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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, 2018	Dec. 31, 2017
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	$ (210)	$ (1,603)
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	4	(1)
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	1	7
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)	718
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	127	202
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	$ 30
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	$ 210	$ 1,603
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	(4)	1
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	(1)	(7)
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	(718)
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	(127)	(202)
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)	$ (30)
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 2018-01-01
-Paragraph B8
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_B8_c&doctype=Appendix&seq=2
-URIDate 2018-03-16

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