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Convertible Senior Secured Notes (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Details of Notes reflected in balance sheet      
Carrying value $ 11,708us-gaap_ConvertibleLongTermNotesPayable   $ 26,947us-gaap_ConvertibleLongTermNotesPayable
Loss on extinguishment of debt 2,134us-gaap_GainsLossesOnExtinguishmentOfDebt 1,693us-gaap_GainsLossesOnExtinguishmentOfDebt  
7.50% Convertible Senior Secured Notes due 2019      
Details of Notes reflected in balance sheet      
Gross proceeds     90,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Initial value of interest make-whole derivative reported as debt discount     (9,270)supn_FairValueOfInterestMakeWholeDerivative
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Conversion option reported as debt discount and APIC     (22,336)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Conversion of debt to equity - principal (21,407)us-gaap_DebtConversionOriginalDebtAmount1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
(9,500)us-gaap_DebtConversionOriginalDebtAmount1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
(53,941)us-gaap_DebtConversionOriginalDebtAmount1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Conversion of debt to equity - accretion of debt discount 5,826us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
  17,926us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Accretion of debt discount 342us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
  4,568us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Carrying value 11,708us-gaap_ConvertibleLongTermNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
  26,947us-gaap_ConvertibleLongTermNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Shares of common stock issued in conversion of Notes 4,000,000us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
   
Shares of common stock issued in settlement of the interest make-whole provision 400,000supn_DebtConversionConvertedInstrumentSharesIssuedInSettlementOfInterestMakeWholeProvision
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
   
Loss on extinguishment of debt $ 2,100us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
$ 1,700us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember