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Income taxes - Unrecognized deferred income tax (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total unrecognized deductible temporary differences $ 63,960 $ 91,039
Non-capital loss carry forwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total unrecognized deductible temporary differences 49,299 72,669
Other deductible temporary differences    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Total unrecognized deductible temporary differences $ 14,661 $ 18,370