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Property, plant and equipment - Schedule of property, plant and equipment (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 25,370,594 $ 23,359,940
Less accumulated depreciation and amortization (1,752,893) (1,556,964)
Property, plant and equipment, net 23,617,701 21,802,976
Land    
Property, Plant and Equipment [Line Items]    
Total property and equipment 714,785 676,083
Building and improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment 9,316,101 9,187,160
Construction in process    
Property, Plant and Equipment [Line Items]    
Total property and equipment 5,562,148 5,119,961
Equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 9,558,732 8,211,510
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 190,998 136,091
Vehicles    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 27,830 $ 29,135