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Employee Equity-Based Compensation - Summary Information for Outstanding and Exercisable Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Options Outstanding    
Number of options (shares) 7,633,731 8,045,461
Weighted average remaining contractual term (in years) 5 years 11 months 1 day  
Weighted average exercise price (usd per share) $ 14.09 $ 14.18
Weighted average fair value (usd per share) $ 8.78  
Aggregate intrinsic value (in thousands) $ 1,933  
Options Exercisable    
Number of options (shares) 5,063,626  
Weighted average remaining contractual term (in years) 4 years 10 months 13 days  
Weighted average exercise price (usd per share) $ 14.68  
Weighted average fair value (usd per share) $ 9.11  
Aggregate intrinsic value (in thousands) $ 1,929