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CONSLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
REVENUE:        
Material sales $ 30,286 $ 10,984 $ 70,175 $ 34,361
Royalty and license fees 1,456 396 23,956 16,253
Technology development and support revenue 1,084 1,124 3,030 4,497
Total revenue 32,826 12,504 97,161 55,111
OPERATING EXPENSES:        
Cost of material sales 9,783 1,094 21,157 3,793
Research and development 7,862 8,177 24,116 22,074
Selling, general and administrative 6,411 5,275 17,918 14,761
Patent costs and amortization of acquired technology 3,899 3,736 13,038 7,859
Royalty and license expense 624 283 2,108 1,319
Total operating expenses 28,579 18,565 78,337 49,806
Operating income (loss) 4,247 (6,061) 18,824 5,305
INTEREST INCOME 206 272 594 986
INTEREST EXPENSE (13) (5) (31) (43)
INCOME (LOSS) BEFORE INCOME TAXES 4,440 (5,794) 19,387 6,248
INCOME TAX BENEFIT (EXPENSE) 1,102 326 (3,221) (1,973)
NET INCOME (LOSS) $ 5,542 $ (5,468) $ 16,166 $ 4,275
NET INCOME (LOSS) PER COMMON SHARE:        
BASIC (in dollars per share) $ 0.12 $ (0.12) $ 0.35 $ 0.09
DILUTED (in dollars per share) $ 0.12 $ (0.12) $ 0.35 $ 0.09
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME (LOSS) PER COMMON SHARE:        
BASIC (in shares) 45,912,512 46,006,290 45,865,395 45,916,536
DILUTED (in shares) 46,594,843 46,006,290 46,547,568 46,912,557