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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 |  |
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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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