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STOCK BASED COMPENSATION - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2017
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 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)   2,100,714     2,100,714   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   $ 926,000   $ 697,000 $ 2,700,000 $ 2,200,000  
Fair value of awards vested   0   $ 0 2,500,000 $ 5,700,000  
Unrecognized compensation expense   $ 3,500,000     $ 3,500,000   $ 3,500,000
Restricted stock awards or units granted (in shares)   572,197     572,197   582,940
Period of recognition for unrecognized compensation expense     1 year 7 months 9 days   1 year 9 months 10 days    
RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units vested (in shares)   140,997     140,997   135,059
Forfeited (in shares)         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