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STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - 2020 Equity Incentive Plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 7,616 $ 4,138
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 634 300
Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 6,509 3,789
Common Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 473 $ 49