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STOCKHOLDERS' EQUITY (Details) - Stock Options [Member]
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate - minimum   2.38%
Risk-free interest rate - maximum   2.60%
Risk-free interest rate 2.54%  
Volatility - minimum   63.59%
Volatility - maximum   64.04%
Volatility 61.85%  
Term 6 years 3 months  
Dividend yield 0.00% 0.00%
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Term   6 years
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Term   6 years 3 months