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Income taxes - Expiration of non-capital losses for income tax purposes (Details)
$ in Thousands
Dec. 31, 2022
CAD ($)
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 146,217
2026  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 3
2027  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 278
2032  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 176
2033  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 9,095
2037  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 5
2039  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 146
2040  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 112,450
2041  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 16,816
2042  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 7,248