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Revenue from Unaffiliated Customers by Geographic Region (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue $ 5,585 $ 5,492 $ 6,875
Taiwan      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 2,427 3,050 3,743
Hong Kong      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue $ 3,158 $ 2,442 $ 3,132