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Revenues - Revenues by Disaggregated Category (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Product revenues:
Gross product revenues	$ 159,436	$ 77,959
Discounts and allowances	(25,164)	(9,082)
Net product revenues	134,272	68,877
Collaboration revenues:
License revenues	69,030	11,214
Research and development services revenues	10,099	1,132
Product supply revenues, net	(1,055)	(336)
Total collaboration revenues	78,074	12,010
Total revenues	$ 212,346	$ 80,887

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Product Supply Revenue

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Research And Development Service Revenue

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Amount of revenue earned from products sold or services provided under the terms of a contract, including, but not limited to, government contracts and construction contracts, classified as other.

+ 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 210.5-03.1)
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Revenue earned during the period relating to consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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-Publisher FASB
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Aggregate revenue during the period from sale of goods in the normal course of business, before deducting returns, allowances and discounts.

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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