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Long-lived Assets (Property And Equipment, net) by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Segment Reporting Information [Line Items] |  |  |
Property and equipment, net | $ 35,537 us-gaap_PropertyPlantAndEquipmentNet | $ 30,195 us-gaap_PropertyPlantAndEquipmentNet | $ 23,386 us-gaap_PropertyPlantAndEquipmentNet
Taiwan |  |  |
Segment Reporting Information [Line Items] |  |  |
Property and equipment, net | 28,739 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_TW | 24,066 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_TW | 16,799 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_TW
United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Property and equipment, net | 142 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 54 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 58 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
Korea |  |  |
Segment Reporting Information [Line Items] |  |  |
Property and equipment, net | 2,477 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_KR | 1,773 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_KR | 2,226 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_KR
China |  |  |
Segment Reporting Information [Line Items] |  |  |
Property and equipment, net | $ 4,179 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN | $ 4,302 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN | $ 4,303 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN

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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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Details
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