XML 63 R51.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Debt - Additional Information (Detail) - USD ($) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 19, 2014 | Jun. 30, 2017 | Jun. 30, 2016 | Mar. 17, 2017 | Mar. 16, 2017
FIrst Warrants | Senior secured loan | Hercules Technology Growth Capital |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of shares received from warrants received to purchase common stock (in shares) | 13,927 |  |  |  |
Fair value of warrants issued | $ 400,000 |  |  |  |
Second Warrants | Senior secured loan | Hercules Technology Growth Capital |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of shares received from warrants received to purchase common stock (in shares) | 25,641 |  |  |  |
Fair value of warrants issued | $ 200,000 |  |  |  |
Hercules Warrants | Senior secured loan | Hercules Technology Growth Capital |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of shares received from warrants received to purchase common stock (in shares) | 58,823 |  |  |  |
Warrant exercise price (in dollars per share) | $ 11.00 | $ 8.02 |  |  |
Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense, debt (less than $0.1 million in three months 2017) |  |  | $ 200,000 |  |
Term Loan | Senior secured loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense, debt (less than $0.1 million in three months 2017) |  | $ 100,000 |  |  |
Term Loan B | Senior secured loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Non-cash interest expense amortization of debt discount (less than $0.1 million each for Term Loan B and Term Loan C) |  |  | 100,000 |  |
Term Loan B | Hercules Warrants | Senior secured loan | Hercules Technology Growth Capital |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Non-cash interest expense amortization of debt discount (less than $0.1 million each for Term Loan B and Term Loan C) |  |  | 100,000 |  |
Term Loan C | Senior secured loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Non-cash interest expense amortization of debt discount (less than $0.1 million each for Term Loan B and Term Loan C) |  | $ 100,000 | 100,000 |  |
Term Loan C | Senior secured loan | Hercules Technology Growth Capital |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, face amount | $ 1,500,000.0 |  |  |  |
Net proceeds from debt | 1,400,000 |  |  |  |
Interest rate, stated percentage |  |  |  | 11.25% | 11.00%
Debt instrument, maturity date |  | Jun. 01, 2017 |  |  |
Term Loan C | Hercules Warrants | Senior secured loan | Hercules Technology Growth Capital |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized discount (premium) and debt issuance costs | $ 300,000 |  |  |  |
Non-cash interest expense amortization of debt discount (less than $0.1 million each for Term Loan B and Term Loan C) |  | $ 100,000 | $ 100,000 |  |

X
- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_AmortizationOfDebtDiscountPremium
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_InterestExpenseDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
Name: | us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Value of preferred stock and warrants for common stock issued. + References No definition available. + Details
Name: | us-gaap_StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=amsc_FIrstWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=amsc_HerculesTechnologyGrowthCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=amsc_SecondWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=amsc_HerculesWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=amsc_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=amsc_TermLoanBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=amsc_TermLoanCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |