Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - The Earnout Incentive Plan (Details)

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SHARE-BASED COMPENSATION - The Earnout Incentive Plan (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
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
Earnout Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense   $ 0 $ 0 $ 0
Earnout Incentive Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Issued during period (in shares) 0      
Restricted stock units, number of shares issued (in shares) 95,057      
Restricted stock units, grant-date fair value (in dollars per share) $ 10.52      
2018 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units, number of shares issued (in shares)   1,031,740 36,657 202,200
Equity-based compensation expense   $ 2,430,000 $ 2,385,000 $ 187,000
2018 Equity Incentive Plan | Restricted Stock Units (RSUs) - Performance Based With Market Condition        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units, number of shares issued (in shares) 95,057 139,598,000   95,057,000
Restricted stock units, grant-date fair value (in dollars per share)   $ 2,560   $ 10,520