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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
May 24, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, capital shares reserved for future issuance           250,000
Common stock reserved for issuance to participants 100,134   100,134      
Granted, Number of share of restricted stock (shares)     152,171      
Stock-based compensation $ 794 $ 93 $ 1,096 $ 237    
Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, Number of share of restricted stock (shares)     172,033 10,310    
Total compensation cost not yet recognized 1,713   $ 1,713      
Weighted average service period     1 year 5 months 12 days      
Granted, weighted average grant date fair value (usd per share)     $ 15.83 $ 9.01    
Stock-based compensation $ 702 93 $ 914 $ 237    
Restricted stock units, type 1            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, Number of share of restricted stock (shares)     66,220      
Restricted stock units, type 1 | Vesting period one            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, Number of share of restricted stock (shares) 53,075          
Restricted stock units, type 2            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, Number of share of restricted stock (shares)     60,451      
Restricted stock units, type 2 | Vesting period two            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, Number of share of restricted stock (shares) 73,596          
Restricted stock units, time            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, Number of share of restricted stock (shares)     25,500      
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price as a percentage of the fair market value of a share of common stock     100.00%      
Expired, number of options (shares)         5,000  
Options, outstanding, weighted average exercise price         $ 24.90  
Stock options | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expiration period     5 years      
Stock options | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expiration period     10 years      
Restricted common stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, Number of share of restricted stock (shares)     52,226      
Total compensation cost not yet recognized $ 226   $ 226      
Granted, weighted average grant date fair value (usd per share)     $ 9.57      
Remaining expected life     11 months 1 day      
Stock-based compensation $ 92 $ 0 $ 182 $ 0    
Non-Employee Director | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted, Number of share of restricted stock (shares)     19,862      
Number outstanding 228,185   228,185