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Bank facilities (Details)
Dec. 31, 2018
USD ($)
$ / $
Dec. 31, 2018
CAD ($)
$ / $
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD ($)
Disclosure of detailed information about borrowings [line items]        
Unrealized gain (loss) on forward foreign exchange contracts   $ (777,000)   $ 243,000
Currency risk        
Disclosure of detailed information about borrowings [line items]        
Foreign exchange contracts   $ 17,400,000 $ 12,000,000  
Average price of hedging instrument (CDN per USD) | $ / $ 1.30 1.30    
Operating Facility        
Disclosure of detailed information about borrowings [line items]        
Facility, maximum borrowing capacity   $ 7,000,000    
Borrowings outstanding $ 0   $ 0  
Operating Facility | Prime Rate        
Disclosure of detailed information about borrowings [line items]        
Borrowings, adjustment to interest rate basis 0.50% 0.50%    
Leasing Facility        
Disclosure of detailed information about borrowings [line items]        
Facility, maximum borrowing capacity   $ 1,830,770    
Borrowings outstanding $ 0      
Forward Contract Facility        
Disclosure of detailed information about borrowings [line items]        
Facility, maximum borrowing capacity   5,000,000    
EncoreFX Facility        
Disclosure of detailed information about borrowings [line items]        
Facility, maximum borrowing capacity   $ 30,000,000