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STOCK-BASED COMPENSATION - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2021
shares
Sep. 30, 2021
USD ($)
plan
shares
Sep. 30, 2021
USD ($)
plan
shares
Dec. 31, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of equity plans maintained | plan   3 3  
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period     10 years  
Cost not yet recognized, amount | $   $ 9,309 $ 9,309  
Cost not yet recognized, period for recognition     1 year 10 months 24 days  
Vested (in shares) 148,315   652,983  
Unvested (in shares)   1,276,188 1,276,188 1,857,444
Granted (in shares)     71,727  
Restricted stock units with time-based vesting conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested (in shares)   148,315 148,315  
Restricted stock units with market-based vesting conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)   0 0  
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cost not yet recognized, amount | $   $ 1,120 $ 1,120  
Cost not yet recognized, period for recognition     2 years 21 days  
2020 Employee, Director, and Consultant Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant (in shares)   2,119,223 2,119,223