Quarterly report pursuant to Section 13 or 15(d)

Stock options and warrants (Schedule of Fair Value Assumptions) (Details)

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Stock options and warrants (Schedule of Fair Value Assumptions) (Details) - Stock Incentive Plan [Member]
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividend yield 0.00% 0.00%
Expected price volatility 93.00%  
Expected price volatility, minimum   96.00%
Expected price volatility, maximum   126.00%
Risk free interest rate 1.39%  
Risk free interest rate, minimum   1.52%
Risk free interest rate, maximum   1.74%
Expected term 5 years 5 years