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Balance Sheets Components (Schedule of Property and Equipment) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2017
Sep. 25, 2016
Oct. 01, 2017
Sep. 25, 2016
Jan. 01, 2017
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 14,682   $ 14,682   $ 10,727
Accumulated depreciation and amortization (7,550)   (7,550)   (5,985)
Net long-lived assets 7,132   7,132   4,742
Construction-in-progress 4,083   4,083   0
Total 11,215   11,215   4,742
Depreciation and amortization 500 $ 300 1,566 $ 880  
Computer and lab equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 13,342   13,342   9,748
Computer software          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 795   795   625
Furniture and fixtures          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 203   203   136
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 342   $ 342   $ 218