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CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
REVENUE:      
Material sales $ 126,885us-gaap_SalesRevenueGoodsNet $ 95,713us-gaap_SalesRevenueGoodsNet $ 44,472us-gaap_SalesRevenueGoodsNet
Royalty and license fees 63,192us-gaap_RoyaltyRevenue 47,006us-gaap_RoyaltyRevenue 31,698us-gaap_RoyaltyRevenue
Technology development and support revenue 954us-gaap_TechnologyServicesRevenue 3,920us-gaap_TechnologyServicesRevenue 7,074us-gaap_TechnologyServicesRevenue
Total revenue 191,031us-gaap_Revenues 146,639us-gaap_Revenues 83,244us-gaap_Revenues
OPERATING EXPENSES:      
Cost of material sales 41,315us-gaap_CostOfGoodsSold 28,889us-gaap_CostOfGoodsSold 4,528us-gaap_CostOfGoodsSold
Research and development 41,154us-gaap_ResearchAndDevelopmentExpense 34,215us-gaap_ResearchAndDevelopmentExpense 30,032us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 28,135us-gaap_SellingGeneralAndAdministrativeExpense 24,745us-gaap_SellingGeneralAndAdministrativeExpense 19,550us-gaap_SellingGeneralAndAdministrativeExpense
Patent costs and amortization of acquired technology 17,288us-gaap_LicenseCosts 17,273us-gaap_LicenseCosts 13,385us-gaap_LicenseCosts
Royalty and license expense 4,519us-gaap_RoyaltyExpense 3,273us-gaap_RoyaltyExpense 2,073us-gaap_RoyaltyExpense
Total operating expenses 132,411us-gaap_OperatingExpenses 108,395us-gaap_OperatingExpenses 69,568us-gaap_OperatingExpenses
Operating income 58,620us-gaap_OperatingIncomeLoss 38,244us-gaap_OperatingIncomeLoss 13,676us-gaap_OperatingIncomeLoss
INTEREST INCOME 777us-gaap_InvestmentIncomeInterest 811us-gaap_InvestmentIncomeInterest 1,240us-gaap_InvestmentIncomeInterest
INTEREST EXPENSE (70)us-gaap_InterestExpense (47)us-gaap_InterestExpense (48)us-gaap_InterestExpense
INCOME BEFORE INCOME TAXES 59,327us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 39,008us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 14,868us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
INCOME TAX (EXPENSE) BENEFIT (17,473)us-gaap_IncomeTaxExpenseBenefit 35,044us-gaap_IncomeTaxExpenseBenefit (5,208)us-gaap_IncomeTaxExpenseBenefit
NET INCOME $ 41,854us-gaap_NetIncomeLoss $ 74,052us-gaap_NetIncomeLoss $ 9,660us-gaap_NetIncomeLoss
NET INCOME PER COMMON SHARE:      
BASIC (in dollars per share) $ 0.90us-gaap_EarningsPerShareBasic $ 1.61us-gaap_EarningsPerShareBasic $ 0.21us-gaap_EarningsPerShareBasic
DILUTED (in dollars per share) $ 0.90us-gaap_EarningsPerShareDiluted $ 1.59us-gaap_EarningsPerShareDiluted $ 0.21us-gaap_EarningsPerShareDiluted
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE:      
BASIC (in shares) 46,252,960us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 45,898,019us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 45,951,276us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
DILUTED (in shares) 46,685,145us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 46,543,605us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 46,883,602us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding