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Stock-Based Compensation - Restricted Stock Units (Details) - Restricted stock units
 9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of Shares (in shares)  
Unvested at beginning of period (in shares) 2,904,616
Granted (in shares) 872,135
Forfeited (in shares) (182,761)
Vested (in shares) (1,557,830)
Unvested at end of period (in shares) 2,036,160
Weighted- Average Grant Date Fair Value (in dollars per share)  
Unvested at beginning of period (in dollars per share) | $ / shares $ 35.72
Granted (in dollars per share) | $ / shares 108.00
Forfeited (in dollars per share) | $ / shares 63.62
Vested (in dollars per share) | $ / shares 30.63
Unvested at end of period (in dollars per share) | $ / shares $ 68.96
Number of vested shares recipient elected to defer settlement (in shares) 402,832
Number of vested shares recipients elected to defer settlement, released during period (in shares) 270,567
Number of deferred shares vested and outstanding (in shares) 695,869