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Net Loss Per Share - Schedule of Potentially Dilutive Securities (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of dilutive net loss per share 47,136,069 236,319,363 47,136,069 236,319,363
Convertible Preferred Stock        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of dilutive net loss per share 0 194,474,431 0 194,474,431
Unvested RSAs        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of dilutive net loss per share 3,575,002 9,486,462,000 3,575,002 9,486,462,000
Options        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of dilutive net loss per share 43,561,067 32,358,470 43,561,067 32,358,470