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Stockholders' equity (Details 4)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Expected life (in years) 4 years 11 months 29 days 4 years 3 months 29 days 4 years 15 days
Weighted average volatility 90.07% 93.89% 89.17%
Forfeiture rate 0.00% 0.00% 0.00%
Risk-free interest rate 1.41% 0.74% 0.54%
Expected dividend rate 0.00% 0.00% 0.00%