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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Mar. 27, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (shares) 71,700   72,300 78,100  
2008 Equity Incentive Plan and 2018 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense related to awards $ 3 $ 4      
2008 Equity Incentive Plan and 2018 Equity Incentive Plan | Restricted stock awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense related to awards $ 171 $ 139      
2018 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock reserved and available for issuance (shares)         350,000
2018 Equity Incentive Plan | Restricted stock awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-option instruments outstanding (shares) 163,974        
2018 Equity Incentive Plan | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (shares) 0        
2008 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of Equity Incentive Plan 10 years        
Options granted (shares) 71,700        
Expiry period of unexercised incentive stock options 10 years        
2008 Equity Incentive Plan | Restricted stock awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-option instruments granted (shares) 3,619        
2008 Equity Incentive Plan | Restricted stock awards | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of shares, in years 2 years        
2008 Equity Incentive Plan | Restricted stock awards | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of shares, in years 5 years        
2008 Equity Incentive Plan | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of shares, in years 5 years