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Financial Risk Management Objectives - Summary of Balance of Financial Assets and Liabilities Denominated in a Currency Different from the Company's Reporting Currency (Detail) € in Thousands, ฿ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2020 THB (฿)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 SGD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 HKD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 THB (฿)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 SGD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2019 HKD ($)	Aug. 13, 2014 USD ($)
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets denominated in a currency different	$ 155,632,000							$ 151,492,000
Financial liabilities denominated in a currency different	54,105,000							34,350,000						$ 0
Foreign currency risk [Member] | United States dollar (USD) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets denominated in a currency different	10,025,000							19,263,000
Financial liabilities denominated in a currency different	$ 7,501,000							$ 4,802,000
Foreign currency risk [Member] | Thai Baht (THB) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets denominated in a currency different | ฿		฿ 13,241							฿ 346
Financial liabilities denominated in a currency different | ฿		฿ 30							฿ 87,779
Foreign currency risk [Member] | Singapore dollars (SGD) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets denominated in a currency different				$ 113							$ 233
Financial liabilities denominated in a currency different				$ 6							$ 20
Foreign currency risk [Member] | Taiwan dollar (TWD) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets denominated in a currency different					$ 3,357							$ 9,711
Financial liabilities denominated in a currency different					$ 4,820							$ 7,648
Foreign currency risk [Member] | Renminbi (RMB) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets denominated in a currency different | ¥			¥ 18							¥ 119
Foreign currency risk [Member] | Hong Kong, dollar (HKD) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets denominated in a currency different						$ 8,017							$ 7,526
Financial liabilities denominated in a currency different						$ 28							$ 83
Foreign currency risk [Member] | Euro (EUR) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets denominated in a currency different | €							€ 249
Financial liabilities denominated in a currency different | €							€ 413

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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