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Property and Equipment - Narrative (Details) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
May 02, 2017 USD ($) ft² | Mar. 30, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 29, 2017 USD ($) | Oct. 16, 2017 ft²
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciation expense |  | $ 0.4 | $ 0.3 |  |
Construction-in-Progress |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Construction in progress capitalized | $ 14.5 | 26.8 |  |  |
Prepaid construction costs |  | $ 0.6 |  | $ 11.1 |
Operating Leases and Other Financing Leases | Alameda, California |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Area of lease property (in square feet) | ft² | 110,783 |  |  |  |
Optional Amendment Agreement | Alameda, California |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Area of lease property (in square feet) | ft² |  |  |  |  | 19,778
Capital Leases and Other Financing Leases |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Tenant improvements allowance | $ 7.7 |  |  |  |

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