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Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:
Collaboration revenue	$ 1,795	$ 1,110	$ 6,199	$ 3,349
Grant revenue	414	1,700	2,546	3,855
Service and license revenue		117	10	1,200
Total revenues	2,209	2,927	8,755	8,404
Operating expenses:
Research and development	28,072	11,770	64,942	38,739
General and administrative	4,083	5,807	12,325	22,243
Unoccupied facility expense	131	918	386	918
Total operating expenses	32,286	18,495	77,653	61,900
Loss from operations	(30,077)	(15,568)	(68,898)	(53,496)
Other income (expense):
Interest income	42	37	162	163
Interest expense		(24)		(83)
Other income (expense)	216	(120)	300	(248)
Net loss	$ (29,819)	$ (15,675)	$ (68,436)	$ (53,664)
Basic and diluted net loss per share	$ (0.11)	$ (0.09)	$ (0.26)	$ (0.29)
Weighted average number of shares used to compute basic and diluted net loss per share	262,908	183,022	262,883	182,960

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