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Revenues (Net Product Revenues Disaggregated by Product) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 29, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net product revenues | $ 228,602 | $ 225,397 | $ 186,108 | $ 213,719 | $ 120,072 | $ 152,510 | $ 99,008 | $ 80,887 | $ 853,826 | $ 452,477 | $ 191,454
Net Product Revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net product revenues |  |  |  |  |  |  |  |  | 619,279 | 349,008 | 135,375
CABOMETYX |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net product revenues |  |  |  |  |  |  |  |  | 599,946 | 324,000 | 93,481
COMETRIQ |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net product revenues |  |  |  |  |  |  |  |  | $ 19,333 | $ 25,008 | $ 41,894

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