Annual report pursuant to Section 13 and 15(d)

4. Stock-Based Compensation (Details 1)

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4. Stock-Based Compensation (Details 1)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Stock-based Compensation Details 1    
Dividend yield (%) 0.00% 0.00%
Expected volatility (%) 132.99% 106.20%
Average Risk-free interest rate (%)   1.97%
Average Risk-free interest rate (%), minimum 1.78%  
Average Risk-free interest rate (%), maximum 2.25%  
Expected life of stock option term (years) 8 years 5 months 5 days 7 years 9 months 22 days