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Financial instruments - Fair values and risk management - Liquidity Risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]      
Weighted average effective interest rate, lease liabilities (%) 9.00% 7.00%  
Weighted average effective interest rate, liabilities for puttable financial instrument (%)   15.00%  
Trade payables $ 3,142 $ 3,668  
Trade payables 3,142 3,668  
Other liabilities 6,927    
Other liabilities 6,927    
Other liabilities   1,828  
Other liabilities   1,828  
Lease liabilities 1,767 5,772  
Lease liabilities 1,876 7,204  
Liabilities for puttable financial instrument 0 14,309 $ 14,623
Liabilities for puttable financial instrument   16,834  
Financial liabilities 11,836 25,577  
Liabilities, undiscounted cash flows 11,945 29,534  
Within 1 year      
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]      
Trade payables 3,142 3,668  
Other liabilities 6,927    
Other liabilities   1,828  
Lease liabilities 1,428 4,034  
Liabilities for puttable financial instrument   16,834  
Liabilities, undiscounted cash flows 11,497 26,364  
After 1 year but within 2 years      
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]      
Trade payables 0 0  
Other liabilities 0    
Other liabilities   0  
Lease liabilities 448 1,805  
Liabilities for puttable financial instrument   0  
Liabilities, undiscounted cash flows 448 1,805  
After 2 years but within 5 years      
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]      
Trade payables 0 0  
Other liabilities 0    
Other liabilities   0  
Lease liabilities 0 1,365  
Liabilities for puttable financial instrument   0  
Liabilities, undiscounted cash flows $ 0 $ 1,365