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Stock based compensation, options and warrants (Schedule of Stock-based Compensation) (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock-based compensation $ 883,943 $ 133,043
Selling, general and administrative expenses [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock-based compensation $ 883,943 $ 133,043