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Intangible Assets - Components of Purchased Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Components of purchased intangible assets    
Annual Amortization $ 16 $ 16
Gross Carrying Value 840 840
Accumulated Amortization 756 740
Net Carrying Value $ 84 $ 100
Customer Relations    
Components of purchased intangible assets    
Useful Lives 15 years 15 years
Useful Lives Remaining 5 years 3 months 6 years 3 months
Annual Amortization $ 16 $ 16
Gross Carrying Value 240 240
Accumulated Amortization 156 140
Net Carrying Value 84 100
Patents    
Components of purchased intangible assets    
Gross Carrying Value 600 600
Accumulated Amortization $ 600 $ 600