Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - Schedule of Equity-Based Compensation (Details)

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SHARE-BASED COMPENSATION - Schedule of Equity-Based Compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation expense $ 2,430,000 $ 3,652,000 $ 1,649,000
2018 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation expense 2,430,000 2,385,000 187,000
Earnout Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation expense 0 0 0
2014 Management Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation expense $ 0 $ 1,267,000 $ 1,462,000