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Stockholder's equity (Details 2)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Stockholders Equity Details 2    
Expected life (in years) 2 years 10 months 13 days 2 years 8 months 26 days
Weighted average volatility 108.81% 126.09%
Forfeiture rate 13.58% 17.49%
Risk-free interest rate 0.96% 0.96%
Expected dividend rate 0.00% 0.00%