CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
REVENUE:
Material sales	$ 26,818us-gaap_SalesRevenueGoodsNet	$ 35,327us-gaap_SalesRevenueGoodsNet
Royalty and license fees	4,375us-gaap_RoyaltyRevenue	1,779us-gaap_RoyaltyRevenue
Technology development and support revenue	30us-gaap_TechnologyServicesRevenue	733us-gaap_TechnologyServicesRevenue
Total revenue	31,223us-gaap_Revenues	37,839us-gaap_Revenues
OPERATING EXPENSES:
Cost of material sales	8,581us-gaap_CostOfGoodsSold	9,897us-gaap_CostOfGoodsSold
Research and development	9,919us-gaap_ResearchAndDevelopmentExpense	10,156us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative	6,200	6,430
Patent costs and amortization of acquired technology	3,967us-gaap_LicenseCosts	3,972us-gaap_LicenseCosts
Royalty and license expense	785us-gaap_RoyaltyExpense	756us-gaap_RoyaltyExpense
Total operating expenses	29,452us-gaap_OperatingExpenses	31,211us-gaap_OperatingExpenses
Operating (loss) income	1,771us-gaap_OperatingIncomeLoss	6,628us-gaap_OperatingIncomeLoss
INTEREST INCOME	173us-gaap_InvestmentIncomeInterest	218us-gaap_InvestmentIncomeInterest
INTEREST EXPENSE	(12)us-gaap_InterestExpense	(17)us-gaap_InterestExpense
INCOME BEFORE INCOME TAXES	1,932	6,829
INCOME TAX EXPENSE	(618)us-gaap_IncomeTaxExpenseBenefit	(2,807)us-gaap_IncomeTaxExpenseBenefit
NET INCOME	$ 1,314us-gaap_NetIncomeLoss	$ 4,022us-gaap_NetIncomeLoss
NET INCOME PER COMMON SHARE:
Basic (in dollars per share)	$ 0.03us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.03us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE:
Weighted average common shares outstanding - Basic (in shares)	45,785,725	46,177,661
Weighted average common shares outstanding - Diluted (in shares)	46,214,247	46,651,438

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