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Employee Equity-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2018
Sep. 30, 2020
Sep. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Unrecognized equity-based compensation cost   $ 17.4 $ 17.4
Shares issuable upon the release of restricted stock units      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Unrecognized equity-based compensation cost, restricted stock units   $ 3.9 $ 3.9
Performance-based stock option expense      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Contractual life     10 years
Granted (shares) 225,000   105,000
Vested (shares) 75,000 22,500 22,500
Forfeited (shares) 150,000   50,000
Performance-based stock option expense | Minimum      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Vesting period     1 year
Performance-based stock option expense | Minimum | Granted in 2018      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Vesting period     5 years
Performance-based stock option expense | Maximum      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Vesting period     2 years
Performance-based stock option expense | Maximum | Granted in 2018      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Vesting period     7 years
Performance-based RSU expense      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Contractual life     10 years
Granted (shares)     361,338
Vested (shares)   40,500 40,500
Outstanding (shares)   306,785 306,785
Performance-based RSU expense | Minimum      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Vesting period     1 year
Performance-based RSU expense | Maximum      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Vesting period     3 years