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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues:      
Net product sales $ 12,909us-gaap_SalesRevenueGoodsNet      
Royalty revenue 6,502us-gaap_RoyaltyRevenue 7,090us-gaap_RoyaltyRevenue 5,938us-gaap_RoyaltyRevenue
Licensing agreement 30,746us-gaap_LicensesRevenue 26,789us-gaap_LicensesRevenue 26,789us-gaap_LicensesRevenue
Total revenues 50,157us-gaap_Revenues 33,879us-gaap_Revenues 32,727us-gaap_Revenues
Operating expenses:      
Cost of goods sold 1,583us-gaap_CostOfGoodsSold   129us-gaap_CostOfGoodsSold
Research and development 19,230us-gaap_ResearchAndDevelopmentExpense 28,502us-gaap_ResearchAndDevelopmentExpense 45,764us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 84,644us-gaap_SellingGeneralAndAdministrativeExpense 25,082us-gaap_SellingGeneralAndAdministrativeExpense 14,517us-gaap_SellingGeneralAndAdministrativeExpense
Intangible asset amortization 2,254us-gaap_AmortizationOfIntangibleAssets 1,495us-gaap_AmortizationOfIntangibleAssets 1,495us-gaap_AmortizationOfIntangibleAssets
Gain on arbitration settlement (77,616)us-gaap_GainLossRelatedToLitigationSettlement    
Total operating expenses 30,095us-gaap_CostsAndExpenses 55,079us-gaap_CostsAndExpenses 61,905us-gaap_CostsAndExpenses
Income (loss) from operations 20,062us-gaap_OperatingIncomeLoss (21,200)us-gaap_OperatingIncomeLoss (29,178)us-gaap_OperatingIncomeLoss
Other income 124us-gaap_OtherIncome 145us-gaap_OtherIncome 561us-gaap_OtherIncome
Net income (loss) $ 20,186us-gaap_NetIncomeLoss $ (21,055)us-gaap_NetIncomeLoss $ (28,617)us-gaap_NetIncomeLoss
Net income (loss) per share:      
Basic $ 0.58us-gaap_EarningsPerShareBasic $ (0.69)us-gaap_EarningsPerShareBasic $ (1.01)us-gaap_EarningsPerShareBasic
Diluted $ 0.55us-gaap_EarningsPerShareDiluted $ (0.69)us-gaap_EarningsPerShareDiluted $ (1.01)us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:      
Basic 34,774,163us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 30,351,353us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 28,228,409us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 36,686,723us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 30,351,353us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 28,228,409us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding