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Other current and non-current non-financial assets - Conciliation of Explorations in Execution (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Current And Non-Current Non-Financial Assets      
Opening balance   $ 3,699 $ 1,000
Disbursements $ 6,095 4,227  
Reclassifications (732) (1,528)  
Total changes 5,363 2,699  
Total $ 9,062 $ 3,699