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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, 2022
Dec. 31, 2021
Statement [line items]    
Balance at beginning of year $ 3,489 $ 3,562
Balance at end of year 3,060 3,489
Defined Benefit Plan    
Statement [line items]    
Balance at beginning of year (22) 116
Recognized during the period (577) (138)
Balance at end of year $ (599) $ (22)