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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, 2024 | Dec. 31, 2023
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | $ 101 | $ 111
Intangible assets, net | 7 | 13
Right of use assets carrying amount | 484 | 944
Taiwan |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 101 | 111
Intangible assets, net | 7 | 13
Right of use assets carrying amount | 466 | 869
Hong Kong |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Right of use assets carrying amount | $ 18 | $ 75

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