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Subsequent Event	6 Months Ended
	Jun. 28, 2019
Subsequent Events [Abstract]
SUBSEQUENT EVENT	SUBSEQUENT EVENT Aurigene Discovery Technologies Limited (Aurigene) Collaboration In July 2019, we entered into an exclusive option and license agreement with Aurigene, a biotechnology company based in India focused on oncology and inflammatory disorders, to in-license up to six oncology programs from Aurigene. Under the terms of the agreement, we will make an upfront payment of $10.0 million for exclusive options to license three preexisting programs. In addition, Exelixis and Aurigene will initiate three Aurigene-led drug discovery programs on mutually agreed upon targets for additional upfront payments of $2.5 million per program. We will also contribute research funding of up to $32.6 million to Aurigene for discovery and preclinical development work on all six programs. For each option we decide to exercise, we would be required to pay an exercise fee of either $10.0 million or $12.0 million, depending on the program, and would assume responsibilities for all subsequent clinical development, commercialization and global manufacturing of that program. Aurigene would then become eligible for up to $148.8 million per program in potential development and regulatory milestone payments, $280.0 million per program in potential commercial milestone payments, as well as royalties on potential sales. Under the terms of the agreement, Aurigene retains limited development and commercial rights for India and Russia.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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