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Long-lived Assets (Property And Equipment, net) by Geographic Area (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Property and equipment, net $ 50,469 $ 35,537 $ 30,195
Taiwan      
Segment Reporting Information [Line Items]      
Property and equipment, net 32,014 28,739 24,066
United States      
Segment Reporting Information [Line Items]      
Property and equipment, net 274 142 54
Korea      
Segment Reporting Information [Line Items]      
Property and equipment, net 1,891 2,477 1,773
China      
Segment Reporting Information [Line Items]      
Property and equipment, net 16,268 4,163 4,266
Japan      
Segment Reporting Information [Line Items]      
Property and equipment, net $ 22 $ 16 $ 36