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Financial instruments and risk management - Financial instruments (Details) - CAD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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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 | 131,795 | 135,963
Level 2 | Carrying Amount | Financing obligations |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | 32,889 | 47,945
Level 2 | Carrying Amount | Mortgage |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | 29,231 | 30,000
Level 2 | Fair Value | Financing obligations |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | 30,783 | 47,010
Level 2 | Fair Value | Mortgage |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | $ 24,329 | $ 29,756

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