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New Standards And Interpretations - Schedule of Significant Effects of Adopting IFRS 16 (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items] |  |  |  |
Right of use assets | $ 3,248 | $ 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 |

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