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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
REVENUE:        
Material sales $ 35,926 $ 27,137 $ 71,252 $ 39,889
Royalty and license fees 28,064 21,201 29,843 22,500
Technology development and support revenue 137 1,021 870 1,946
Total revenue 64,127 49,359 101,965 64,335
OPERATING EXPENSES:        
Cost of material sales 11,951 8,282 21,848 11,374
Research and development 10,544 7,316 20,700 16,254
Selling, general and administrative 6,545 6,336 12,975 11,507
Patent costs and amortization of acquired technology 4,748 4,522 8,721 9,139
Royalty and license expense 1,501 1,172 2,257 1,484
Total operating expenses 35,289 27,628 66,501 49,758
Operating income 28,838 21,731 35,464 14,577
INTEREST INCOME 193 178 411 388
INTEREST EXPENSE (21) (10) (37) (18)
INCOME BEFORE INCOME TAXES 29,010 21,899 35,838 14,947
INCOME TAX EXPENSE (8,588) (6,517) (11,395) (4,323)
NET INCOME $ 20,422 $ 15,382 $ 24,443 $ 10,624
NET INCOME PER COMMON SHARE:        
Basic (in dollars per share) $ 0.44 $ 0.34 $ 0.53 $ 0.23
Diluted (in dollars per share) $ 0.44 $ 0.33 $ 0.52 $ 0.23
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE:        
Weighted average common shares outstanding - Basic (in shares) 46,266,142 45,859,286 46,222,146 45,841,446
Weighted average common shares outstanding - Diluted (in shares) 46,614,726 46,496,120 46,632,982 46,523,540