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Revenues - Revenues by Disaggregated Category (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 29, 2018	Mar. 30, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Product revenues:
Gross product revenues	$ 172,646		$ 100,258	$ 332,082	$ 178,217
Discounts and allowances	(26,810)		(12,254)	(51,974)	(21,336)
Net product revenues	145,836		88,004	280,108	156,881
Collaboration revenues:
License revenues	31,908		9,156	100,938	20,370
Research and development services revenues	6,805		2,175	16,904	3,307
Other collaboration revenues	1,559		(327)	1,877	(663)
Total collaboration revenues	40,272	$ 79,400	11,004	119,719	23,014
Total revenues	$ 186,108	$ 213,700	$ 99,008	$ 399,827	$ 179,895

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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.

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-Publisher FASB
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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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