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Net Loss Per Share - Summary of Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]    
Net loss $ (52,412) $ (75,305)
Deemed dividend resulting from extinguishment upon modification of Series C preferred stock 177,789  
Net loss attributable to common stockholders $ (230,201) $ (75,305)
Net loss attributable to common stockholders per share, basic and diluted $ (5.40) $ (21.82)
Weighted average shares of common stock, basic and diluted 42,619,582 3,450,500