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Collaboration Agreements And In-Licensing Arrangements - Royalty Revenues under the Collaboration Agreement with Genentech (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2021	Apr. 03, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royalty revenues on ex-U.S. sales	$ 270,230	$ 226,915
Collaborative Arrangement with Genentech
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Profits on U.S. commercialization	1,794	1,407
Royalty revenues on ex-U.S. sales	$ 951	$ 1,309

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