Quarterly report pursuant to Section 13 or 15(d)

Description of business and summary of significant accounting policies - Property, Plant and Equipment (Details)

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Description of business and summary of significant accounting policies - Property, Plant and Equipment (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Property, Plant and Equipment [Line Items]        
Depreciation $ 42,366 $ 28,716 $ 129,775 $ 148,108
Minimum        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, estimated useful lives     3 years  
Maximum        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, estimated useful lives     15 years