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Organization and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 23 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 30, 2017 USD ($) | Sep. 28, 2018 USD ($) | Mar. 30, 2018 USD ($) | Sep. 29, 2017 USD ($) | Sep. 28, 2018 USD ($) segment product | Sep. 29, 2017 USD ($) | Dec. 28, 2018 USD ($) | Dec. 29, 2017 USD ($)
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of products that entered in the commercial marketplace | product |  |  |  |  | 3 |  |  |  |
Number of business segments | segment |  |  |  |  | 1 |  |  |  |
Increase in net cash provided by investing activities |  |  |  |  | $ (155,051) | $ 55,128 |  |  |
Reduction to accumulated deficit | $ (1,570,434) | $ (1,240,452) |  |  | (1,240,452) |  |  | $ (1,829,172) | [1]
Revenues |  | 225,397 |  | $ 152,510 | $ 625,224 | 332,405 |  |  |
Prompt payment discount rate |  |  |  |  | 2.00% |  |  |  |
Percent of total available discounts expected to be earned |  |  |  |  | 100.00% |  |  |  |
Products Derived from Cabozantinib |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of products that entered in the commercial marketplace | product |  |  |  |  | 2 |  |  |  |
Licenses |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  | 51,323 |  | 54,335 | $ 152,261 | 74,706 |  |  |
Collaborative Arrangement with Ipsen |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |  |  |  |
Milestone payments earned |  |  |  |  |  |  |  | $ 125,000 |
Revenues |  | 57,186 |  | $ 50,679 | 145,038 | 60,703 |  |  |
Collaborative Arrangement with Ipsen | EMA Approval - RCC |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  | 36,900 |  |  | 36,900 |  |  |  |
Collaborative Arrangement with Ipsen | EMA Approval - RCC | Licenses |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  | 200 | $ 45,800 |  |  |  |  |  |
ASU 2016-18 |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |  |  |  |
Increase in net cash provided by investing activities |  |  |  |  |  | $ 500 |  |  |
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |  |  |  |
Reduction to accumulated deficit | 258,505 |  |  |  |  |  |  |  |
Revenues |  | $ 32,558 |  |  | $ 9,809 |  |  |  |
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Collaborative Arrangement with Ipsen | HCC Filing |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |  |  |  |
Milestone payments earned | $ 10,000 |  |  |  |  |  |  |  |
Forecast | Collaborative Arrangement with Ipsen | EMA Approval - RCC | Licenses |  |  |  |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | $ 40,000 |  |
[1] | The Condensed Consolidated Balance Sheet as of December 31, 2017 has been derived from the audited financial statements as of that date.

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