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Financial Instruments - Currency risk (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
NTD [Member] | Financial liabilities [Member]
IFRS Statement [Line Items]
Foreign currency	$ 897,593	$ 922,148
Exchange rate	29.980	30.715
Functional currency	$ 29,939	$ 30,023
NTD [Member] | Financial assets [Member]
IFRS Statement [Line Items]
Foreign currency	$ 148,825	$ 205,394
Exchange rate	29.980	30.715
Functional currency	$ 4,964	$ 6,687
CNY [Member] | Financial assets [Member]
IFRS Statement [Line Items]
Foreign currency	$ 34,726	$ 33,590
Exchange rate	6.9762	6.8681
Functional currency	$ 4,978	$ 4,891

X

- Definition

Amount represents the functional currency

+ References

No definition available.

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- Definition

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+ References

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X

- Definition

The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

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- Definition

The net gain arising from foreign exchange differences. [Refer: Foreign exchange gain (loss)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 21
-IssueDate 2019-01-01
-Paragraph 52
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=21&code=ifrs-tx-2019-en-r&anchor=para_52_a&doctype=Standard
-URIDate 2019-03-27

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