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Collaboration Agreements - Takeda Collaboration (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 03, 2020 USD ($)	Jul. 03, 2020 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Remaining performance obligation	$ 71.4	$ 71.4
Collaborative Arrangement with Takeda
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone payments earned	23.7	23.7
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement	31.0	31.0
Remaining performance obligation	$ 25.1	$ 25.1

X

- Definition

Eligible Payment From Collaboration For Development And Regulatory Milestone Achievement Under Collaborations Agreement

+ References

No definition available.

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X

- Definition

Milestone Payments Earned

+ References

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X

- Definition

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.

+ Details

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X

- Definition

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

+ References

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=121604090&loc=SL49130556-203045

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