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Income taxes - Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Income Taxes [Abstract]
Net loss before income taxes (from continuing operations)	$ (323,409)	$ (144,052)
Expected tax recovery at 27.00% (2023 – 27.00%)	(87,320)	(38,894)
Increase (reduction) in income taxes resulting from:
Non-deductible expenses (non-taxable income)	53,847	(993)
Expiry of losses and ITC	310	96
Investment tax credits earned	(4,703)	(4,009)
Foreign tax rate and tax rate differences	3,415	4,165
Change in unrecognized deductible temporary differences	34,514	39,674
Other	58	119
Total income tax expense from continuing operations	$ 121	$ 158

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The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)]

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The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to foreign tax rates. [Refer: Accounting profit]

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