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Segment Information (Revenues from Geographic Regions) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 30, 2016 | Sep. 30, 2016 | Jul. 01, 2016 | Apr. 01, 2016 | Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 120,072 | $ 152,510 | $ 99,008 | $ 80,887 | $ 77,581 | $ 62,194 | $ 36,252 | $ 15,427 | $ 452,477 | $ 191,454 | $ 37,172
Geographic concentration risk [Member] | Sales revenue, net [Member] | U.S. [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 367,906 | 140,709 | 33,869
Geographic concentration risk [Member] | Sales revenue, net [Member] | Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 69,792 | 35,745 | 3,303
Geographic concentration risk [Member] | Sales revenue, net [Member] | Rest of the world [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 14,779 | $ 15,000 | $ 0

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