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Stockholders' equity (Details 1)
9 Months Ended
Sep. 30, 2014
Stockholders' Equity Note [Abstract]  
Expected life (in years) 4 years 2 months 23 days
Weighted average volatility 90.14%
Forfeiture rate 11.43%
Risk-free interest rate 1.41%
Expected dividend rate 0.00%