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Financial instruments and risk management - Financial instruments (Details) - CAD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Level 1 | Carrying Amount | Convertible debentures |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | $ 129,750 | $ 129,750
Level 1 | Fair Value | Convertible debentures |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | 160,072 | 131,795
Level 2 | Carrying Amount | Financing obligations |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | 162,266 | 32,889
Level 2 | Carrying Amount | Mortgage |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | 28,429 | 29,231
Level 2 | Fair Value | Financing obligations |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | 159,900 | 30,783
Level 2 | Fair Value | Mortgage |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | $ 22,780 | $ 24,329

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