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STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
STATEMENTS OF OPERATIONS [Abstract] |  |  |  |
Government contracts | $ 7,504 | $ 4,268 | $ 20,217 | $ 10,985
Research and development collaborations | 710 | 534 | 3,718 | 1,182
Total revenue | 8,214 | 4,802 | 23,935 | 12,167
Costs and expenses: |  |  |  |
Cost of government contracts revenue | 4,027 | 2,276 | 12,150 | 5,619
Research and development | 19,219 | 13,948 | 48,940 | 33,989
General and administrative | 4,757 | 3,857 | 14,871 | 10,740
Total costs and expenses | 28,003 | 20,081 | 75,961 | 50,348
Loss from operations | (19,789) | (15,279) | (52,026) | (38,181)
Other income (expense): |  |  |  |
Interest income | 128 | 53 | 160 | 149
Interest expense | (47) | (64) | (150) | (132)
Other income (expense) | (19) | (10) |  | (10)
Change in fair value of warrant liability |  |  |  | 267
Realized gains on investments |  |  | 615 |
Loss from operations before income tax | (19,727) | (15,300) | (51,401) | (37,907)
Income tax expense |  |  |  | 22
Net loss | $ (19,727) | $ (15,300) | $ (51,401) | $ (37,929)
Basic and diluted net loss per share | $ (0.08) | $ (0.09) | $ (0.23) | $ (0.24)
Basic and diluted weighted average number of common shares outstanding | 238,304 | 168,537 | 221,578 | 156,555

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