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Related-party Transactions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement [line items]      
Sales of goods $ 65 $ 119 $ 215
Revenue from miscellaneous service 92 78 190
Miscellaneous fee 11 458 496
Other receivable 13 66  
Other payable   110  
Current receivables due from related parties 13 69  
Cheng Mei Materials Technology Corporation      
Statement [line items]      
Purchase of raw materials   1,258 1,079
Accounts payable   911  
Miscellaneous fee   458 496
Associates [member]      
Statement [line items]      
Sales of goods 54 8  
Revenue from miscellaneous service 92 78 181
Miscellaneous fee 11    
Other receivable 13 12  
Viewsil Microelectronics (Kunshan) Limited      
Statement [line items]      
Technical service fee   1,140 1,050
Other related parties      
Statement [line items]      
Sales of goods 11 111 215
Accounts receivable $ 31 14  
Revenue from miscellaneous service     9
Other receivable   54  
Other payable   $ 110  
VST      
Statement [line items]      
Current receivables due from related parties     $ 1,200