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Income taxes - Expiration of non-capital losses for income tax purposes (Details) $ in Thousands | Dec. 31, 2019 CAD ($)
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Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | $ 185,614
2027 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 279
2032 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 5,099
2033 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 5,893
2034 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 3,531
2036 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 3,127
2037 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 18,955
2038 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 86,189
2039 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | $ 62,541

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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