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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, 2017 | Dec. 31, 2016
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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%
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 | $ (1) | $ 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 | 7 | (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 | 718 | 541
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 | 202 | 128
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 | $ 30 | 34
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 |  | $ (6)
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%)
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 | $ 1 | $ (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 | (7) | 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 | (718) | (541)
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 | (202) | (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 | $ (30) | (34)
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 |  | $ 6

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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 2017-01-01 -Paragraph B8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_B8_c&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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