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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
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:      
Net loss $ (98,849) $ (53,845) $ (55,545)
Denominator:      
Weighted-average common shares outstanding, basic and diluted (in shares) 51,036,824 48,731,791 46,456,825
Net loss per share, basic and diluted (in dollars per share) $ (1.94) $ (1.10) $ (1.20)