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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - 2020 Incentive Plan - RSU - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Stock-based compensation    
Vesting period 4 years  
Percentage of awards other than options vesting on the annual anniversary date of the grant 25.00% 25.00%
Number of shares granted 0.1  
Fair value of grant (in dollars per share) $ 8.00  
Tranche One    
Stock-based compensation    
Fair value of grant (in dollars per share)   $ 11.55
Minimum | Tranche One    
Stock-based compensation    
Fair value of grant (in dollars per share)   $ 4.36
Employee    
Stock-based compensation    
Number of shares granted   1.0
Unrecognized compensation expense other than options $ 2,700 $ 4,900
Weighted average remaining vesting period 2 years  
Fair value of grant (in dollars per share)   $ 6.13
Employee | Tranche One    
Stock-based compensation    
Vesting period   4 years
Number of shares granted   0.4
Employee | Tranche Two    
Stock-based compensation    
Number of shares granted   0.2
Compensation expense recorded $ 0  
Fair value of grant (in dollars per share)   $ 11.32
Employee | Tranche Three    
Stock-based compensation    
Number of shares granted   0.4
Fair value of grant (in dollars per share)   $ 6.48
Employee | Minimum | Tranche Two    
Stock-based compensation    
Fair value of grant (in dollars per share)   7.88
Employee | Minimum | Tranche Three    
Stock-based compensation    
Fair value of grant (in dollars per share)   4.05
Employee | Maximum | Tranche One    
Stock-based compensation    
Fair value of grant (in dollars per share)   11.89
Employee | Maximum | Tranche Two    
Stock-based compensation    
Fair value of grant (in dollars per share)   11.89
Employee | Maximum | Tranche Three    
Stock-based compensation    
Fair value of grant (in dollars per share)   $ 6.48
Non-employee director    
Stock-based compensation    
Weighted average remaining vesting period   2 years 8 months 12 days