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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 01, 2021
Dec. 31, 2020
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Jan. 14, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted-average grant-date fair value per share of options granted (in dollars per share)     $ 4.13 $ 15.18 $ 4.82  
Fair value of options vested       $ 4,198 $ 319  
Stock-based compensation expense       7,765 3,643  
Exercise Price (in dollars per share)     $ 3.20      
Unrecognized compensation cost, options   $ 28,388   $ 28,388    
2020 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, number of shares reserved   5,050,607   5,050,607   6,665,891
Increase of authorized shares, percent of common stock outstanding           4.00%
2020 Plan | Non-employees            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense       $ 17    
Shares issued in period   505        
2020 Plan | Subsequent event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Increase in number of shares authorized 1,443,135          
2020 ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, number of shares reserved   326,364   326,364   326,364
Increase of authorized shares, percent of common stock outstanding           1.00%
2020 ESPP | Subsequent event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Increase in number of shares authorized 326,364          
Unvested restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       3 years    
Fair value of restricted stock vested       $ 200 420  
Stock-based compensation expense       $ 404 $ 1,973  
Unrecognized compensation cost, recognition period       1 year 10 months 24 days    
Unrecognized compensation cost   $ 1,405   $ 1,405    
Options to purchase common stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost, recognition period       2 years 9 months 18 days