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Stock-based Compensation - Summary of RSA Activity (Details) - Unvested RSAs
9 Months Ended
Sep. 30, 2021
$ / shares
shares
RSA's  
Unvested shares as of December 31, 2020 | shares 7,562,503
Vested | shares (3,968,751)
Forfeited | shares 18,750
Unvested shares as of September 30, 2021 | shares 3,575,002
Weighted-Average Grant Date Fair Value per Share  
Unvested shares as of December 31, 2020 | $ / shares $ 0.0001
Vested | $ / shares 0.0001
Forfeited | $ / shares 0.0001
Unvested shares as of September 30, 2021 | $ / shares $ 0.0001