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Equity-Based Compensation - Stock Options (Details) - Stock options - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Units    
Outstanding, beginning (in shares) 2,401,382  
Granted (in shares) 2,388,340  
Exercised (in shares) (676,649)  
Cancelled (in shares) (433,142)  
Outstanding, end (in shares) 3,679,931 2,401,382
Options exercisable, end (in shares) 900,142  
Weighted Average Exercise Price    
Outstanding, beginning (in dollars per share) $ 12.63  
Granted (in dollars per share) 16.01  
Exercised (in dollars per share) 10.78  
Cancelled (in dollars per share) 14.38  
Outstanding, end (in dollars per share) 14.96 $ 12.63
Options exercisable, end (in dollars per share) $ 13.72  
Stock options    
Weighted average remaining contractual term 8 years 3 days 8 years 4 months 9 days
Weighted average remaining contractual term, exercisable 7 years 9 months 3 days  
Aggregate intrinsic value, beginning $ 6,523  
Aggregate intrinsic value, end 123,600 $ 6,523
Aggregate intrinsic value, exercisable $ 31,332  
Weighted average grant date fair value (in dollars per share) $ 11.29