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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 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]            
Net loss $ (68,806) $ (46,205) $ (32,393) $ (31,806) $ (115,011) $ (64,199)
Weighted average shares outstanding, basic and diluted 68,164   53,369   67,675 51,938
Net loss per share, basic and diluted $ (1.01)   $ (0.61)   $ (1.70) $ (1.24)