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Income taxes - Expiration of non-capital losses for income tax purposes (Details)
$ in Thousands
Dec. 31, 2023
CAD ($)
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 116,143
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 175
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 118
2040  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 82,668
2041  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 16,816
2042  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 3,677
2043  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 3,308