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Geographic Information for Property, Plant and Equipment, Intangible Assets and Operating Lease Right-of-use Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net $ 111 $ 103  
Intangible assets, net 13 19  
Right of use assets carrying amount 944 1,306 $ 1,971
Taiwan      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 111 103  
Intangible assets, net 13 19  
Right of use assets carrying amount 869 1,289  
Hong Kong      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Right of use assets carrying amount $ 75 $ 17