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Income taxes - Expiration of non-capital losses for income tax purposes (Details) $ in Thousands | Dec. 31, 2022 CAD ($)
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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

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