Quarterly report pursuant to Section 13 or 15(d)

5. STOCKHOLDERS??? EQUITY (DEFICIT) (Details)

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5. STOCKHOLDERS’ EQUITY (DEFICIT) (Details)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
STOCKHOLDERS' EQUITY (DEFICIT)    
Expected Term, minimum 5 years 9 months 18 days 5 years 9 months 18 days
Expected Term, maximum 6 years 3 months 18 days 6 years 3 months 18 days
Volatility, minimum 58.00% 51.00%
Volatility, maximum 64.00% 52.00%
Dividend yield 0.00% 0.00%
Risk-free interest rate, minimum 1.60% 1.54%
Risk-free interest rate, maximum 2.29% 1.79%