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Financial instruments and risk management - Financial instruments (Details) - CAD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Level 1 | Carrying Amount | Convertible debentures
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt	$ 55,000	$ 94,031
Level 1 | Fair Value | Convertible debentures
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt	52,250	112,970
Level 2 | Carrying Amount | Financing obligations
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt	51,118	15,435
Level 2 | Fair Value | Financing obligations
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt	$ 49,938	$ 13,647

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

+ Details

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- References

No definition available.

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