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Leases - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 28, 2018 USD ($) ft²	Jul. 31, 2018 ft²	Apr. 30, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Term of finance lease			3 years
Cash payments required over life of financing lease | $			$ 0.2
Cash paid for amounts included in the measurement of lease liabilities | $	$ 3.3
Weighted average remaining lease term for operating lease	9 years 3 months 18 days
Weighted average operating discount rate used to determine the operating lease liability	4.50%
Operating Leases and Other Financing Leases | Alameda, California
Lessee, Lease, Description [Line Items]
Area of lease property (in square feet)	134,765
Area of property available for lease (in squire feet)	170,000
Operating Leases and Other Financing Leases | South San Francisco, California
Lessee, Lease, Description [Line Items]
Area of lease property (in square feet)		116,063

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Area Of Real Estate Property, Available To Lease

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Area of a real estate property.

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Amount of lessee's undiscounted obligation for lease payments for finance lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
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Term of lessee's finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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