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Leases - Summary of Detailed Information about Lease Amounts Reflected in Statement of Profit or Loss (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Detailed Information About Lease Amounts Reflected In Statement Of Profit Or Loss [Abstract]      
Depreciation charge of office buildings $ 1,069 $ 911 $ 1,001
Interest expense (included in finance cost) 696 775 870
Expenses relating to short-term leases     47
Expense relating to leases of low-value assets that are not shown above as short-term leases     23
Total $ 1,765 $ 1,686 $ 1,941