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Stock Incentive Plans - Restricted Stock Units (Details) - Restricted Stock Units (RSUs)
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of Restricted Stock Units  
Balance at beginning of the period (in shares) | shares 4,430,336
Granted (in shares) | shares 7,420,972
Vested (in shares) | shares (1,985,645)
Canceled and forfeited (in shares) | shares (649,478)
Balance at the end of the period (in shares) | shares 9,216,185
Weighted-average grant date fair value per share  
Balance at the beginning of the period (in dollars per share) | $ / shares $ 4.93
Grant (in dollars per share) | $ / shares 20.58
Vested (in dollars per share) | $ / shares 7.60
Canceled and forfeited (in dollars per share) | $ / shares 11.78
Balance at the end of the period (in dollars per share) | $ / shares $ 15.85