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Investment Properties - Reconciliation of Net Book Value of Investment Properties (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation Of Changes In Investment Property [Abstract]    
Net book value at January 1 $ 763 $ 653
Depreciation (included in administrative expenses) (35) (35)
Addition   84
Exchange difference (8) 61
Net book value at December 31 $ 720 $ 763