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STOCK OPTIONS - SUMMARY OF NONVESTED STOCK OPTIONS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]      
Number of Options Non-vested at beginning of period (in shares) 2,232,435    
Number of Options Non-vested, Granted (in shares) 225,000 1,728,000 810,762
Number of Options Non-vested, Vested (in shares) (880,474)    
Number of Options Non-vested, Forfeited (in shares) (225,841)    
Number of Options Non-vested at end of period (in shares) 1,351,120 2,232,435  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted average grant date fair value, Non-vested Options at beginning of period (in dollars per share) $ 1.40    
Weighted average grant date fair value, Non-vested Options, Granted (in dollars per share) 2.40    
Weighted average grant date fair value, Non-vested Options, Vested (in dollars per share) 1.63    
Weighted average grant date fair value, Non-vested Options, Forfeited (in dollars per share) 2.10    
Weighted average grant date fair value, Non-vested Options at end of period (in dollars per share) $ 1.48 $ 1.40