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Collaboration Agreements - Ipsen Collaboration (Details) - USD ($) $ in Thousands	Mar. 29, 2019	Dec. 28, 2018	[1]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Net contract liability, current portion of deferred revenue	$ 2,376	$ 0
Net contract liability, long-term portion of deferred revenue	8,323	$ 15,897
Collaborative Arrangement with Ipsen
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Remaining performance obligation	46,800
Net contract liability	10,700
Net contract liability, current portion of deferred revenue	2,400
Net contract liability, long-term portion of deferred revenue	$ 8,300
[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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