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Balance Sheet Details - Property and Equipment, net (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 77,410 $ 66,148  
Accumulated depreciation and amortization (56,327) (50,018)  
Property and equipment, net 21,083 16,130 11,815
Computer equipment and purchased software [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 31,582 28,477  
Test Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 37,595 29,849  
Furniture and fixtures [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 1,470 1,480  
Leasehold improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 6,763 $ 6,342