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STATEMENTS OF OPERATIONS (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
STATEMENTS OF OPERATIONS [Abstract] |  |  |  |
Government contracts | $ 4,268 | $ 5,583 | $ 10,985 | $ 17,328
Research and development collaborations | 534 | 182 | 1,182 | 182
Total revenue | 4,802 | 5,765 | 12,167 | 17,510
Costs and expenses: |  |  |  |
Cost of government contracts revenue | 2,276 | 3,838 | 5,619 | 12,740
Research and development | 13,948 | 6,642 | 33,989 | 17,270
General and administrative | 3,857 | 2,134 | 10,740 | 7,670
Total costs and expenses | 20,081 | 12,614 | 50,348 | 37,680
Loss from operations | (15,279) | (6,849) | (38,181) | (20,170)
Other income (expense): |  |  |  |
Interest income | 53 | 39 | 149 | 111
Interest expense | (64) | (6) | (132) | (12)
Other expense | (10) |  | (10) |
Change in fair value of warrant liability |  | (401) | 267 | (401)
Loss from operations before income tax | (15,300) | (7,217) | (37,907) | (20,472)
Income tax expense |  |  | 22 |
Net loss | $ (15,300) | $ (7,217) | $ (37,929) | $ (20,472)
Basic and diluted net loss per share | $ (0.09) | $ (0.05) | $ (0.24) | $ (0.16)
Basic and diluted weighted average number of common shares outstanding | 168,537 | 134,178 | 156,555 | 127,246

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