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Quarterly Financial Data (Unaudited) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 30, 2016	Sep. 30, 2016	Dec. 29, 2017
Deferred Revenue Arrangement [Line Items]
Accrued clinical trial liabilities	$ 14,131	$ 18,700	$ 19,849
Collaborative Arrangement with Genentech [Member]
Deferred Revenue Arrangement [Line Items]
Recovery of net losses	$ 23,100
Recovery of net losses, recognized in current fiscal year		$ 9,800

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- Definition

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+ References

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- Definition

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- Definition

Return of or reimbursements received in relation to direct costs and expenses previously paid or incurred.

+ References

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 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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