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Collaboration Agreements - Daiichi Sankyo (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 28, 2019	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues		$ 240,275	$ 186,108	$ 455,762	$ 399,827
Collaboration revenue
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues		46,600	40,272	82,506	119,719
Collaboration Agreement with Daiichi Sankyo
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues		$ 20,114	$ 0	$ 20,114	$ 20,000
Percent of royalty on net sale				0.50%
Collaboration Agreement with Daiichi Sankyo | Collaboration revenue
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenues	$ 20,000

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Collaboration Agreement, Percent Of Royalty On Net Sale

+ References

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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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