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Stockholder's equity (Details 2)
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Stockholders Equity Details 2    
Expected life (in years) 2 years 10 months 21 days 4 years 2 months 23 days
Weighted average volatility 108.92% 90.14%
Forfeiture rate 14.21% 11.43%
Risk-free interest rate 0.97% 1.14%
Expected dividend rate 0.00% 0.00%