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Net Loss per Share - Summary of Reconciliation of Denominator Used in Calculation of Basic and Diluted Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share Basic And Diluted [Abstract]        
Net loss $ (10,583) $ (10,515) $ (28,179) $ (31,733)
Weighted-average common shares outstanding — basic 37,047 35,393 36,639 35,038
Weighted-average common shares, outstanding — diluted 37,047 35,393 36,639 35,038
Net loss per share, basic and diluted $ (0.29) $ (0.30) $ (0.77) $ (0.91)