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Property and Equipment - Narrative (Details)
$ in Thousands
1 Months Ended 6 Months Ended
Jun. 29, 2018
USD ($)
Jun. 29, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
ft²
Dec. 29, 2017
USD ($)
Property, Plant and Equipment [Line Items]          
Depreciation expense   $ 1,200 $ 600    
Fair value of buildings $ 78,898 78,898     $ 48,543
Financing obligations included in other current liabilities 700 700      
Financing obligation for build-to-suit lease 20,646 20,646     14,530
Leasehold Improvements, Buildings, Furniture and Fixtures, Computer Equipment and Software          
Property, Plant and Equipment [Line Items]          
Construction in progress capitalized 59,500        
Construction in Progress          
Property, Plant and Equipment [Line Items]          
Fair value of buildings 1,839 1,839     22,114
Buildings          
Property, Plant and Equipment [Line Items]          
Fair value of buildings $ 14,530 $ 14,530     $ 0
Estimated useful life 40 years        
Operating Leases and Other Financing Leases | Alameda, California          
Property, Plant and Equipment [Line Items]          
Area of lease property (in square feet) | ft²       134,765