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Financial Risk Management Objectives - Sensitivity of Profit Before Tax and Equity to a Reasonably Possible Change of Each Foreign Currency Exchange Rates (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
5% increase in rate [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Percentage of change of foreign currency exchange rates	5.00%	5.00%
Change in profit before tax due to change of foreign currency exchange rates	$ 723	$ (210)
5% increase in rate [Member] | Thai Baht (THB) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates	(147)
5% increase in rate [Member] | Singapore dollars (SGD) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates	8	4
5% increase in rate [Member] | Taiwan dollar (TWD) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates	3	1
5% increase in rate [Member] | Renminbi (RMB) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates	1	(1)
5% increase in rate [Member] | Hong Kong, dollar (HKD) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates	$ 48	127
5% increase in rate [Member] | Australian dollar (AUD) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates		2
5% increase in rate [Member] | Japanese yen (JPY) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates		(7)
5% increase in rate [Member] | Euro (EUR) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates		$ (11)
5% decrease in rate [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Percentage of change of foreign currency exchange rates	(5.00%)	(5.00%)
Change in profit before tax due to change of foreign currency exchange rates	$ (723)	$ 210
5% decrease in rate [Member] | Thai Baht (THB) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates	147
5% decrease in rate [Member] | Singapore dollars (SGD) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates	(8)	(4)
5% decrease in rate [Member] | Taiwan dollar (TWD) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates	(3)	(1)
5% decrease in rate [Member] | Renminbi (RMB) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates	(1)	1
5% decrease in rate [Member] | Hong Kong, dollar (HKD) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates	$ (48)	(127)
5% decrease in rate [Member] | Australian dollar (AUD) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates		(2)
5% decrease in rate [Member] | Japanese yen (JPY) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates		7
5% decrease in rate [Member] | Euro (EUR) [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Change in profit before tax due to change of foreign currency exchange rates		$ 11

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- Definition

Risk exposure associated with instruments sharing characteristic, percentage change in risk.

+ References

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

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- Definition

The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph B8
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_B8_c&doctype=Appendix&subtype=B
-URIDate 2019-03-27

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