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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement [Abstract]        
Revenues $ 170   $ 275 $ 8
Operating expenses        
Research and development 1,610 $ 1,729 2,528 3,491
General and administrative 9,879 722 11,812 1,379
Total operating expenses 11,489 2,451 14,340 4,870
Loss from operations (11,319) (2,451) (14,065) (4,862)
Interest expense (327) (5,613) (511) (6,868)
Loss on the conversion of convertible notes (1,170)   (1,170)  
Fair value adjustment of preferred stock warrant liability 582 1,123 1,309 1,275
Fair value adjustment of derivative liability (2,692)   (2,291)  
Other income, net 29   29 1
Net loss (14,897) (6,941) (16,699) (10,454)
Net Loss Attributable to Common Stockholders $ (14,897) $ (6,954) $ (16,699) $ (10,481)
Net loss per share attributable to common stockholders, basic and diluted $ (2.66) $ (2.21) $ (3.79) $ (3.33)
Weighted average shares used to compute basic and diluted net loss per share attributable to common stockholders 5,608,429 3,145,521 4,401,087 3,145,283