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Financial Instruments - Currency risk (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
NTD [Member] | Financial liabilities [Member]
IFRS Statement [Line Items]
Foreign currency	$ 1,084,594	$ 897,593
Exchange rate	28.480	29.980
Functional currency	$ 38,083	$ 29,939
NTD [Member] | Financial assets [Member]
IFRS Statement [Line Items]
Foreign currency	$ 155,418	$ 148,825
Exchange rate	28.480	29.980
Functional currency	$ 5,457	$ 4,964
CNY [Member] | Financial assets [Member]
IFRS Statement [Line Items]
Foreign currency	$ 35,630	$ 34,726
Exchange rate	6.5428	6.9762
Functional currency	$ 5,461	$ 4,978
JPY [Member] | Financial liabilities [Member]
IFRS Statement [Line Items]
Foreign currency	$ 632,215	$ 3,099
Exchange rate	103.0786	108.6232
Functional currency	$ 6,133	$ 29

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- Definition

Amount represents the functional currency

+ References

No definition available.

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- Definition

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- 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
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-IssueDate 2020-01-01
-Paragraph 112
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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
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-IssueDate 2020-01-01
-Paragraph 52
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