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Income taxes - Expiration of non-capital losses for income tax purposes (Details) $ in Thousands | Dec. 31, 2018 CAD ($)
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Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | $ 86,826
2025 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 2
2026 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 151
2027 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 128
2031 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 605
2032 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 6,409
2033 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 5,893
2034 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 5,200
2036 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 2,207
2037 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 17,922
2038 |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | $ 48,309

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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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