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Collaboration Agreements, In-Licensing Arrangements And Business Development Activities - Takeda Collaboration Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
	Oct. 01, 2021 USD ($)	Oct. 01, 2021 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Remaining performance obligation	$ 86.5	$ 86.5
Collaborative Arrangement with Takeda
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Amount of revenues recognized included in the beginning contract liability balance	18.8	18.8
Revenue from contract with customer, regulatory milestone probable of achievement		20.0
Remaining performance obligation	$ 41.7	$ 41.7

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- Definition

Revenue From Contract With Customer, Regulatory Milestone Probable Of Achievement

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045

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