Quarterly report pursuant to Section 13 or 15(d)

4. STOCKHOLDERS' EQUITY (Details)

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4. STOCKHOLDERS' EQUITY (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Compensation expense associated with stock options and other forms of equity compensation assumptions      
Expected Term 6 years 3 months 6 years 3 months 6 years 3 months
Volatility     63.00%
Volatility, minimum 51.00% 51.00%  
Volatility, maximum 54.00% 57.00%  
Dividend yield 0.00% 0.00% 0.00%
Risk-free interest rate     2.20%
Risk-free interest rate, minimum 1.75% 1.49%  
Risk-free interest rate, maximum 2.14% 2.14%