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Collaboration Agreements - Ipsen Collaboration (Details) - USD ($) $ in Thousands | Sep. 27, 2019 | Dec. 28, 2018 | [1]
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Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Net contract liability | $ 15,399 | $ 15,897
Collaborative Arrangement with Ipsen |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |
Remaining performance obligation | 47,100 |
Net contract liability | $ 7,200 |
[1] | The Condensed Consolidated Balance Sheet as of December 31, 2018 has been derived from the audited financial statements as of that date.

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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