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Short-term bank loans (Tables) | 12 Months Ended
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Dec. 31, 2021
Short Term Borrowings Abstract [Abstract] |
Summary of Short-term bank loans |
Type of loans |  | December 31, 2020 |  |  | December 31, 2021 |
|  | NT$000 |  |  | NT$000 |
Bank loans |  |  |  |  |  |  |  |
Unsecured bank loans |  |  | — |  |  |  | 731,751 |
Interest rate range |  |  | — |  |  |  | 0.6604%~0.7394 | %
Unused credit lines of short-term bank loans |  |  |  |  |  |  |  |
NT$000 |  |  | 3,251,000 |  |  |  | 2,918,249 |
US$000 |  |  | 90,000 |  |  |  | 85,025 |

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