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Collaboration Agreements - Royalty Revenues under the Collaboration Agreement with GlaxoSmithKline (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 29, 2018 | Jun. 30, 2017 | Jun. 29, 2018 | Jun. 30, 2017
Collaboration Agreement with GlaxoSmithKline |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Royalties accruing to GSK | $ 5,628 | $ 2,962 | $ 10,753 | $ 5,363

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- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + 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 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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