Stock options, retention securities and warrants - Fair value of options granted (Details) - Y	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Minimum
Stock options, retention securities and warrants
Risk-free interest rate	2.72%	3.02%
Expected term in years	4	5
Expected stock price volatility	146.48%	152.12%
Maximum
Stock options, retention securities and warrants
Risk-free interest rate	3.19%	3.76%
Expected term in years	9.2	10
Expected stock price volatility	170.89%	164.96%

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2025-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2025-03-27

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- Definition

The option life of share options granted.

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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]]

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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.

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No definition available.

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