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Supplemental disclosure of cash flow information (Details Textual) - shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Redeemable Preferred Stock [Member]      
Supplemental Disclosure Of Cash Flow Information [Line Items]      
Stock Issued During Period, Shares, Issued for Services 8,615 5,957 10,180
Stock Issued During Period, Shares, Conversion of Convertible Securities (7,195) (4,756) (4,720)
Common Stock [Member]      
Supplemental Disclosure Of Cash Flow Information [Line Items]      
Stock Issued During Period, Shares, Issued for Services 10,514 18,294 25,111