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Collaboration Agreements (Other Collaborations, Narrative) (Details)	1 Months Ended	12 Months Ended
	Nov. 30, 2015	Dec. 28, 2018 USD ($) clinical_trial
Collaborative Arrangement with Genentech
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of share of the Company in promotions	25.00%
Number of clinical trials (more than) | clinical_trial		50
Collaborative Arrangement with Daiichi Sankyo
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum amount eligible for development and regulatory milestones		$ 110,000,000
Collaborative Arrangement with Daiichi Sankyo | Maximum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percent of royalty on net sales		0.50%
Collaborative Arrangement with BMS
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum amount eligible for development and regulatory milestones		$ 240,000,000
Maximum amount eligible for royalties on sales under collaborations agreement		$ 150,000,000
Profit Sharing Tier One | Collaborative Arrangement with Genentech
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percent of profits		50.00%
Profit Sharing Tier Two | Collaborative Arrangement with Genentech | Minimum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Profit threshold		$ 200,000,000
Profit Sharing Tier Three | Collaborative Arrangement with Genentech
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percent of profits		30.00%
Profit Sharing Tier Three | Collaborative Arrangement with Genentech | Maximum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Profit threshold		$ 400,000,000

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