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Income tax - Summary of Current and Deferred Tax (Expenses) Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current income tax expense      
Current year $ (215) $ (310) $ 0
Uncertain tax positions (40) 328 (110)
Total current income tax expense (255) 18 (110)
Deferred income tax (expense) benefit      
Origination and reversal of temporary differences (231) 118 (58)
Total deferred income tax (expense) benefit (231) 118 (58)
Total income tax (expense) benefit $ (486) $ 136 $ (168)