Quarterly report pursuant to Section 13 or 15(d)

Stock options and warrants (Schedule of Stock-based Compensation) (Details)

v3.3.0.814
Stock options and warrants (Schedule of Stock-based Compensation) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based compensation $ 238,084 $ 214,074 $ 1,019,067 $ 943,486
Selling, general and administrative expenses [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based compensation 214,848 201,543 910,854 889,888
Research and development expenses [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based compensation $ 23,236 $ 12,531 $ 108,213 $ 53,598