Quarterly report pursuant to Section 13 or 15(d)

4. STOCKHOLDERS' EQUITY (Details)

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4. STOCKHOLDERS' EQUITY (Details)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Compensation expense associated with stock options and other forms of equity compensation assumptions    
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 52.00%  
Volatility, minimum   56.00%
Volatility, maximum   57.00%
Dividend yield 0.00% 0.00%
Risk-free interest rate, minimum 1.75% 1.49%
Risk-free interest rate, maximum 1.79% 1.90%