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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options granted in period (in shares)     296,450 442,956 738,893  
Number of options (in shares)     1,487,433 1,732,754 2,028,847 2,045,143
Outstanding options, weighted average exercise price (in dollars per share)     $ 3.43 $ 3.84 $ 4.48 $ 5.69
Number of exercises in period (in shares)     54,805 355,092 0  
Shares issued for consulting services     $ 146,000 $ 764,000 $ 370,000  
Grants in period, weighted average exercise price (in dollars per share)     $ 2.92 $ 1.75 $ 2.34  
Stock Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, shares authorized (in shares)     10,073,588.9      
Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     2 years      
Award exercise period     5 years      
Exercisable options, weighted average remaining contractual term     2 years 11 months 26 days      
Stock options granted in period (in shares)     300,000 420,000 740,000  
Number of options (in shares)     1,490,000      
Number of exercisable options (in shares)     1,260,000      
Options, vested and expected to Vest, aggregate intrinsic value     $ 52,085      
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     3 years      
Number of exercises in period (in shares)     54,805 355,092 0  
Exercisable options, weighted average exercise price (in dollars per share)     $ 2.27 $ 2.15    
Shares issued for consulting services     $ 70,000 $ 760,000    
Exercisable options, intrinsic value     $ 50,000 $ 410,000    
Number of RSUs granted in period (in shares)     730,000 1,190,000 1,390,000  
Grants in period, grant date intrinsic value (in dollars per share)     $ 2,510,000 $ 1,486,126 $ 1,693,303  
Unrecognized compensation costs related to unvested stock options     $ 40,000      
Unrecognized compensation costs related to RSU awards     880,000      
Recognition period for unrecognized compensation costs 2 years          
Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period 5 years          
Stock options granted in period (in shares) 2,200,000 0        
Grants in period, weighted average exercise price (in dollars per share) $ 1.25          
Unrecognized compensation costs related to RSU awards     $ 1,380,000      
Maximum | Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercisable options, weighted average remaining contractual term     10 years      
Outstanding options, weighted average exercise price (in dollars per share)     $ 3.60      
Minimum | Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Outstanding options, weighted average exercise price (in dollars per share)     $ 3.43      
Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of exercises in period (in shares)         206,612  
Shares issued for consulting services     $ 146,000 $ 764,000 $ 370,000  
Common Stock | Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in period, weighted average exercise price (in dollars per share) 2.92          
Share-based Compensation Award, Tranche One | Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in period, weighted average exercise price (in dollars per share) $ 5.00          
Exercised in period (in shares) 90 days          
Share-based Compensation Award, Tranche Two | Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in period, weighted average exercise price (in dollars per share) $ 7.00          
Exercised in period (in shares) 90 days          
Share-based Compensation Award, Tranche Three | Stock Appreciation Rights (SARs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants in period, weighted average exercise price (in dollars per share) $ 10.00