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Stockholders' Deficit - Summary of Shares of Common Stock Reserved for Future Issuance (Details) - shares
Mar. 31, 2021
Dec. 31, 2020
Equity [Abstract]    
Conversion of convertible preferred stock 75,305,400 75,305,400
Stock options outstanding 29,308,725 32,458,408
RSUs outstanding 6,151,271 3,276,600
Shares available for future grants 18,213,838 8,098,484
Total shares of common stock reserved 128,979,234 119,138,892