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Net Loss Per Share Attributable to Common Stockholders - Computation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Net loss attributable to common stockholders—basic and diluted $ (9,381) $ (5,638) $ (14,358) $ (12,209)
Weighted-average number of common shares—basic and diluted (in shares) 20,856,693 20,831,723 20,853,628 20,831,139
Net loss per share attributable to common stockholders—basic and diluted (in USD per share) $ (0.45) $ (0.27) $ (0.69) $ (0.59)