Revenues - Net Product Revenues Disaggregated by Product (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 30, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Net product revenues	$ 212,346	$ 80,887
Product
Disaggregation of Revenue [Line Items]
Net product revenues	134,272	68,877
CABOMETYX
Disaggregation of Revenue [Line Items]
Net product revenues	128,934	62,359
COMETRIQ
Disaggregation of Revenue [Line Items]
Net product revenues	$ 5,338	$ 6,518

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration