued in-lieu of cash bonuses.
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders' equity
Finished goods
Work-in-process
Reported Value Measurement [Member]
amsc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetTangibleAssetsLiabilitis
Net tangible assets/(liabilities)
Amount recognized as of the acquisition date for the net tangible assets (liabilities).
Accumulated deficit
Retained Earnings (Accumulated Deficit), Total
Shares Tied to Derivative Liability [Member]
Represents the shares tied to the derivative liability.
Research and development
Thereafter
amsc_FinitelivedIntangibleAssetExpectedAmortizationAfterYearFour
Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).
Accumulated other comprehensive income (loss)
Backlog [Member]
Represents the information pertaining to backlog.
amsc_IntangibleAssetsMeasurementInput
Intangible Assets, Measurement Input (Rate)
Value of input used to measure intangible assets.
Royalty Rate [Member]
Represents the royalty rate.
Measurement Input, Discount Rate [Member]
Net working capital (excluding inventory and deferred revenue)
amsc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetWorkingCapital
Net working capital (excluding inventory and deferred revenue)
Amount of net working capital recognized as of the acquisition date.
Measurement Input, Share Price [Member]
Debt Disclosure [Text Block]
Changes in operating asset and liability accounts:
Measurement Input, Revenue Risk Premium [Member]
Measurement input using revenue risk premium.
Measurement Input, Revenue Volatility [Member]
Measurement input using revenue volatility.
Measurement Input, Payment Delay [Member]
Measurement input using payment delay.
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
us-gaap_OtherNoncashIncomeExpense
Other non-cash items
Inventory Disclosure [Text Block]
Lease liabilities - LT Operating
Measurement Input, Expected Term [Member]
Schedule of Inventory, Current [Table Text Block]
Present value of lease liabilities
Lease liabilities - ST Operating
us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Unrealized foreign exchange loss on cash and cash equivalents
Lease liabilities - ST Financing
Intangible assets, gross amount
us-gaap_IntangibleAssetsGrossExcludingGoodwill
Lease liabilities - LT Financing
Subsequent Events [Text Block]
Right-of-use assets
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total minimum lease payments
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Less: interest
Deferred income taxes
Measurement Input Type [Axis]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
2025
Measurement Input Type [Domain]
2023
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
2026
Right-of-use assets - Financing
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive
2027
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
Thereafter
2025
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2026
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Neeltran Inc. [Member]
Information related to Neeltran and International.
2027
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
2023
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
2024
Business Combination, Contingent Consideration [Text Block]
The entire disclosure for contingent consideration for business combination.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
2024
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
amsc_OperatingAndFinanceLeaseRightofuseAsset
Total right-of-use assets
Amount of lessee's right to use underlying asset under both operating and finance lease.
Neeltran Third Party Lenders [Member]
Information related to Neeltran third-party lenders.
AMSC Husky LLC [Member]
Information related to AMSC Husky LLC.
Owners of Neeltran Headquarters [Member]
Information related to the owners of the Neeltran headquarters building.
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Other assets
us-gaap_ShareBasedCompensation
Stock-based compensation expense
Issuance of common stock to settle liabilities
Estimated Useful Life (Year)
us-gaap_FiniteLivedIntangibleAssetUsefulLife
Finite-Lived Intangible Asset, Useful Life (Year)
Non-cash interest income
amsc_BusinessCombinationNumberOfEquipmentFinancingAgreementAssumed
Business Combination, Number of Equipment Financing Agreement Assumed
Represents number of equipment financing agreement assumed for business combination.
Equipment Financing Agreements Assumed In Business Acquisition [Member]
Represents equipment financing agreements assumed in business acquisition.
us-gaap_Revenues
Revenues, Total
Operating expenses:
Schedule of Finite-Lived Intangible Assets [Table Text Block]
us-gaap_LesseeOperatingLeaseRenewalTerm
Lessee, Operating Lease, Renewal Term (Year)
Accounts Receivable [Text Block]
The entire disclosure for accounts receivable.
us-gaap_DepreciationDepletionAndAmortization
Depreciation, Depletion and Amortization, Total
us-gaap_SharesIssuedPricePerShare
Shares Issued, Price Per Share (in dollars per share)
us-gaap_AssetsCurrent
Total current assets
Cash equivalents
us-gaap_LesseeFinanceLeaseTermOfContract1
Lessee, Finance Lease, Term of Contract (Month)
Change in fair value of contingent consideration
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability
Interest income, net
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Common stock
amsc_SupplyCommitmentDefaultLettersOfCreditToBeReceived
Supply Commitment, Default, Letters of Credit to be Received
The amount of letters of credit to be received for goods and services to be continued under the supply commitment.
