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Summary of material accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Summary Of Material Accounting Policies [Abstract] |
Summary of Ownership Interests in Subsidiaries |
|  |  |  |  |  |  |  | Percentage of Ownership (%)
|  |  |  |  |  |  |  | December 31,
Name of investor |  | Name of investee |  | Main business |  | Location |  | 2022 |  | 2023
The Company |  | ChipMOS U.S.A., Inc. (“ChipMOS USA”) |  | Marketing of semiconductors and electronic related products |  | San Jose, USA |  | 100 |  | 100
The Company |  | ChipMOS TECHNOLOGIES (BVI) LTD. (“ChipMOS BVI”) |  | Holding company |  | British Virgin Islands |  | 100 |  | 100
ChipMOS BVI |  | ChipMOS SEMICONDUCTORS (Shanghai) LTD. (“ChipMOS Shanghai”) |  | Marketing of semiconductors and electronic related products |  | Shanghai, People’s Republic of China (“PRC”) |  | 100 |  | 100
Estimated Useful Life for Depreciation of Individual Assets |
Buildings |  | 1 to 51 years
Machinery and equipment |  | 1 to 20 years
Tools |  | 1 to 4 years
Others |  | 1 to 7 years

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