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Long-lived Assets (Property And Equipment, net) by Geographic Area (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property and equipment, net | $ 105,496 | $ 98,488 | $ 101,410
Taiwan |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property and equipment, net | 102,420 | 94,996 | 96,920
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property and equipment, net | 254 | 315 | 348
Korea |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property and equipment, net | 11 | 23 | 1,645
China |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property and equipment, net | 2,770 | 3,117 | 2,447
Japan |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Property and equipment, net | $ 41 | $ 37 | $ 50

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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