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Warrants and Derivative Liabilities - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 3 Months Ended
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Mar. 24, 2015 | Nov. 13, 2014 | Nov. 15, 2013 | Jun. 05, 2012 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2014 | Oct. 09, 2013 | Apr. 04, 2012 | Mar. 02, 2014 | Dec. 31, 2012 | Dec. 19, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase one share of common stock |  | 90.00%amsc_WarrantsToPurchaseOneShareOfCommonStock |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split | 0.1 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 | 0.1 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants |  |  |  |  | $ 3,963 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants | $ 1,872 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants | $ 7,556 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants |  |  |  |  |  |  |
Convertible debt instrument redemption waiting period |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |
Convertible debt instrument contractual term |  |  |  |  | 30 months |  |  |  |  |  |  |  |  |
Warrants expiration date |  |  | May 15, 2019 | Dec. 05, 2017 |  |  |  |  |  |  |  |  |  |
Common stock units offered |  | 909,090 us-gaap_CommonUnitIssued |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued to purchase common stock |  | 818,181 amsc_NumberOfWarrantsIssuedToPurchaseCommonStock |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share |  | $ 11.00 us-gaap_SaleOfStockPricePerShare |  |  |  |  |  |  |  |  |  |  |  |
Convertible Bond |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants |  |  |  |  |  | 500 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_ConvertibleBondMember | 3,800 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_ConvertibleBondMember |  |  |  |  |  |  |
Senior Secured Term Loan First Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants |  |  |  |  | 100 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_SeniorSecuredTermLoanFirstWarrantMember | 100 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_SeniorSecuredTermLoanFirstWarrantMember | 200 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_SeniorSecuredTermLoanFirstWarrantMember |  |  |  |  |  |  |
Hudson Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants |  |  |  |  | 1,800 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_ClassOfWarrantOrRightAxis = amsc_HudsonWarrantMember |  |  |  |  |  |  |  |  |
Capital Ventures International |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise, waiting period |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |
Warrant exercise period |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  | 909,090 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember |  |  |  |  |  |
Required notification period |  |  |  |  | 61 days |  |  |  |  |  |  |  |  |
Warrants to purchase one share of common stock |  |  |  |  |  |  |  | 90.00%amsc_WarrantsToPurchaseOneShareOfCommonStock / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember |  |  |  |  |  |
Reverse stock split | 0.1 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants |  |  |  |  | 1,900 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember | 1,200 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember | 3,600 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember |  |  |  |  |  |  |
Senior Convertible Debt | Capital Ventures International |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock |  |  |  |  |  |  |  |  |  | 309,406 amsc_PurchaseCommitmentIssuanceOfWarrantsSharesOfCommonStock / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |
Exercise price |  |  |  |  |  |  |  | 22.10 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | $ 26.10 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | $ 54.50 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  |
New Unsecured Senior Convertible Note |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price |  |  |  |  |  |  |  |  |  | $ 48.50 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = amsc_NewUnsecuredSeniorConvertibleNoteMember |  | 31.90 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = amsc_NewUnsecuredSeniorConvertibleNoteMember |  |
Debt conversion, shares issued |  |  |  |  |  |  |  |  |  |  | 663,000 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_LongtermDebtTypeAxis = amsc_NewUnsecuredSeniorConvertibleNoteMember |  |  |
New Unsecured Senior Convertible Note | Capital Ventures International | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial ownership limitation percentage |  |  |  |  |  |  |  |  |  |  |  | 4.99%amsc_BeneficialOwnershipLimitationPercentage / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember / us-gaap_LongtermDebtTypeAxis = amsc_NewUnsecuredSeniorConvertibleNoteMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
New Unsecured Senior Convertible Note | Capital Ventures International | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial ownership limitation percentage |  |  |  |  |  |  |  |  |  |  |  | 9.99%amsc_BeneficialOwnershipLimitationPercentage / us-gaap_DebtInstrumentAxis = amsc_CapitalVenturesInternationalMember / us-gaap_LongtermDebtTypeAxis = amsc_NewUnsecuredSeniorConvertibleNoteMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Senior Secured Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock |  |  | 25,641 amsc_PurchaseCommitmentIssuanceOfWarrantsSharesOfCommonStock / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  |  |  |  |  |  |  |  |
Exercise price |  | $ 17.00 invest_InvestmentWarrantsExercisePrice / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember | 19.50 invest_InvestmentWarrantsExercisePrice / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  | 909,090 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants |  |  |  |  | $ 300 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 0 amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |
Senior Secured Loan | Hercules Technology Growth Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock |  |  |  | 13,927 amsc_PurchaseCommitmentIssuanceOfWarrantsSharesOfCommonStock / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  |  |  |  |  |  | 58,823 amsc_PurchaseCommitmentIssuanceOfWarrantsSharesOfCommonStock / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |
Exercise price |  |  |  | 35.90 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember | $ 17.00 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  |  |  |  |  | $ 11.00 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember | $ 19.50 invest_InvestmentWarrantsExercisePrice / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember
Common stock, shares issued |  | 909,090 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_DebtInstrumentAxis = amsc_HerculesTechnologyGrowthCapitalMember / us-gaap_LongtermDebtTypeAxis = amsc_SeniorSecuredLoanMember |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Number of warrants issued to purchase common stock. + References No definition available. + Details
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