Quarterly report pursuant to Section 13 or 15(d)

7. STOCKHOLDERS' EQUITY (Details 2)

v3.19.3
7. STOCKHOLDERS' EQUITY (Details 2)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dividend yield 0.00% 0.00%
Discount due to lack of marketability 20.00% 20.00%
Minimum    
Risk-free interest rate 1.77% 2.15%
Expected volatility of common stock 80.00% 97.00%
Expected life of warrant in years 3 years 2 years 9 months
Maximum    
Risk-free interest rate 2.46% 2.83%
Expected volatility of common stock 107.00% 119.00%
Expected life of warrant in years 5 years 5 years