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Loss Per Share - Schedule of Basic and Diluted Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Net loss $ (19,066) $ (22,702) $ (22,219) $ (21,356) $ (23,963) $ (15,356) $ (15,593) $ (12,631) $ (85,343) $ (67,543) $ (31,634)
Weighted average shares outstanding, basic and diluted 44,215 43,161 42,836 42,043 39,155 35,189 34,916 34,723 43,069 36,006 22,222
Net loss per share, basic and diluted $ (0.43) $ (0.53) $ (0.52) $ (0.51) $ (0.61) $ (0.44) $ (0.45) $ (0.36) $ (1.98) $ (1.88) $ (1.42)