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STOCKHOLDERS' EQUITY - Stock Options (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Stock-based compensation    
Unrecognized compensation expense stock option $ 0.5  
Stock options    
Stock-based compensation    
Vesting period 4 years  
Percentage of awards vesting on the annual anniversary date of the grant 25.00%  
Expiration term 7 years  
Weighted average remaining vesting period 1 year 6 months  
2020 Incentive Plan | Stock options    
Stock-based compensation    
Unrecognized compensation expense stock option   $ 1.2
Weighted average remaining vesting period   2 years