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Property, plant and equipment - Schedule of property, plant and equipment (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 26,505,903 $ 25,973,037
Less accumulated depreciation and amortization (2,571,278) (2,256,269)
Property, plant and equipment, net 23,934,625 23,716,768
Land    
Property, Plant and Equipment [Line Items]    
Total property and equipment 711,336 704,567
Building and improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment 9,284,732 9,244,737
Construction in process    
Property, Plant and Equipment [Line Items]    
Total property and equipment 6,545,566 6,091,265
Equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 9,743,545 9,713,030
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 193,333 192,606
Vehicles    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 27,391 $ 26,832