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
Mar. 31, 2017
Mar. 31, 2016
Property, Plant and Equipment [Line Items]    
Depreciation $ 39,453 $ 41,166
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