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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Net Defined Benefit Liability Asset [Abstract]      
Current service cost $ 546 $ 419 $ 360
Past service cost 121    
Interest cost on benefit obligation 254 202 210
Net benefit cost 921 621 570
Actuarial (gain) / loss - experience 494 396 251
Actuarial (gain) / loss - demographic assumption 18 1 184
Actuarial (gain) / loss - financial assumption 1,215 13 337
Re-measuring gain/(loss) on defined benefit plans 1,727 410 772
Defined benefit obligation at January 1 9,016 8,293 6,652
Benefits paid directly by the Company (535) (352) (274)
Exchange differences 613 44 573
Defined benefit obligation at December 31 $ 11,742 $ 9,016 $ 8,293