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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Convertible notes
Dec. 31, 2012
Convertible notes
Jul. 10, 2009
Convertible notes
5% Convertible Senior Notes due 2014
Jun. 29, 2009
Convertible notes
5% Convertible Senior Notes due 2014
Dec. 31, 2013
Convertible notes
5% Convertible Senior Notes due 2014
Dec. 31, 2012
Convertible notes
5% Convertible Senior Notes due 2014
Aug. 16, 2013
Convertible notes
1.125% Convertible Senior Notes due 2018
Dec. 31, 2013
Convertible notes
1.125% Convertible Senior Notes due 2018
Dec. 31, 2012
Convertible notes
1.125% Convertible Senior Notes due 2018
Dec. 31, 2013
Facility Closing [Member]
Dec. 15, 2009
Sunnyvale Facility, Original agreement
sqft
Jan. 31, 2013
Sunnyvale Facility, First Amended
sqft
Nov. 04, 2011
Sunnyvale Facility, First Amended
sqft
Sep. 29, 2012
Sunnyvale Facility, Second Amended
Sep. 29, 2011
Ohio Facility
sqft
Mar. 08, 2010
Fogg-Brecksville Development Co., Original
sqft
Feb. 01, 2012
San Francisco Facility
Nov. 04, 2011
San Francisco Facility
sqft
Lease Commitments                                                    
Lease term (in months)                                                 75 months  
Number of options                                     2              
Period for extension of lease (in months)                                     60 months       60 months      
Period for termination of lease (in months)                                     84 months              
Total reimbursement receivable under lease agreement                                     $ 9,100,000   $ 1,700,000 $ 1,500,000        
Interest expense related to imputed financing obligation           4,400,000 4,100,000 3,300,000                                    
Current and Long Term, Imputed Financing Obligation 39,700,000     45,900,000   39,700,000 45,900,000                                      
Capitalized property plant and equipment 40,300,000     48,800,000   40,300,000 48,800,000                                      
Total space under lease (in square feet)                                     125,000 31,000 31,000   51,000 25,000   26,000
Restructuring charges 2,200,000 1,100,000 2,200,000 700,000 6,600,000 5,546,000 7,301,000 0                   2,000,000                
Face Value                 310,500,000 172,500,000   150,000,000 172,500,000 172,500,000 138,000,000 138,000,000 0                  
Additional borrowings on debt instrument                     22,500,000                              
Unamortized discount $ 36,824,000     $ 24,944,000   $ 36,824,000 $ 24,944,000           $ 8,453,000 $ 24,944,000   $ 28,371,000 $ 0                  
Debt discount amortization period                       5 years 6 months   5 years 56 months