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STOCKHOLDERS' EQUITY - Restricted Stock Awards and Restricted Stock Units Activity (Details) - RSAs and RSUs
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of shares  
Beginning balance (in shares) | shares 15,622,645
Granted (in shares) | shares 4,256,680
Vested (in shares) | shares (5,179,004)
Forfeited (in shares) | shares (742,110)
Ending balance (in shares) | shares 13,958,211
Weighted Average Grant Date Fair Value  
Beginning balance (in USD per share) | $ / shares $ 71.71
Granted (in USD per share) | $ / shares 246.06
Vested (in USD per share) | $ / shares 68.22
Forfeited (in USD per share) | $ / shares 101.77
Ending balance (in USD per share) | $ / shares $ 124.57