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STOCK-BASED COMPENSATION, Non-nested, Service-based Restricted Stock and RSU Awards (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Service-based Restricted Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 200,000   $ 400,000  
Service-based Restricted Stock Awards [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   $ 100,000   $ 100,000
Service-based Restricted Stock and RSU Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
2019 404,977   404,977  
2020 777,537   777,537  
2021 758,325   758,325  
2022 721,284   721,284  
2023 509,910   509,910  
Unrecognized compensation cost $ 3,172,033   3,172,033  
Performance Based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense     $ 0  
Restricted Stock and RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares vested (in shares)     1,408 16,648