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Property, plant and equipment - Schedule of Property, plant and equipment (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 25,973,037 $ 23,359,940
Less accumulated depreciation and amortization (2,256,269) (1,556,964)
Property, plant and equipment, net 23,716,768 21,802,976
Land    
Property, Plant and Equipment [Line Items]    
Total property and equipment 704,567 676,083
Building and improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment 9,244,737 9,187,160
Construction in process    
Property, Plant and Equipment [Line Items]    
Total property and equipment 6,091,265 5,119,961
Equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 9,713,030 8,211,510
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 192,606 136,091
Vehicles    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 26,832 $ 29,135