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Recent Accounting Pronouncements - Narratives (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 28, 2018 | Sep. 28, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Sep. 29, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Accumulated deficit | $ (2,070,746) | $ (2,070,746) |  | $ (2,057,812) |  |
Net Capitalized Contract Costs | 1,800 | 1,800 |  |  |  |
Capitalized Contract Cost, Amortization | 400 | 900 |  |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Accumulated deficit |  |  | $ (2,046,381) |  |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Accumulated deficit | 13,276 | 13,276 | 11,431 |  |  |
Accounting Standards Update 2016-18 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Restricted Cash | 200 | 200 |  | $ 1,700 | $ 2,000 | $ 1,800
Included In Deferred Revenue Balance At January 1, 2018 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Deferred Revenue, Revenue Recognized | 7,800 | 43,200 |  |  |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net Capitalized Contract Costs | 1,300 | 1,300 |  |  |  |
Other Noncurrent Assets [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net Capitalized Contract Costs | $ 500 | $ 500 |  |  |  |
Sales Commission Contract Costs [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Accumulated deficit |  |  | $ 1,400 |  |  |
Minimum [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Capitalized Contract Cost, Amortization Period |  |  | 1 year |  |  |

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