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Related party transactions (Details) - CAD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Corporate Joint Venture |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable |  | $ 1,179 | $ 1,202
Other assets |  | 1,432 | 0
Accounts payable and accrued liabilities |  | $ 5,296 | $ 251
Heavy equipment | Nuna Logistics Partnership |  |  |
Related Party Transaction [Line Items] |  |  |
Purchase of heavy equipment | $ 1,300 |  |

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