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Goodwill and Intangible Assets - Future Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
[1]
Future estimated amortization expense    
2018 (nine months) $ 12  
2019 16  
2020 16  
2021 16  
2022 16  
Thereafter 36  
Net Carrying Amount $ 112 $ 116
[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 30, 2017.