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Income taxes - Expiration of non-capital losses for income tax purposes (Details)
$ in Thousands
Dec. 31, 2018
CAD ($)
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 86,826
2025  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 2
2026  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 151
2027  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 128
2031  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 605
2032  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 6,409
2033  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 5,893
2034  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 5,200
2036  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 2,207
2037  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 17,922
2038  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 48,309