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Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Operating expenses:        
Research and development $ 5,079 $ 3,682 $ 5,321 $ 8,205
General and administrative 4,232 2,049 6,496 4,179
Restructuring charges 165 0 2,723 0
Total operating expenses 9,476 5,731 14,540 12,384
Other income:        
Interest income 95 93 182 175
Net loss attributable to common stockholders (9,381) (5,638) (14,358) (12,209)
Other comprehensive loss:        
Unrealized gain/ (loss) on available for sale securities, net of tax 0 (3) (13) 6
Total other comprehensive loss $ (9,381) $ (5,641) $ (14,371) $ (12,203)
Net loss per share attributable to common stockholders—basic and diluted (in USD per share) $ (0.45) $ (0.27) $ (0.69) $ (0.59)
Common shares used to compute basic and diluted net loss per share attributable to common stockholders (in shares) 20,856,693 20,831,723 20,853,628 20,831,139