Adjustments to reconcile net loss to net cash used in operations:
Measurement Frequency [Axis]
Measurement Frequency [Domain]
Fair Value, Recurring [Member]
Americas [Member]
us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Par or Stated Value Per Share (in dollars per share)
us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount
Asia Pacific [Member]
Statistical Measurement [Domain]
Maximum [Member]
Minimum [Member]
Product and Service [Axis]
Product and Service [Domain]
Statistical Measurement [Axis]
us-gaap_PaymentsToSuppliers
Payments to Suppliers
Property, Plant and Equipment Disclosure [Text Block]
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Geographical [Axis]
Property, Plant and Equipment [Table Text Block]
Geographical [Domain]
Inventory, net
Net inventory
Portion at Fair Value Measurement [Member] [Default]
Accrued inventories in-transit
Represents the amount of accrued inventories in transit, as of the balance sheet date.
Equipment and Software [Member]
Represents information pertaining to equipment and software.
Assets And Liabilities Lessee [Table Text Block]
Tabular disclosure of lessee's assets and liabilities.
EMEA [Member]
Revenues
Measurement Basis [Axis]
Fair Value, Inputs, Level 3 [Member]
Fair Value Hierarchy and NAV [Domain]
Customer [Axis]
Fair Value, Inputs, Level 1 [Member]
Customer [Domain]
Fair Value, Inputs, Level 2 [Member]
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
Fair Value Hierarchy and NAV [Axis]
us-gaap_ProductWarrantyAccrualPayments
Settlements during the period
Acquired warranty obligations
Change in accruals for warranties during the period
Construction in Progress [Member]
Cash flows from operating activities:
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Statement [Line Items]
us-gaap_NumberOfOperatingSegments
Number of Operating Segments
Accounts receivable, net
Accounts receivable, net
Furniture and Fixtures [Member]
us-gaap_NumberOfReportableSegments
Number of Reportable Segments
Building [Member]
Additional paid-in capital
AOCI Attributable to Parent [Member]
Schedule of Product Warranty Liability [Table Text Block]
Stockholders' equity:
Land [Member]
Leasehold Improvements [Member]
Other income (expense), net
Long-Lived Tangible Asset [Axis]
Segment Reporting Disclosure [Text Block]
Long-Lived Tangible Asset [Domain]
Current assets:
Fair Value Disclosures [Text Block]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash, cash equivalents and restricted cash at beginning of period
Cash, cash equivalents and restricted cash at end of period
Effect of exchange rate changes on cash
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net decrease in cash, cash equivalents and restricted cash
us-gaap_Liabilities
Total liabilities
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by financing activities
Commitments and Contingencies (Note 16)
Increase (decrease) due to customer billings
us-gaap_OperatingIncomeLoss
Operating loss
Operating Income (loss)
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net Cash Provided by (Used in) Operating Activities, Total
Net cash used in operating activities
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations
Increase for balance acquired
Prepaid expenses and other current assets
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash used in investing activities
Cost of revenues
Cost of Revenue, Total
us-gaap_GrossProfit
Gross margin
Counterparty Name [Axis]
Counterparty Name [Domain]
Consolidation Items [Domain]
Deferred tax liabilities
Provision for excess and obsolete inventory
Inventory Write-down
us-gaap_ContractWithCustomerLiability
Contract Liabilities, beginning balance
Contract Liabilities, ending balance
Consolidation Items [Axis]
us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Repurchase of treasury stock
us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets
Deferred Tax Liabilities, Other Finite-Lived Assets
us-gaap_ProductWarrantyAccrual
Balance at beginning of period
Balance at end of period
Accounts receivable (billed)
Accounts Receivable [Table Text Block]
Tabular disclosure of accounts receivable.
