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5. STOCKHOLDERS’ EQUITY (DEFICIT) (Details)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
STOCKHOLDERS' EQUITY    
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 54.00% 51.00%
Volatility, maximum 57.00% 64.00%
Dividend yield 0.00% 0.00%
Risk-free interest rate, minimum 2.40% 1.77%
Risk-free interest rate, maximum 2.59% 2.29%