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Commitments and Contingencies (Details) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 17, 2017 USD ($) | Aug. 16, 2013 USD ($) | Dec. 15, 2009 USD ($) ft² | Sep. 30, 2011 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2013 USD ($) | Jan. 31, 2013 ft² | Sep. 29, 2012 USD ($) | Nov. 04, 2011 USD ($) ft² | Sep. 29, 2011 ft² | Mar. 08, 2010 ft²
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense related to imputed financing obligation |  |  |  |  | $ 4,300 | $ 4,400 | $ 4,400 |  |  |  |  |  |
Current and Long Term, Imputed Financing Obligation |  |  |  |  | 37,600 | 38,300 |  |  |  |  |  |  |
Capitalized property plant and equipment |  |  |  |  | 40,320 | 40,320 |  |  |  |  |  |  |
Restructuring charges |  |  |  |  | 2,217 | 0 | $ 0 |  |  |  |  |  |
Convertible notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |
Face Value |  | $ 138,000 |  |  | 0 | 81,207 |  |  |  |  |  |  |
Unamortized discount |  |  |  |  | 0 | 2,547 |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  |  |  |  | 0 | 209 |  |  |  |  |  |  |
Debt discount amortization period |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Convertible notes | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |
Face Value | $ 172,500 |  |  |  | 172,500 | 172,500 |  |  |  |  |  |  |
Unamortized discount |  |  |  |  | 28,517 | 34,506 |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  |  |  |  | $ 2,049 | $ 2,547 |  |  |  |  |  |  |
Debt discount amortization period | 5 years |  |  |  | 4 years 1 month 2 days |  |  |  |  |  |  |  |
Facility Closing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |
Sunnyvale Facility, Original agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options |  |  | 2 |  |  |  |  |  |  |  |  |  |
Period for extension of lease (in months) |  |  | 60 months |  |  |  |  |  |  |  |  |  |
Operating Lease Commitment Termination Period |  |  | 84 months |  |  |  |  |  |  |  |  |  |
Total reimbursement receivable under lease agreement |  |  | $ 9,100 |  |  |  |  |  |  |  |  |  |
Total space under lease (in square feet) | ft² |  |  | 125,000 |  |  |  |  |  |  |  |  |  |
Sunnyvale Facility, First Amended |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |
Total reimbursement receivable under lease agreement |  |  |  |  |  |  |  |  |  |  | $ 1,700 |  |
Total space under lease (in square feet) | ft² |  |  |  |  |  |  |  |  | 31,000 |  | 31,000 |  |
Sunnyvale Facility, Second Amended |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |
Total reimbursement receivable under lease agreement |  |  |  |  |  |  |  |  |  | $ 1,500 |  |  |
Ohio Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |
Period for extension of lease (in months) |  |  |  | 60 months |  |  |  |  |  |  |  |  |
Total space under lease (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  | 51,000 |
Fogg-Brecksville Development Co., Original |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |  |  |  |  |  |  |
Total space under lease (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  |  | 25,000

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