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Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Revenues: |  |
Collaboration agreements | $ 7,568 | $ 4,083
Research grants | 548 | 540
Total revenues | 8,116 | 4,623
Operating expenses: |  |
Research and development | 12,033 | 8,220
General and administrative | 3,644 | 3,308
Change in fair value of contingent liability | 50 |
Total operating expenses | 15,727 | 11,528
Loss from operations | (7,611) | (6,905)
Interest and other income, net | 39 | 20
Net loss | $ (7,572) | $ (6,885)
Basic and diluted net loss per share | $ (0.12) | $ (0.13)
Shares used in computing basic and diluted net loss per share | 63,199 | 53,377

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