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Net Operating Loss Carryforwards available to Offset Future Taxable Income (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Operating Loss Carryforwards [Line Items]  
Amount $ 48,935
Hong Kong  
Operating Loss Carryforwards [Line Items]  
Amount $ 15,521
Expiring year indefinite
Taiwan  
Operating Loss Carryforwards [Line Items]  
Amount $ 33,414
Taiwan | Earliest Tax Year  
Operating Loss Carryforwards [Line Items]  
Expiring year 2024
Taiwan | Latest Tax Year  
Operating Loss Carryforwards [Line Items]  
Expiring year 2033