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Investment Properties - Reconciliation of Net Book Value of Investment Properties (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation Of Changes In Investment Property [Abstract]    
Net book value at January 1 $ 730 $ 720
Addition 5,197  
Depreciation (included in administrative expenses) (144) (33)
Transfer from property plant and equipment 7  
Exchange difference 588 43
Net book value at December 31 $ 6,378 $ 730