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Summary of significant accounting policies (Details)
9 Months Ended
Sep. 30, 2015
Buildings [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 20 years
Machinery and equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 10 years
Furniture and fixtures [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 10 years
Office equipment and software [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 5 years
Vehicles [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 5 years