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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - 2020 Incentive Plan - RSU - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 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%  
Number of shares granted 0.1  
Fair value of grant (in dollars per share) $ 8.00  
Employee    
Stock-based compensation    
Number of shares granted   0.9
Unrecognized compensation expense other than options $ 3,600 $ 6,400
Weighted average remaining vesting period 2 years 6 months  
Employee | Tranche One    
Stock-based compensation    
Vesting period 4 years  
Number of shares granted 0.4  
Fair value of grant (in dollars per share) $ 11.89  
Employee | Tranche Two    
Stock-based compensation    
Number of shares granted 0.2  
Compensation expense recorded $ 0  
Fair value of grant (in dollars per share) $ 11.89  
Employee | Tranche Three    
Stock-based compensation    
Number of shares granted 0.3  
Fair value of grant (in dollars per share) $ 6.48  
Non-employee director    
Stock-based compensation    
Weighted average remaining vesting period   3 years 2 months 12 days