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Fair Value Measurements - Schedule of Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Ending balance | $ 2,999 us-gaap_DerivativeLiabilitiesCurrent | $ 2,601 us-gaap_DerivativeLiabilitiesCurrent
Warrants |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning balance | 2,601 us-gaap_DerivativeLiabilitiesCurrent / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_WarrantMember | 3,633 us-gaap_DerivativeLiabilitiesCurrent / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_WarrantMember
Warrant issuance with equity offering | 4,255 amsc_FairValueDisclosureIssuanceOfWarrantsWithEquityOffering / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_WarrantMember |
Warrant issuance with senior secured term loan | 106 amsc_FairValueDisclosureIssuanceOfWarrantsWithSecuredTermLoan / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_WarrantMember | 315 amsc_FairValueDisclosureIssuanceOfWarrantsWithSecuredTermLoan / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_WarrantMember
Mark to market adjustment | (3,963)us-gaap_LiabilitiesFairValueAdjustment / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_WarrantMember | (1,347)us-gaap_LiabilitiesFairValueAdjustment / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_WarrantMember
Ending balance | 2,999 us-gaap_DerivativeLiabilitiesCurrent / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_WarrantMember | 2,601 us-gaap_DerivativeLiabilitiesCurrent / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_WarrantMember
Derivative Liability |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning balance |  | 529 us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Mark to market adjustment |  | (525)us-gaap_LiabilitiesFairValueAdjustment / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Extinguishment of derivative liability |  | $ (4)amsc_FairValueDisclosureExtinguishmentOfDerivativeLiability / us-gaap_FairValueByLiabilityClassAxis = us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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