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STOCK-BASED COMPENSATION - Description of Equity Incentive Plans Narrative (Details) - $ / shares
Jun. 30, 2021
May 19, 2021
Dec. 31, 2020
May 20, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, par value (in usd per share) $ 0.00001 $ 0.00001 $ 0.00001 $ 0.00001
2021 Plan, Newly Reserved Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Capital shares reserved for future issuance   9,100,456    
2021 Plan, Returning Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Capital shares reserved for future issuance   5,256,517