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Organization and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended | 23 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 30, 2018 USD ($) segment product | Dec. 31, 2017 USD ($) | Dec. 29, 2017 USD ($) | Dec. 30, 2017 USD ($) | Feb. 29, 2016 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 |  |  |  |  |
Reduction to accumulated deficit | $ (1,454,810) |  | $ (1,829,172) | [1] | $ (1,570,667) |
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 |  |  |  |  |
Collaborative Arrangement with Ipsen |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |
Milestone payments earned |  |  | $ 125,000 |  |  |
Additional milestone achievement |  |  |  |  |  | $ 199,000
Collaborative Arrangement with Ipsen | HCC Filing |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |
Milestone payments earned |  | $ 10,000 |  |  |  |
Collaborative Arrangement with Ipsen | EMA Approval |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |
Milestone revenue recognized | $ 45,800 |  |  |  |  |
Additional milestone achievement | 50,000 |  |  |  |  |
ASU 2014-09 | Adjustments Due to the Adoption of Topic 606 |  |  |  |  |  |
Organization And Summary Of Significant Policies [Line Items] |  |  |  |  |  |
Reduction to accumulated deficit | $ 289,012 |  |  |  | $ 258,505 |
[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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