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Segmented and geographic information, and major customers (Major Customers) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Major Customer One [Member]        
Disclosure of major customers [line items]        
Percentage of revenue 100.00% 86.00% 70.00% 72.00%
Major Customer Two [Member]        
Disclosure of major customers [line items]        
Percentage of revenue   14.00% 30.00% 28.00%