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Share-based payment arrangements - Summary of assumptions used to estimate the fair value of options granted (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Expected dividends | $ 0 | $ 0
Bottom of range |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Risk-free interest rate | 0.30% | 0.30%
Expected volatility (range) | 64.00% | 63.00%
Expected life (range) | 1 year 11 months 1 day | 1 year 11 months 15 days
Top of range |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Risk-free interest rate | 0.80% | 1.00%
Expected volatility (range) | 68.00% | 70.00%
Expected life (range) | 3 years 11 months 4 days | 3 years 11 months 15 days

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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of an expected dividend used to calculate the fair value of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Details
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