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Equity-Based Compensation - Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Equity-based compensation    
Equity-based compensation expense $ 11,175 $ 7,972
Acceleration of equity awards expense   600
Modification of equity awards expense 1,500 100
Research and development expense    
Equity-based compensation    
Equity-based compensation expense 3,554 2,425
General and administrative expense    
Equity-based compensation    
Equity-based compensation expense $ 7,621 $ 5,547