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Long-Term Borrowings - Long-Term Borrowings (Details) - USD ($) $ in Thousands | Sep. 02, 2020 | Dec. 31, 2024 | Dec. 31, 2023 | Aug. 04, 2020
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Chang Hwa Bank |  |  |  |
Long-Term Borrowings |  |  |  |
Unsecured borrowings | $ 20,000 |  |  | $ 40,000
Debt instrument term | 10 years |  |  |
Long-term unsecured borrowings (including current portion) |  |  |  |
Long-Term Borrowings |  |  |  |
Unsecured borrowings |  | $ 34,500 | $ 40,500 |
Pledged collateral amount |  | $ 59,964 | $ 63,352 |

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