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Net Loss Per Share Attributable to Common Stockholders - Computation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Net loss $ (5,365) $ (6,231) $ (17,574) $ (16,194)
Accretion of convertible preferred stock to redemption value 0 0 0 (448)
Accrued dividends on convertible preferred stock 0 (1,554) 0 (3,769)
Net loss attributable to common stockholders—basic and diluted $ (5,365) $ (7,785) $ (17,574) $ (20,411)
Weighted-average number of common shares—basic and diluted (in shares) 20,835,868 94,753 20,832,727 91,650
Net loss per share attributable to common stockholders—basic and diluted (in USD per share) $ (0.26) $ (82.16) $ (0.84) $ (222.70)