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Related parties - Key management compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Related parties      
Short term employee benefits $ 2,673 $ 3,099 $ 1,518
Share-based payments 1,994 2,702 310
Post-employment benefits 108 92 74
Total key management compensation $ 4,775 $ 5,893 $ 1,902