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Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
REVENUE      
Contract revenue     $ 646
OPERATING EXPENSES      
Research and development 32,780 15,174 8,207
General and administrative 21,677 8,657 3,501
Total operating expenses 54,457 23,831 11,708
Operating loss (54,457) (23,831) (11,062)
OTHER INCOME (EXPENSES)      
Interest expense, net (826) (599) (373)
Loss from continuing operations (55,283) (24,430) (11,435)
Gain (loss) from discontinued operations   1,082 (379)
Net loss $ (55,283) $ (23,348) $ (11,814)
Basic and diluted net loss per share:      
Loss from continuing operations (in Dollars per share) $ (3.42) $ (2.00) $ (1.90)
Net loss (in Dollars per share) $ (3.42) $ (1.91) $ (1.96)
Weighted-average common shares used to compute basic and diluted net loss per share (in Shares) 16,163 12,223 6,013