Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Narrative (Details)

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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Restricted Stock Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense $ 3.2  
Unrecognized compensation expense, recognized period 1 year  
Fair value of vested awards $ 1.9 $ 2.6
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 authorized for grant (shares) 15,000,000  
Shares available for future awards (shares) 10,370,794  
2013 Equity Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for future awards (shares) 769,775