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New Standards And Interpretations - Schedule of Significant Effects of Adopting IFRS 16 (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]      
Right of use assets $ 3,735 $ 3,801 $ 0
Effect of Application of New Standards [Member] | Property, plant and equipment [member]      
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]      
Right of use assets   66  
Effect of Application of New Standards [Member] | Prepayment under Current Assets [Member]      
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]      
Right of use assets   59  
Effect of Application of New Standards [Member] | Prepaid Land Lease Payments under Non-current Assets [Member]      
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]      
Right of use assets   $ 978