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Earnings per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Numerator, in thousands    
Net income (loss) used for calculation of basic and diluted EPS $ 917us-gaap_NetIncomeLoss $ (15,543)us-gaap_NetIncomeLoss
Denominator    
Weighted average shares outstanding, basic 44,563,299us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 41,129,055us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive potential common shares    
Stock options, stock appreciation rights, non-vested stock options, and ESPP awards 337,999supn_IncrementalCommonSharesAttributableToStockOptionsStockAppreciationRightsAndNonVestedStockOptionsAndEsppAward  
Total potential dilutive common shares 337,999us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment  
Weighted average shares outstanding, diluted 44,901,298us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 41,129,055us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (loss) per share, basic $ 0.02us-gaap_EarningsPerShareBasic $ (0.38)us-gaap_EarningsPerShareBasic
Net income (loss) per share, diluted $ 0.02us-gaap_EarningsPerShareDiluted $ (0.38)us-gaap_EarningsPerShareDiluted
7.50% Convertible Senior Secured Notes due 2019    
Loss Per Share    
Common stock equivalents excluded in the calculation of diluted loss per share 6,071,894us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleNotesPayableMember		 7,556,001us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleNotesPayableMember
Warrant to purchase common stock    
Loss Per Share    
Common stock equivalents excluded in the calculation of diluted loss per share 21,800us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= supn_WarrantToPurchaseCommonStockMember		 21,273us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= supn_WarrantToPurchaseCommonStockMember
Stock Options, Stock Appreciation Rights, Non-Vested Stock Options and ESPP Awards    
Loss Per Share    
Common stock equivalents excluded in the calculation of diluted loss per share   356,364us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= supn_StockOptionsStockAppreciationRightsNonVestedStockOptionsAndEsppAwardsMember