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Intangible Assets (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Additional disclosures      
Amortization expense $ 57,000us-gaap_AmortizationOfIntangibleAssets $ 57,000us-gaap_AmortizationOfIntangibleAssets  
Estimated annual aggregate amortization expense through December 31, 2015 229,000supn_FiniteLivedIntangibleAssetsEstimatedAnnualAggregateAmortizationExpense    
Net book value of intangible assets 7,839,000us-gaap_IntangibleAssetsNetExcludingGoodwill   5,434,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Purchased Patents      
Finite lived intangible assets disclosures      
Weighted-Average Life 10 years   10 years
Gross Carrying Amount 2,292,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
  2,292,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Accumulated Amortization 2,125,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
  2,067,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Oxtellar XR      
Finite lived intangible assets disclosures      
Number of U.S. patents issued 4supn_NumberOfPatentsIssued
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= supn_OxtellarXRMember
   
Trokendi XR      
Finite lived intangible assets disclosures      
Number of U.S. patents issued 6supn_NumberOfPatentsIssued
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= supn_TrokendiXrMember
   
Deferred Legal Fees      
Finite lived intangible assets disclosures      
Gross Carrying Amount $ 7,672,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= supn_PatentDefenseCostsMember
  $ 5,209,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= supn_PatentDefenseCostsMember