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Balance Sheet Details (Details) (USD $)
 12 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Sunnyvale, California
Dec. 31, 2011
Sunnyvale, California
Dec. 31, 2012
Building
Dec. 31, 2011
Building
Dec. 31, 2012
Computer software
Dec. 31, 2011
Computer software
Dec. 31, 2012
Computer equipment
Dec. 31, 2011
Computer equipment
Dec. 31, 2012
Furniture and fixtures
Dec. 31, 2011
Furniture and fixtures
Dec. 31, 2012
Leasehold improvements
Dec. 31, 2011
Leasehold improvements
Dec. 31, 2012
Machinery
Dec. 31, 2011
Machinery
Dec. 31, 2012
Construction in progress
Dec. 31, 2011
Construction in progress
Sep. 30, 2012
LDT
Building Improvements
Sep. 30, 2012
LDT
Software
Property, plant and equipment, net                                          
Property, plant and equipment, gross $ 153,348,000 $ 136,998,000       $ 42,129,000 $ 42,958,000 $ 36,349,000 $ 34,403,000 $ 29,371,000 $ 27,834,000 $ 12,708,000 $ 10,019,000 $ 9,731,000 $ 3,810,000 $ 13,501,000 $ 9,711,000 $ 9,559,000 $ 8,263,000    
Less accumulated depreciation and amortization (66,443,000) (55,893,000)                                      
Property, plant and equipment, net 86,905,000 81,105,000                                      
Tangible asset impairment charges                                       5,800,000 600,000
Construction costs capitalized 42,100,000 43,000,000                                      
Construction in progress, capitalized 48,800,000 49,200,000   6,700,000 6,200,000                                
Depreciation expense $ 13,190,000 $ 11,894,000 $ 10,101,000