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Intangible Assets - Estimated Future Amortization Expense for Purchased Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Estimated future amortization expense for purchased intangible assets    
2018 $ 16  
2019 16  
2020 16  
2021 16  
2022 16  
Thereafter 36  
Net Carrying Value $ 116 $ 132