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Income taxes - Expiration of non-capital losses for income tax purposes (Details) $ in Thousands | Dec. 31, 2020 CAD ($)
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Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | $ 175,507
2026 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 279
2031 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 179
2032 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 4,672
2033 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 5,893
2034 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 819
2036 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 3,125
2037 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 17,799
2038 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 86,979
2039 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 39,470
2040 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | $ 16,292

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