Retained Earnings [Member]
Treasury Stock [Member]
Proceeds from exercise of employee stock options and ESPP
Additional Paid-in Capital [Member]
Common Stock [Member]
Equity Components [Axis]
Equity Component [Domain]
us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)
us-gaap_RevenueRemainingPerformanceObligation
Revenue, Remaining Performance Obligation, Amount
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Loss before income tax expense
amsc_BusinessAcquisitionWeightedAverageNumberOfSharesOutstandingDiluted
Shares - diluted (in shares)
The pro forma weighted average number of shares outstanding diluted for the period as if the business combination or combinations had been completed at the beginning of a period.
Other comprehensive (loss) gain, net of tax:
amsc_BusinessAcquisitionWeightedAverageNumberOfSharesOutstandingBasic
Shares - basic (in shares)
The pro forma weighted average number of shares outstanding basic for the period as if the business combination or combinations had been completed at the beginning of a period.
Disaggregation of Revenue [Table Text Block]
us-gaap_RepaymentsOfLongTermDebt
Repayment of debt
Revenue from Contract with Customer [Text Block]
Immediately Vested Common Stock Issued in Lieu of Cash Bonuses [Member]
Represents immediately vested common stock issued un lieu of cash bonuses.
Total lease liabilities
Present value of lessee's discounted obligation for lease payments from operating and finance leases.
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Document Quarterly Report
Entity Incorporation, State or Country Code
us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits, Ending Balance
Accounting Policies [Abstract]
Lease liability, current portion
The amount of lease liability of both operating and financing leases, classified as current.
Document Transition Report
Lease liability, long-term portion
amsc_LeaseLiabilityNoncurrent
The amount of lease liability of both operating and financing leases, classified as noncurrent.
Selling, General and Administrative Expenses [Member]
Entity Interactive Data Current
Security Exchange Name
Title of 12(b) Security
Cost of Sales [Member]
Research and Development Expense [Member]
Income Statement Location [Axis]
Income Statement Location [Domain]
Advanced deposits
Fuji Bridex Pte Ltd [Member]
Related to Fuji Bridex Pte Ltd.
Segments [Axis]
Segments [Domain]
us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization
Finance Lease, Right-of-Use Asset, Accumulated Amortization
us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)
Diluted (in shares)
Shares used in per-share calculation ? diluted (in shares)
Accounts receivable (unbilled)
Statement [Table]
Core Technology and Know-how [Member]
Represents information pertaining to Core Technology and Know-how.
Statement of Financial Position [Abstract]
Diluted (in dollars per share)
Net loss per share ? diluted (in dollars per share)
Basic (in shares)
Shares used in per-share calculation ? basic (in shares)
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
Business Acquisition [Axis]
Basic (in dollars per share)
Net loss per share ? basic (in dollars per share)
Business Acquisition, Acquiree [Domain]
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Weighted average number of common shares outstanding
Statement of Cash Flows [Abstract]
Statement of Stockholders' Equity [Abstract]
Income Statement [Abstract]
us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Total other comprehensive (loss) gain, net of tax
Fair value (millions)
Business Combination, Contingent Consideration, Liability, Total
amsc_ExtendedWarrantyTriggerPeriod
Extended Warranty Trigger Period (Year)
The period in which customers may extend their warranty for an additional term.
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent
Issuance of common stock, shares (in shares)
us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)
us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInventory
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory
Immediately Vested Common Stock [Member]
Represents common stock which is vested immediately upon issuance.
Accounting Standards Update and Change in Accounting Principle [Text Block]
us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Change in other assets
Cash flows from financing activities:
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Other liabilities
Corporate, Non-Segment [Member]
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Total purchase consideration
Deferred revenue, long-term portion
us-gaap_StockholdersEquity
Total stockholders' equity
Balance
Balance
us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Property, plant and equipment, net
us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization
Less accumulated depreciation
Supplier [Axis]
Class of Stock [Axis]
Supplier [Domain]
Deferred tax liability
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities
Debt, long-term portion
Long-term Debt, Excluding Current Maturities, Total
Property, plant and equipment, gross
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue
Deferred revenue
Cash or Debt payment
us-gaap_PaymentsToAcquireBusinessesGross
Payments to Acquire Businesses, Gross
Cash paid for acquisition, net of cash acquired
Operating Segments [Member]
Derivative Financial Instruments, Liabilities [Member]
Property, plant and equipment
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment