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STOCKHOLDERS' EQUITY (Details 1) - Warrants [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average exercise price 5.16 6.83 7.90
Weighted average grant date fair value $ 2.79 $ 3.67 $ 4.78
Risk-free interest rate 2.36% 1.47%  
Risk-free interest rate - minimum     1.04%
Risk-free interest rate - maximum     1.28%
Volatility 62.12% 63.24%  
Volatility - minimum     74.10%
Volatility - maximum     74.15%
Term (in years) 5 years 5 years 5 years
Dividend yield 0.00% 0.00% 0.00%