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Employee Equity-Based Compensation - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Aug. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Equity-based compensation expense   $ 4,199,000 $ 3,397,000
Unrecognized equity-based compensation cost   23,400,000  
Shares issuable upon the release of restricted stock awards      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Unrecognized equity-based compensation cost, restricted stock units   800,000  
Performance-based stock options      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Equity-based compensation expense   $ 0 100,000
Contractual life   10 years  
Granted (shares) 225,000    
Vested (shares)   75,000  
Forfeited (shares)   100,000  
Outstanding (shares)   125,000  
Shares outstanding not achieved performance targets or expensed (shares)   50,000  
Performance-based stock options | Minimum      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Vesting period   1 year  
Performance-based stock options | Minimum | Granted in 2018      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Vesting period   5 years  
Performance-based stock options | Maximum      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Vesting period   2 years  
Performance-based stock options | Maximum | Granted in 2018      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Vesting period   6 years  
Performance-based restricted stock units      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Vesting period   3 years  
Contractual life   10 years  
Granted (shares)   95,866  
Property and equipment      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Equity-based compensation expense   $ 100,000 $ 100,000