Quarterly report pursuant to Section 13 or 15(d)

12. Derivative Liability (Tables)

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12. Derivative Liability (Tables)
6 Months Ended
Jun. 30, 2017
Derivative Liability Tables  
Assumptions used to determine the fair value of the warrants
    Six months ended June 30,  
    2017     2016  
Stock price ($)     1.45-1.58       1.79-1.84  
Adjusted Exercise price ($)     1.54-1.55       6.25  
Risk-free interest rate (%)     2.23       1.58-1.78  
Expected volatility (%)     64.3-74.4       94.6-96.7  
Time to maturity (years)     1.5-1.75       2.75-3.00