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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 |
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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 |  |  |  |  |  |  |  |  |  |

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- Definition The unamortized amount of current and long-term liabilities that an Entity assumes in consideration for the estimated fair value of the Entity's share of buildings in the build out of leased facilities plus any tenant improvement allowance received from landlords. As the Entity retains sufficient continuing involvement following the completion of construction, for accounting purposes, the Entity is treated as the owner of the leased facilities and to record an imputed financing obligation for its obligation to the legal owners. + References No definition available. + Details
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- Definition Represents the total capitalized amount of property, plant and equipment which was based on the estimated fair value of the portion of the unfinished leased building along with a corresponding financing obligation for the same amount. + References No definition available. + Details
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- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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