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Equity and Equity Compensation Plans - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Restricted Stock Units  
Unvested outstanding at January 1, 2019 (in shares) | shares 5,023,412
Granted (in shares) | shares 1,658,632
Vested (in shares) | shares (1,490,506)
Forfeited or canceled (in shares) | shares (731,795)
Unvested outstanding at December 31, 2019 (in shares) | shares 4,459,743
Weighted Average Grant-Date Fair Value  
Unvested outstanding at January 1, 2019 (in dollars per share) | $ / shares $ 18.69
Granted (in dollars per share) | $ / shares 43.01
Vested (in dollars per share) | $ / shares 19.12
Forfeited or canceled (in dollars per share) | $ / shares 19.56
Unvested outstanding at December 31, 2019 (in dollars per share) | $ / shares $ 27.44