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Basic and Diluted Net Loss Per Share - Summary of Antidilutive Securities Excluded From Computation Of Earnings Per Share (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Options to purchase common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 0 2,847,629 0 2,847,629
Warrants to purchase common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 35,476,667 0 35,476,667 0
Warrants to purchase redeemable convertible preferred stock, as-converted        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 0 5,554,470 0 5,554,470