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Revenue from Unaffiliated Customers by Geographic Region (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue $ 4,292 $ 5,585 $ 5,492
Taiwan      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 1,785 2,427 3,050
Hong Kong      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue $ 2,507 $ 3,158 $ 2,442