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Taxation - Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]    
United States $ 474 $ 253
United Kingdom 0 0
Total current tax expense 474 253
United States 0 0
United Kingdom 0 0
Total deferred tax expense 0 0
Total income tax expense $ 474 $ 253