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Long-term debt - Convertible debentures (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 CAD ($) $ / shares | Dec. 31, 2022 CAD ($) | Jun. 01, 2021 CAD ($) | Jun. 01, 2021 $ / shares | Mar. 20, 2019 CAD ($) | Mar. 20, 2019 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issuance costs | $ 3,514 | $ 4,371 |  |  |  |
Convertible debentures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross | $ 129,750 | 129,750 |  |  |  |
Redemption price as a percentage of the principal amount | 101.00% |  |  |  |  |
Convertible debentures | 5.50% convertible debentures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross | $ 74,750 | 74,750 |  |  |  |
Interest rate | 5.50% |  | 5.50% |  |  |
Conversion price (in CAD per share) | (per share) | $ 0.192 |  |  | $ 24.50 |  |
Debt issuance costs |  |  | $ 3,531 |  |  |
Redemption price as a percentage of the principal amount | 125.00% |  |  |  |  |
Convertible debentures | 5.00% convertible debentures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross | $ 55,000 | $ 55,000 |  |  |  |
Interest rate | 5.00% |  |  |  | 5.00% |
Conversion price (in CAD per share) | (per share) | $ 0.12 |  |  |  |  | $ 25.60
Debt issuance costs |  |  |  |  | $ 2,691 |

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