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Collaboration Agreements (Other Collaborations, Narrative) (Details) | 1 Months Ended | 12 Months Ended
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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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