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Stock-Based Compensation - Summary of Nonvested Restricted Stock Unit Awards (Details) - Restricted Stock Units (RSUs)
9 Months Ended
Sep. 30, 2021
$ / shares
shares
RSUs Outstanding  
Unvested and Outstanding, Beginning Balance (in shares) | shares 1,100,000
Granted (in shares) | shares 4,905,295
Vested (in shares) | shares (931,588)
Cancelled (in shares) | shares (11,928)
Unvested and Outstanding, Ending Balance (in shares) | shares 5,061,779
Vested and Outstanding (in shares) | shares 142,153
Weighted-Average Grant Date Fair Value per Share  
Unvested and Outstanding, Beginning Balance (in dollars per share) | $ / shares $ 14.14
Granted (in dollars per share) | $ / shares 50.77
Vested (in dollars per share) | $ / shares 19.44
Cancelled (in dollars per share) | $ / shares 45.43
Unvested and Outstanding, Ending Balance (in dollars per share) | $ / shares 48.58
Vested and Outstanding (in dollars per share) | $ / shares $ 38.19