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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue:    
Royalties $ 66,963us-gaap_RoyaltyRevenue $ 73,637us-gaap_RoyaltyRevenue
Contract and other revenue 5,951us-gaap_ContractsRevenue 4,651us-gaap_ContractsRevenue
Total revenue 72,914us-gaap_SalesRevenueNet 78,288us-gaap_SalesRevenueNet
Operating costs and expenses:    
Cost of revenue 10,756us-gaap_CostOfRevenue [1] 10,022us-gaap_CostOfRevenue [1]
Research and development 28,534us-gaap_ResearchAndDevelopmentExpense [1] 26,898us-gaap_ResearchAndDevelopmentExpense [1]
Sales, general and administrative 18,502us-gaap_SellingGeneralAndAdministrativeExpense [1] 18,820us-gaap_SellingGeneralAndAdministrativeExpense [1]
Gain from sale of intellectual property (2,260)us-gaap_GainLossOnDispositionOfIntangibleAssets (170)us-gaap_GainLossOnDispositionOfIntangibleAssets
Restructuring charges 0us-gaap_RestructuringCharges 39us-gaap_RestructuringCharges
Gain from settlement (510)us-gaap_GainLossRelatedToLitigationSettlement (510)us-gaap_GainLossRelatedToLitigationSettlement
Total operating costs and expenses 55,022us-gaap_CostsAndExpenses 55,099us-gaap_CostsAndExpenses
Operating income (loss) 17,892us-gaap_OperatingIncomeLoss 23,189us-gaap_OperatingIncomeLoss
Interest income and other income (expense), net 132us-gaap_OtherNonoperatingIncome 13us-gaap_OtherNonoperatingIncome
Interest expense (3,083)us-gaap_InterestExpense (9,926)us-gaap_InterestExpense
Interest and other income (expense), net (2,951)us-gaap_NonoperatingIncomeExpense (9,913)us-gaap_NonoperatingIncomeExpense
Income before income taxes 14,941us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 13,276us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes 5,439us-gaap_IncomeTaxExpenseBenefit 5,472us-gaap_IncomeTaxExpenseBenefit
Net Income (Loss) $ 9,502us-gaap_NetIncomeLoss $ 7,804us-gaap_NetIncomeLoss
Net income per share:    
Earnings Per Share, Basic $ 0.08us-gaap_EarningsPerShareBasic $ 0.07us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted $ 0.08us-gaap_EarningsPerShareDiluted $ 0.07us-gaap_EarningsPerShareDiluted
Weighted average shares used in per share calculation:    
Basic (in shares) 115,336us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 113,590us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 117,442us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 116,629us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
[1] Includes stock-based compensation