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Collaboration Agreements (Genentech Collaboration, Narrative) (Details) - Genentech [Member] - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2015 | Dec. 29, 2017 | Dec. 30, 2016
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Percentage of share of the Company in promotions | 25.00% |  |
Recovery (loss) of expenses, expenses prior to current fiscal year |  |  | $ 8.8
Selling, general and administrative expense [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Recovery (loss) of expenses, expenses prior to current fiscal year |  |  | 13.3
Contract revenue [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Recovery (loss) of expenses, expenses prior to current fiscal year |  |  | $ (4.5)
Profit Sharing Tier One [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Percent of profits |  | 50.00% |
Profit Sharing Tier Three [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Percent of profits |  | 30.00% |
Minimum [Member] | Profit Sharing Tier Two [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Profit threshold |  | $ 200.0 |
Maximum [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Percentage of share of the Company in promotions |  | 25.00% |
Maximum [Member] | Profit Sharing Tier Three [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Profit threshold |  | $ 400.0 |

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