Quarterly report pursuant to Section 13 or 15(d)

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

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5. STOCKHOLDERS’ EQUITY (DEFICIT) (Details)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
STOCKHOLDERS' EQUITY    
Expected Term 6 years 3 months 18 days  
Expected Term, minimum   5 years 9 months 18 days
Expected Term, maximum   6 years 3 months 18 days
Volatility 57.00% 64.00%
Dividend yield 0.00% 0.00%
Risk-free interest rate 2.59% 2.29%