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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenues:    
Collaboration revenue $ 2,373 $ 883
Grant revenue 1,125 760
Service and license revenue   442
Total revenues 3,498 2,085
Operating expenses:    
Research and development 13,231 14,164
General and administrative 4,157 8,800
Unoccupied facility expense 77  
Total operating expenses 17,465 22,964
Loss from operations (13,967) (20,879)
Other income (expense):    
Interest income 65 72
Interest expense   (32)
Other income 62 14
Net loss $ (13,840) $ (20,825)
Basic and diluted net loss per share $ (0.05) $ (0.11)
Weighted average number of shares used to compute basic and diluted net loss per share 262,826 182,847