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Related-party Transactions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement [line items]      
Sales of goods $ 215 $ 125 $ 0
Purchase of raw materials 1,079 3,532 689
Accounts payable 263 265  
Revenue from miscellaneous service 190 66  
Miscellaneous fee 496 795 84
Other receivable 24 17  
Other payable 2,568 1,641  
Current receivables due from related parties 1,224 1,217  
Cheng Mei Materials Technology Corporation      
Statement [line items]      
Purchase of raw materials 1,079 3,469 663
Accounts payable 263 233  
Miscellaneous fee 496 791 84
Associates [member]      
Statement [line items]      
Revenue from miscellaneous service 181 63  
Miscellaneous fee   4  
Other receivable 24 14  
Viewsil Microelectronics (Kunshan) Limited      
Statement [line items]      
Technical service fee 1,050 1,400 1,400
Other payable 2,450 1,400  
Other related parties      
Statement [line items]      
Sales of goods 215 125  
Accounts receivable 36 71  
Purchase of raw materials   63 $ 26
Accounts payable   32  
Revenue from miscellaneous service 9 3  
Other receivable   3  
Other payable 118 241  
VST      
Statement [line items]      
Current receivables due from related parties $ 1,200 $ 1,200