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Collaboration Agreements (Daiichi Sankyo, Narrative) (Details) - Collaborative Arrangement with Daiichi Sankyo	12 Months Ended
	Dec. 28, 2018 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum amount eligible for development and regulatory milestones	$ 110,000,000
Maximum amount eligible for development and regulatory milestones upon first arm's-length sale	$ 20,000,000
Maximum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percent of royalty on net sale	0.50%

X

- Definition

Maximum amount eligible for development and regulatory milestones under collaborations agreement.

+ References

No definition available.

+ Details

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X

- Definition

Collaborative Arrangement, Maximum Amount Eligible for Development and Regulatory Milestones Upon First Sale

+ References

No definition available.

+ Details

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X

- Definition

Percent of royalty on net sale.

+ References

No definition available.

+ Details

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- 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

- Details

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X

- Details

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