Quarterly report pursuant to Section 13 or 15(d)

4. STOCKHOLDERS' EQUITY (Details)

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4. STOCKHOLDERS' EQUITY (Details)
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Compensation expense associated with stock options and other forms of equity compensation assumptions    
Expected Term   6 years 3 months
Expected Term, minimum 5 years 9 months 5 days  
Expected Term, maximum 6 years 3 months  
Volatility, minimum 51.00% 51.00%
Volatility, maximum 52.00% 57.00%
Dividend yield 0.00% 0.00%
Risk-free interest rate, minimum 1.54% 1.49%
Risk-free interest rate, maximum 1.79% 2.14%