Annual report pursuant to Section 13 and 15(d)

17. Derivative Liability (Details)

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17. Derivative Liability (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Risk-free interest rate (%)   1.97%
Expected volatility (%) 132.99% 106.20%
Time to maturity (years) 8 years 5 months 5 days 7 years 9 months 22 days
Warrant [Member]    
Stock price ($) $ 3.26 $ 3.15
Exercise price ($) $ 6.25  
Expected volatility (%) 132.99% 106.20%
Warrant [Member] | Minimum [Member]    
Exercise price ($)   $ 0
Risk-free interest rate (%) 1.78% 1.97%
Time to maturity (years) 3 years 7 years 9 months 29 days
Warrant [Member] | Maximum [Member]    
Exercise price ($)   $ 6.25
Risk-free interest rate (%) 2.25% 2.52%
Time to maturity (years) 4 years 9 years