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Net Loss per Share - Schedule of Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share Basic [Line Items]        
Net loss attributable to common stockholders $ (18,695) $ (18,987) $ (35,595) $ (45,681)
Weighted average shares of common stock outstanding, basic and diluted 112,298,982 48,163,094 100,850,878 48,111,186
Net loss per share attributable to common stockholders $ (0.17) $ (0.39) $ (0.35) $ (0.95)
Common Stock [Member]        
Earnings Per Share Basic [Line Items]        
Weighted average shares of common stock outstanding, basic and diluted 110,140,653 48,163,094 98,692,549 48,111,186
Pre-Funded Warrants [Member]        
Earnings Per Share Basic [Line Items]        
Weighted average shares of common stock outstanding, basic and diluted 2,158,329   2,158,329