Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Narrative (Details)

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STOCK-BASED COMPENSATION - Narrative (Details)
$ in Millions
3 Months Ended
Sep. 18, 2020
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Reverse stock split ratio 0.1    
Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense   $ 3.8  
Unrecognized compensation expense, recognized period   1 year 2 months 12 days  
Fair value of vested awards   $ 1.8 $ 1.2
Restricted Stock Awards | Employees and Executive Officers      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   3 years  
Restricted Stock Awards | Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   1 year  
2018 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future awards (shares) | shares   769,755