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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
Segment Reporting Information [Line Items]      
Property and equipment, net $ 35,537us-gaap_PropertyPlantAndEquipmentNet $ 30,195us-gaap_PropertyPlantAndEquipmentNet $ 23,386us-gaap_PropertyPlantAndEquipmentNet
Taiwan      
Segment Reporting Information [Line Items]      
Property and equipment, net 28,739us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_TW
24,066us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_TW
16,799us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_TW
United States      
Segment Reporting Information [Line Items]      
Property and equipment, net 142us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
54us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
58us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
Korea      
Segment Reporting Information [Line Items]      
Property and equipment, net 2,477us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_KR
1,773us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_KR
2,226us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_KR
China      
Segment Reporting Information [Line Items]      
Property and equipment, net $ 4,179us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CN
$ 4,302us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CN
$ 4,303us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CN