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Property, plant and equipment - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Construction in process $ 26,505,903 $ 25,973,037
Capital Additions | Rollo Bay farm site    
Property, Plant and Equipment [Line Items]    
Amount committed to renovations 828,000  
Construction in process    
Property, Plant and Equipment [Line Items]    
Construction in process 6,545,566 $ 6,091,265
Construction in process | Rollo Bay farm site    
Property, Plant and Equipment [Line Items]    
Construction in process $ 6,000,000