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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, 2021 | Dec. 31, 2020
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | $ 88 | $ 22
Intangible assets, net | 12 | 4
Right of use assets carrying amount | 1,971 |
Taiwan |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Property, plant and equipment, net | 88 | 22
Intangible assets, net | 12 | $ 4
Right of use assets carrying amount | 1,897 |
Hong Kong |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Right of use assets carrying amount | $ 74 |

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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