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Stock-Based Compensation - Status of Our Stock Options (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Shares      
Outstanding, beginning balance (in shares) 3,785,941 5,318,759 6,839,417
Granted (in shares) 1,232,056 845,120 969,720
Exercised (in shares) (1,372,564) (2,310,934) (2,309,451)
Forfeited (in shares) (684,238) (67,004) (180,927)
Outstanding, ending balance (in shares) 2,961,195 3,785,941 5,318,759
Exercisable (in shares) 1,668,356    
Weighted Average Exercise Price      
Outstanding , beginning balance (in dollars per share) $ 15.21 $ 9.97 $ 7.63
Granted (in dollars per share) 42.13 28.33 19.70
Exercised (in dollars per share) 9.97 7.96 6.83
Forfeited (in dollars per share) 29.70 16.37 13.34
Outstanding, ending balance (in dollars per share) 25.46 $ 15.21 $ 9.97
Weighted average exercise price, exercisable (in dollars per share) $ 15.29