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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
Condensed Statements of Operations        
License fees $ 1,036 $ 1,036 $ 3,108 $ 3,108
Operating expenses:        
Research and development 6,982 10,491 20,965 31,692
General and administrative 3,686 2,547 9,962 7,085
Sales and marketing 1,615 1,006 6,676 2,931
Total operating expenses 12,283 14,044 37,603 41,708
Loss from operations (11,247) (13,008) (34,495) (38,600)
Investment income 103 67 220 188
Interest expense (16) (11) (53) (21)
Net loss $ (11,160) $ (12,952) $ (34,328) $ (38,433)
Net loss per share-basic and diluted (in dollars per share) $ (0.16) $ (0.21) $ (0.52) $ (0.66)
Weighted average common shares outstanding-basic and diluted (in shares) 70,559 60,531 66,389 58,104