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STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
STATEMENTS OF OPERATIONS [Abstract] |  |  |  |
Government contracts | $ 3,276 | $ 7,103 | $ 6,717 | $ 11,745
Research and development collaborations | 255 |  | 648 |
Total revenue | 3,531 | 7,103 | 7,365 | 11,745
Costs and expenses: |  |  |  |
Cost of government contracts revenue | 1,632 | 5,118 | 3,344 | 8,903
Research and development | 10,785 | 5,371 | 20,041 | 10,627
General and administrative | 4,012 | 2,469 | 6,882 | 5,537
Total costs and expenses | 16,429 | 12,958 | 30,267 | 25,067
Loss from operations | (12,898) | (5,855) | (22,902) | (13,322)
Other income (expense): |  |  |  |
Interest income | 48 | 39 | 95 | 72
Interest expense | (45) | (3) | (68) | (6)
Change in fair value of warrant liability | 267 | (101) | 267 |
Loss from operations before income tax | (12,628) | (5,920) | (22,608) | (13,256)
Income tax expense | 5 |  | 22 |
Net loss | $ (12,633) | $ (5,920) | $ (22,630) | $ (13,256)
Basic and diluted net loss per share | $ (0.08) | $ (0.05) | $ (0.15) | $ (0.11)
Basic and diluted weighted average number of common shares outstanding | 152,312 | 126,925 | 150,391 | 123,741

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