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Others - Financial instruments, schedule of significant financial assets and liabilities denominated in foreign currencies (Details) € in Thousands, ¥ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2023 JPY (¥)	Dec. 31, 2022 TWD ($)	Dec. 31, 2022 EUR (€)	Dec. 31, 2022 JPY (¥)	Dec. 31, 2022 CNY (¥)
Financial instruments
Currency Amount, Assets	$ 161,646	$ 200,811
Currency Amount, Liabilities	10,406	9,396
Foreign exchange gains (losses)	34	1,303	$ (893)
Foreign exchange risk | USD:NTD
Financial instruments
Currency Amount, Assets		22,660					$ 695,889
Currency Amount, Liabilities		$ 2,620					$ 80,460
Exchange rate		30.71					30.71	30.71	30.71	30.71
Degree of Variation, Assets		1.00%
Degree of Variation, Liabilities		1.00%
Effect on profit or loss, Assets		$ 227
Effect on profit or loss, Liabilities		26
Foreign exchange risk | EUR:NTD
Financial instruments
Currency Amount, Assets		$ 888					$ 27,256	€ 833
Exchange rate		32.72					32.72	32.72	32.72	32.72
Degree of Variation, Assets		1.00%
Effect on profit or loss, Assets		$ 9
Foreign exchange risk | JPY:NTD
Financial instruments
Currency Amount, Assets		$ 3,271					$ 100,454		¥ 436,755
Exchange rate		0.23					0.23	0.23	0.23	0.23
Degree of Variation, Assets		1.00%
Effect on profit or loss, Assets		$ 33
Foreign exchange risk | USD:JPY
Financial instruments
Currency Amount, Liabilities	$ 168	$ 221				¥ 23,754			¥ 29,203
Exchange rate	141.39	132.14		141.39	141.39	141.39	132.14	132.14	132.14	132.14
Degree of Variation, Liabilities	1.00%	1.00%
Effect on profit or loss, Liabilities	$ 2	$ 2
Foreign exchange risk | USD:RMB
Financial instruments
Currency Amount, Liabilities		$ 65								¥ 453
Exchange rate		6.97					6.97	6.97	6.97	6.97
Degree of Variation, Liabilities		1.00%
Effect on profit or loss, Liabilities		$ 1
Foreign exchange risk | NTD:USD
Financial instruments
Currency Amount, Assets	$ 2,579			$ 79,097
Exchange rate	0.0326			0.0326	0.0326	0.0326
Degree of Variation, Assets	1.00%
Effect on profit or loss, Assets	$ 26
Foreign exchange risk | EUR:USD
Financial instruments
Currency Amount, Assets	735				€ 664
Currency Amount, Liabilities	$ 153				€ 138
Exchange rate	1.1064			1.1064	1.1064	1.1064
Degree of Variation, Assets	1.00%
Degree of Variation, Liabilities	1.00%
Effect on profit or loss, Assets	$ 7
Effect on profit or loss, Liabilities	2
Foreign exchange risk | JPY:USD
Financial instruments
Currency Amount, Assets	$ 2,252					¥ 317,217
Exchange rate	0.0071			0.0071	0.0071	0.0071
Degree of Variation, Assets	1.00%
Effect on profit or loss, Assets	$ 23

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The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

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