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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