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Financial instruments - Fair values and risk management - Expected credit loss assessment (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Allowance for impairment      
Disclosure of detailed information about financial instruments [line items]      
Allowance account for credit losses of financial assets $ 566 $ 740 $ 2,424
Allowance for impairment | Lifetime expected credit losses      
Disclosure of detailed information about financial instruments [line items]      
Allowance account for credit losses of financial assets $ 3,544    
Performing      
Disclosure of detailed information about financial instruments [line items]      
Average loss rate 0.00%    
Performing | Allowance for impairment | Lifetime expected credit losses      
Disclosure of detailed information about financial instruments [line items]      
Allowance account for credit losses of financial assets $ 2,562    
Doubtful      
Disclosure of detailed information about financial instruments [line items]      
Average loss rate 1.00%    
Doubtful | Allowance for impairment | Lifetime expected credit losses      
Disclosure of detailed information about financial instruments [line items]      
Allowance account for credit losses of financial assets $ 414    
In default      
Disclosure of detailed information about financial instruments [line items]      
Average loss rate 13.00%    
In default | Allowance for impairment | Lifetime expected credit losses      
Disclosure of detailed information about financial instruments [line items]      
Allowance account for credit losses of financial assets $ 18    
Write-off      
Disclosure of detailed information about financial instruments [line items]      
Average loss rate 100.00%    
Write-off | Allowance for impairment | Lifetime expected credit losses      
Disclosure of detailed information about financial instruments [line items]      
Allowance account for credit losses of financial assets $ 550