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Employee benefits - Remeasurement of net defined benefit liability recognized in other comprehensive income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Statement [line items]    
Balance at beginning of year $ 3,060 $ 3,489
Balance at end of year 3,114 3,060
Defined Benefit Plan    
Statement [line items]    
Balance at beginning of year (599) (22)
Recognized during the period (11) (577)
Balance at end of year $ (610) $ (599)