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Commitments (Leases Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 28, 2018 USD ($) ft² option
Lessee, Lease, Description [Line Items]
Tenant improvement reimbursements | $	$ 8,170
Cash paid for amounts included in the measurement of lease liabilities | $	$ 3,900
Weighted average remaining lease term for operating lease	9 years
Weighted average operating discount rate used to determine the operating lease liability	4.50%
Alameda, California
Lessee, Lease, Description [Line Items]
Area of leased property (in sqft)	134,765
Area of property available for lease (in squire feet)	170,000
South San Francisco, California
Lessee, Lease, Description [Line Items]
Area of leased property (in sqft)	116,063
Number of renewal options | option	2

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977

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