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Net Loss Per Share - Summary of Basic and Diluted Net Loss Per Share of Common Stock (Detail) - 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 $ (10,194) $ (11,825) $ (39,226) $ (28,751)
Accretion of preferred stock to redemption value       (35,061)
Beneficial conversion charge relating to IPO participation payment   (14,161)   (14,161)
Net loss attributable to common stockholders, basic and diluted $ (10,194) $ (25,986) $ (39,226) $ (77,973)
Weighted-average common shares outstanding, basic and diluted 41,482,173 33,020,484 41,033,080 19,544,759
Net loss per share attributable to common stockholders, basic and diluted $ (0.25) $ (0.79) $ (0.96) $ (3.99)