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Property and Equipment (Narrative) (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
May 02, 2017 USD ($) ft² | Dec. 29, 2017 USD ($) | Dec. 30, 2016 USD ($) | Jan. 01, 2016 USD ($) | Oct. 16, 2017 ft²
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciation |  | $ 1.2 | $ 1.0 | $ 1.4 |
Construction-in-progress [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Construction in process costs capitalized | $ 14.5 | 6.6 |  |  |
Prepaid construction costs |  | $ 11.1 |  |  |
Capital lease and other financing lease [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Tenant improvements allowance | $ 7.7 |  |  |  |
Alameda, California [Member] | Operating lease and other financing lease [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Area of leased property (in sqft) | ft² | 110,783 |  |  |  |
Alameda, California [Member] | Optional amendment agreement [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Area of leased property (in sqft) | ft² | 16,343 |  |  |  | 19,778

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