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STOCK BASED COMPENSATION - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock reserved for new awards (in shares)   3,360,000   3,360,000    
Common stock available for grant (in shares)   2,111,481   2,111,481   2,332,775
RSUs and RSAs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period 3 years          
Stock-based compensation expense   $ 882,000 $ 676,000 $ 1,800,000 $ 1,500,000  
Fair value of awards vested   80,000 $ 0 2,500,000 $ 5,700,000  
Unrecognized compensation expense   $ 4,300,000   $ 4,300,000   $ 3,500,000
Restricted stock awards or units granted (in shares)   561,430   561,430   582,940
Period of recognition for unrecognized compensation expense       1 year 10 months 6 days   1 year 7 months 9 days
RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units vested (in shares)   165,185   165,185   135,059
Forfeited (in shares)   0 14,041 1,468 14,041  
Non-employee directors | Restricted Stock Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       1 year    
Minimum | Employees | Restricted Stock Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       3 years    
Maximum | Employees | Restricted Stock Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       4 years