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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of shares      
Beginning, January 1, 2021 7,257,460    
Granted 1,696,327    
Exercised (1,120,981) (1,398,177) (214,845)
Forfeited (149,346)    
Expired (3,119)    
Balance, December 31, 2021 7,680,341 7,257,460  
Exercisable, December 31, 2021 3,473,716    
Weighted average exercise price      
Beginning, January 1, 2021 $ 12.14    
Granted 93.13    
Exercised 7.00    
Forfeited 41.47    
Expired 1.70    
Balance, December 31, 2021 30.19 $ 12.14  
Exercisable, December 31, 2021 $ 10.83    
Weighted average remaining contractual term (years)      
Balance, December 31, 2021 7 years 8 months 1 day    
Exercisable, December 31, 2021 6 years 9 months    
Aggregate intrinsic value      
Balance, December 31, 2021 $ 35,584    
Exercisable, December 31, 2021 $ 83,306