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Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Details) - Unvested RSUs
6 Months Ended
Jun. 30, 2022
$ / shares
shares
Number of Shares  
Unvested as of December 31, 2021 (in shares) | shares 13,696,836
Granted (in shares) | shares 6,089,462
Vested (in shares) | shares (2,052,726)
Forfeited (in shares) | shares (881,543)
Unvested as of June 30, 2022 (in shares) | shares 16,852,029
Weighted-Average Grant-Date Fair Value  
Unvested as of December 31, 2021 (USD per share) | $ / shares $ 85.96
Granted (USD per share) | $ / shares 66.22
Vested (USD per share) | $ / shares 83.49
Forfeited (USD per share) | $ / shares 84.69
Unvested as of June 30, 2022 (USD per share) | $ / shares $ 79.20