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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
REVENUE:      
Material sales $ 200,259 $ 99,285 $ 113,066
Royalty and license fees 126,503 96,132 77,773
Contract research services 8,867 3,469 207
Total revenue 335,629 198,886 191,046
COST OF SALES 54,698 26,288 62,997
Gross margin 280,931 172,598 128,049
OPERATING EXPENSES:      
Research and development 49,144 42,744 44,641
Selling, general and administrative 46,808 32,876 29,046
Amortization of acquired technology and other intangible assets 21,983 16,493 10,999
Patent costs 7,010 6,249 5,717
Royalty and license expenses 9,739 5,823 5,370
Total operating expenses 134,684 104,185 95,773
OPERATING INCOME 146,247 68,413 32,276
Interest income, net 3,294 2,113 783
Other expense, net (4) (1,928)  
Interest and other expense, net 3,290 185 783
INCOME BEFORE INCOME TAXES 149,537 68,598 33,059
INCOME TAX EXPENSE (45,652) (20,528) (18,381)
NET INCOME $ 103,885 $ 48,070 $ 14,678
NET INCOME PER COMMON SHARE:      
BASIC $ 2.19 $ 1.02 $ 0.31
DILUTED $ 2.18 $ 1.02 $ 0.31
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE:      
BASIC 46,725,289 46,408,460 46,816,394
DILUTED 46,805,194 46,535,980 47,494,188
CASH DIVIDEND DECLARED PER COMMON SHARE $ 0.12