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STOCK-BASED COMPENSATION PLANS (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair value of stock option grants        
Expected term (years) 6 years 3 months 6 years 3 months 6 years 3 months 6 years 3 months
Risk-free interest rate 2.78% 1.82% 2.78% 1.79%
Expected volatility 123.05% 123.85% 123.05% 124.38%
Expected dividend yield 0.00% 0.00% 0.00% 0.00%