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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Jan. 14, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period of incentive plan   10 years    
Vesting period   4 years    
Weighted-average grant-date fair value per share of options granted (in dollars per share) $ 4.13 $ 4.82 $ 0.39  
Fair value of options vested   $ 319 $ 7  
Stock-based compensation expense   $ 3,643 $ 63  
Exercise Price (in dollars per share) $ 3.20      
Common stock, number of shares reserved   24,027,604 12,785,541  
2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized   8,336,573 1,795,102  
Number of shares available for grant   138,603 1,563,187  
2020 Plan | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, number of shares reserved       6,665,891
Increase of authorized shares, percent of common stock outstanding       4.00%
2020 ESPP | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, number of shares reserved       326,364
Increase of authorized shares, percent of common stock outstanding       1.00%
Unvested restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Fair value of restricted stock vested   $ 420 $ 40  
Stock-based compensation expense   1,973 53  
Unrecognized compensation cost   $ 11,315 $ 335  
Unrecognized compensation cost, recognition period   3 years 6 months 3 years 3 months 18 days  
First anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage   25.00%    
Thereafter        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Person possessing less than 10% of voting power        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum percent of fair market value of common stock   100.00%    
Person possessing more than 10% of voting power        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum percent of fair market value of common stock   110.00%    
Expiration period of incentive plan   5 years