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Other income (expenses), net (Tables) | 12 Months Ended
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Dec. 31, 2021
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Summary of Other Income (Expenses), Net |
|  | Year ended December 31, |
|  | 2019 |  |  | 2020 |  |  | 2021 |
|  | NT$000 |  |  | NT$000 |  |  | NT$000 |
Gain on disposal of scrapped materials |  |  | 43,652 |  |  |  | 51,077 |  |  |  | 52,254 |
Royalty income |  |  | 12,336 |  |  |  | 2,962 |  |  |  | 907 |
Gain on disposal of items purchased on behalf of others |  |  | 15,080 |  |  |  | 30,140 |  |  |  | 21,945 |
Gain on disposal of property, plant and equipment, net |  |  | 20,271 |  |  |  | 48,070 |  |  |  | 33,935 |
Insurance compensation income |  |  | 10,435 |  |  |  | — |  |  |  | — |
Impairment loss on property, plant and equipment |  |  | (9,938 | ) |  |  | — |  |  |  | (4,843 | )
Gains from lease modifications |  |  | — |  |  |  | — |  |  |  | 891 |
Others |  |  | 1,092 |  |  |  | 3,329 |  |  |  | 20,498 |
|  |  | 92,928 |  |  |  | 135,578 |  |  |  | 125,587 |

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