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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net revenue |  |  |
Licensing and other | $ 781 | $ 1,340 | $ 5,987
Royalty | 3,617 | 4,742 | 8,120
Total net revenue | 4,398 | 6,082 | 14,107
Cost of net revenue |  |  |
Licensing and other | 474 | 334 | 3,295
Total cost of net revenue | 474 | 334 | 3,295
Gross profit | 3,924 | 5,748 | 10,812
Operating expenses |  |  |
Research and development | 23,325 | 28,480 | 26,216
Selling, general and administrative | 6,161 | 8,218 | 8,869
Gain on sale of assets | (630) | (3,291) | (35,611)
Total operating expenses | 28,856 | 33,407 | (526)
Income (loss) from operations | (24,932) | (27,659) | 11,338
Other income, net | 209 | 155 | 206
Income (loss) before income taxes | (24,723) | (27,504) | 11,544
Income tax provision | 71 | 110 | 288
Net income (loss) | (24,794) | (27,614) | 11,256
Other comprehensive income (loss), net of tax: |  |  |
Net unrealized gains (losses) on available-for-sale securities | 2 | 10 | (3)
Comprehensive income (loss) | $ (24,792) | $ (27,604) | $ 11,253
Net income (loss) per share |  |  |
Basic (in dollars per share) | $ (0.55) | $ (0.70) | $ 0.30
Diluted (in dollars per share) | $ (0.55) | $ (0.70) | $ 0.28
Shares used in computing net income (loss) per share |  |  |
Basic (in shares) | 45,246 | 39,176 | 37,861
Diluted (in shares) | 45,246 | 39,176 | 40,377

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