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Employee Benefit - Summary of Components of Net Benefit Expense Recognized in Income Statement and Funded Status and Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Net Defined Benefit Liability Asset [Abstract]      
Current service cost $ 519 $ 562 $ 546
Past service cost     121
Interest cost on benefit obligation 127 147 254
Net benefit cost 646 709 921
Actuarial (gain) / loss - experience 140 (328) 494
Actuarial (gain) / loss - demographic assumption (23) (1) 18
Actuarial (gain) / loss - financial assumption (676) 130 1,215
Re-measuring gain/(loss) on defined benefit plans (559) (199) 1,727
Defined benefit obligation at January 1 11,300 11,742 9,016
Benefits paid directly by the Company (746) (954) (535)
Exchange differences (787) 2 613
Defined benefit obligation at December 31 $ 9,854 $ 11,300 $ 11,742