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Income taxes - Expiration of non-capital losses for income tax purposes (Details) $ in Thousands	Dec. 31, 2020 CAD ($)
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

X

- 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

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