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Income taxes - Current and Deferred Amounts of Provision for Income Taxes Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income taxes      
Current $ 3,853 $ 6,665 $ 9,548
Deferred 1,268 611 450
Total income tax expense $ 5,121 $ 7,276 $ 9,998