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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Revenues: |  |  |  |
Collaboration revenue | $ 930 | $ 2,031 | $ 1,401 | $ 4,404
Grant revenue | 101 | 1,007 | 249 | 2,132
Service and license revenue | 519 | 10 | 527 | 10
Total revenues | 1,550 | 3,048 | 2,177 | 6,546
Operating expenses: |  |  |  |
Research and development | 19,686 | 23,639 | 41,906 | 36,870
General and administrative | 5,098 | 4,085 | 9,957 | 8,242
Unoccupied facility expense |  | 178 |  | 255
Total operating expenses | 24,784 | 27,902 | 51,863 | 45,367
Loss from operations | (23,234) | (24,854) | (49,686) | (38,821)
Other income (expense): |  |  |  |
Interest income | 18 | 55 | 45 | 120
Interest expense | (263) |  | (510) |
Other (loss) income, net | (112) | 22 | 343 | 84
Net loss | $ (23,591) | $ (24,777) | $ (49,808) | $ (38,617)
Basic and diluted net loss per share | $ (0.80) | $ (0.94) | $ (1.70) | $ (1.47)
Weighted average shares used to compute basic and diluted net loss per share | 29,335 | 26,286 | 29,230 | 26,286

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