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Condensed Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Operating expenses:        
Research and development $ 14,427 $ 10,806 $ 26,198 $ 17,946
General and administrative 4,364 4,403 9,915 10,016
Total operating expenses 18,791 15,209 36,113 27,962
Loss from operations (18,791) (15,209) (36,113) (27,962)
Interest expense (220) (204) (436) (405)
Net loss $ (19,011) $ (15,413) $ (36,549) $ (28,367)
Basic and diluted net loss per share (in Dollars per share) $ (0.78) $ (1.01) $ (1.52) $ (1.86)
Shares used in computing basic and diluted net loss per share (in Shares) 24,266 15,285 23,989 15,269