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Property and Equipment (Narrative) (Details) $ in Millions | 12 Months Ended
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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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- Definition 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Details
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