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Taxation - Components of corporate tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Taxation      
Current tax on result $ 249 $ 139 $ 61
Deferred tax prior years   18  
Deferred tax current year (7,264) (9,679) (3,921)
Movement in valuation allowance 7,264 9,679 3,903
Total corporate tax $ 249 $ 157 $ 43