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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net revenue      
Licensing $ 5,987 $ 6,468 $ 3,476
Royalty 8,120 9,095 7,982
Total net revenue 14,107 15,563 11,458
Cost of net revenue      
Licensing 3,295 2,826 1,993
Total cost of net revenue 3,295 2,826 1,993
Gross profit 10,812 12,737 9,465
Operating expenses      
Research and development 26,216 25,534 19,255
Selling, general and administrative 8,869 10,391 9,507
Gain on sale of patents (35,611)    
Restructuring charges     706
Total operating expenses (526) 35,925 29,468
Income (loss) from operations 11,338 (23,188) (20,003)
Other income and expense, net 206 177 744
Income (loss) before income taxes 11,544 (23,011) (19,259)
Income tax provision (benefit) 288 51 (155)
Net income (loss) $ 11,256 $ (23,062) $ (19,104)
Net income (loss) per share      
Basic (in dollars per share) $ 0.30 $ (0.72) $ (0.61)
Diluted (in dollars per share) $ 0.28 $ (0.72) $ (0.61)
Shares used in computing net income (loss) per share      
Basic (in shares) 37,861 31,870 31,238
Diluted (in shares) 40,377 31,870 31,238