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STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Warrants        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense   $ 0 $ 0  
Unvested shares   0    
Performance based restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense   $ 0 200,000  
Restricted stock awards, granted in period   900,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 0.37    
Unvested shares   900,000   129,929
Performance based restricted stock | Years Ended December 31, 2016 - 2018 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense     200,000  
Number of shares vested   231,396    
Performance based restricted stock | Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense   $ 0    
Restricted stock awards, granted in period   900,000    
Award vesting period   3 years    
Grant date fair value of stock units granted   $ 300,000    
Unvested restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense $ 200,000   $ 100,000  
Unrecognized compensation expense, other than options   $ 100,000    
Unrecognized compensation expense, period for recognition   3 months 18 days    
Restricted stock awards, granted in period   200,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 0.37    
Unvested shares   522,269   522,269
Unvested restricted stock | Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense   $ 100,000    
Grant date fair value of stock units granted   $ 100,000    
Number of shares vested   200,000    
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awards, granted in period   400,000 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 0.37    
Unvested shares   755,246   428,309
Restricted Stock Units (RSUs) [Member] | Chief Financial Officer And Former Chief Financial Officer And Chief Executive Officer And Employees And Consultants [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense     $ 300,000  
Unrecognized compensation expense, other than options   $ 300,000    
Unrecognized compensation expense, period for recognition   2 years    
Restricted Stock Units (RSUs) [Member] | Chief Financial Officer And Former Chief Financial Officer And Chief Executive Officer And Employees And Consultants [Member] | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense   $ 100,000    
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awards, granted in period   400,000    
Grant date fair value of stock units granted   $ 100,000    
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member] | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense   100,000    
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense   0 $ 0  
Unrecognized compensation expense, options   $ 0    
Nonvested options   0    
Warrants [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense, other than options   $ 0    
Granted, Options