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Income taxes - Narrative (Details) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Income Tax Disclosure [Abstract] |  |
Deferred tax assets, non-capital operating loss carryforwards | $ 43,882 |
Non-capital losses for income tax purposes | 185,614 |
Valuation allowance, amount | 881 | $ 1,035
Operating loss carryforwards, not subject to expiration | $ 7,664 |

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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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