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Property and Equipment (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 28, 2018 USD ($) ft²	Dec. 28, 2018 USD ($) ft²	Dec. 29, 2017 USD ($)	Dec. 30, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation		$ 4.9	$ 1.2	$ 1.0
Leasehold Improvements, Buildings, Furniture and Fixtures, Computer Equipment and Software
Property, Plant and Equipment [Line Items]
Construction in progress capitalized	$ 46.3
Alameda, California
Property, Plant and Equipment [Line Items]
Area of leased property (in sqft) | ft²	134,765	134,765

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Property, Plant And Equipment, Additions And Transfers

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Area of a real estate property.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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