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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenues:        
Collaboration agreements $ 4,825 $ 4,190 $ 15,065 $ 9,665
Research grants 882 717 2,199 3,058
Total revenues 5,707 4,907 17,264 12,723
Operating expenses:        
Research and development 8,703 7,570 26,201 22,427
General and administrative 3,163 3,139 9,595 9,125
Total operating expenses 11,866 10,709 35,796 31,552
Loss from operations (6,159) (5,802) (18,532) (18,829)
Interest and other income, net 14 12 52 43
Net loss $ (6,145) $ (5,790) $ (18,480) $ (18,786)
Basic and diluted net loss per share $ (0.11) $ (0.11) $ (0.34) $ (0.36)
Shares used in computing basic and diluted net loss per share 54,786 52,768 54,013 52,664