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Related-party Transactions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Statement [line items] |  |  |
Sales of goods | $ 119 | $ 215 | $ 125
Purchase of raw materials | 1,258 | 1,079 | 3,532
Revenue from miscellaneous service | 78 | 190 | 66
Miscellaneous fee | 458 | 496 | 795
Other receivable | 66 | 24 |
Other payable | 110 | 2,568 |
Current receivables due from related parties | 69 | 1,224 |
Cheng Mei Materials Technology Corporation |  |  |
Statement [line items] |  |  |
Purchase of raw materials | 1,258 | 1,079 | 3,469
Accounts payable | 911 | 263 |
Miscellaneous fee | 458 | 496 | 791
Associates [member] |  |  |
Statement [line items] |  |  |
Sales of goods | 8 |  |
Revenue from miscellaneous service | 78 | 181 | 63
Miscellaneous fee |  |  | 4
Other receivable | 12 | 24 |
Viewsil Microelectronics (Kunshan) Limited |  |  |
Statement [line items] |  |  |
Technical service fee | 1,140 | 1,050 | 1,400
Other payable |  | 2,450 |
Other related parties |  |  |
Statement [line items] |  |  |
Sales of goods | 111 | 215 | 125
Accounts receivable | 14 | 36 |
Purchase of raw materials |  |  | 63
Revenue from miscellaneous service |  | 9 | $ 3
Other receivable | 54 |  |
Other payable | $ 110 | 118 |
VST |  |  |
Statement [line items] |  |  |
Current receivables due from related parties |  | $ 1,200 |

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