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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
REVENUE:      
Material sales $ 99,285 $ 113,066 $ 126,885
Royalty and license fees 96,132 77,773 63,192
Contract research services 3,469 207 954
Total revenue 198,886 191,046 191,031
COST OF SALES 26,288 62,997 41,315
Gross margin 172,598 128,049 149,716
OPERATING EXPENSES:      
Research and development 42,744 44,641 41,154
Selling, general and administrative 32,876 29,046 28,135
Amortization of acquired technology and other intangible assets 16,493 10,999 10,997
Patent costs 6,249 5,717 6,291
Royalty and license expenses 5,823 5,370 4,519
Total operating expenses 104,185 95,773 91,096
OPERATING INCOME 68,413 32,276 58,620
Interest income, net 2,113 783 707
Other (expense) income, net (1,928)    
Interest and other (expense) income, net 185 783 707
INCOME BEFORE INCOME TAXES 68,598 33,059 59,327
INCOME TAX EXPENSE (20,528) (18,381) (17,473)
NET INCOME $ 48,070 $ 14,678 $ 41,854
Net income per common share:      
Basic $ 1.02 $ 0.31 $ 0.90
Diluted $ 1.02 $ 0.31 $ 0.90
Weighted average shares used in computing net income per common share:      
Basic 46,408,460 46,816,394 46,252,960
Diluted 46,535,980 47,494,188 46,685,145