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PREFERRED STOCK AND SHAREHOLDERS' EQUITY - RSUs activity (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Restricted stock units    
RSUs activity    
Outstanding December 31, 2019 915,730  
Awarded 794,448 915,730
Forfeited (600)  
Outstanding December 31, 2020 1,709,578 915,730
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Outstanding December 31, 2019 $ 5.17  
Awarded   $ 5.17
Outstanding December 31, 2020   $ 5.17
Vesting period (in years)   4 years
RSUs subject to continued service and liquidity-based conditions    
RSUs activity    
Options and RSUs vesting period 699,448