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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
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share Basic And Diluted [Abstract]    
Net loss $ (15,448) $ (8,075)
Weighted-average common shares outstanding — basic 37,832 36,205
Weighted-average common shares, outstanding — diluted 37,832 36,205
Net loss per share, basic and diluted $ (0.41) $ (0.22)