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EQUITY-BASED COMPENSATION - Share-repurchases (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Decrease in paid-in capital $ 238,000 $ 1,206,000 $ 10,876,000
2016 plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares repurchased in open market     1,989,440
Number of shares repurchased with employee minimum tax withholding requirements 43,923   210,384
Number of shares available for grant   2,800,000  
Decrease in paid-in capital   $ 1,200,000  
Class A Common Stock | 2016 plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares repurchased with employee minimum tax withholding requirements   199,976  
Decrease in Class A common stock   $ 2,000