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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net revenue      
Licensing and other $ 1,340 $ 5,987 $ 6,468
Royalty 4,742 8,120 9,095
Total net revenue 6,082 14,107 15,563
Cost of net revenue      
Licensing and other 334 3,295 2,826
Total cost of net revenue 334 3,295 2,826
Gross profit 5,748 10,812 12,737
Operating expenses      
Research and development 28,480 26,216 25,534
Selling, general and administrative 8,218 8,869 10,391
Gain on sale of assets (3,291) (35,611)  
Total operating expenses 33,407 (526) 35,925
Income (loss) from operations (27,659) 11,338 (23,188)
Other income and expense, net 155 206 177
Income (loss) before income taxes (27,504) 11,544 (23,011)
Income tax provision 110 288 51
Net income (loss) (27,614) 11,256 (23,062)
Other comprehensive income (loss), net of tax:      
Net unrealized gains (losses) on available-for-sale securities 10 (3) (37)
Comprehensive income (loss) $ (27,604) $ 11,253 $ (23,099)
Net income (loss) per share      
Basic (in dollars per share) $ (0.70) $ 0.30 $ (0.72)
Diluted (in dollars per share) $ (0.70) $ 0.28 $ (0.72)
Shares used in computing net income (loss) per share      
Basic (in shares) 39,176 37,861 31,870
Diluted (in shares) 39,176 40,377 31,870