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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 |

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