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CONSLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
REVENUE:        
Material sales $ 27,137 $ 12,848 $ 39,889 $ 23,377
Royalty and license fees 21,201 15,435 22,500 15,857
Technology development and support revenue 1,021 1,704 1,946 3,373
Total revenue 49,359 29,987 64,335 42,607
OPERATING EXPENSES:        
Cost of material sales 8,282 1,611 11,374 2,699
Research and development 7,316 7,236 16,254 13,897
Selling, general and administrative 6,336 5,189 11,507 9,486
Patent costs and amortization of acquired technology 4,522 2,255 9,139 4,123
Royalty and license expense 1,172 786 1,484 1,036
Total operating expenses 27,628 17,077 49,758 31,241
Operating income 21,731 12,910 14,577 11,366
INTEREST INCOME 178 357 388 714
INTEREST EXPENSE (10) (18) (18) (38)
INCOME BEFORE INCOME TAX EXPENSE 21,899 13,249 14,947 12,042
INCOME TAX EXPENSE (6,517) (2,285) (4,323) (2,299)
NET INCOME $ 15,382 $ 10,964 $ 10,624 $ 9,743
NET INCOME PER COMMON SHARE:        
BASIC (in dollars per share) $ 0.34 $ 0.24 $ 0.23 $ 0.21
DILUTED (in dollars per share) $ 0.33 $ 0.23 $ 0.23 $ 0.21
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE:        
BASIC (in shares) 45,859,286 45,953,312 45,841,446 45,871,166
DILUTED (in shares) 46,496,120 46,857,309 46,523,540 46,896,898