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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Mar. 30, 2018
Dec. 29, 2017
Mar. 31, 2017
Dec. 31, 2016
Cash and cash equivalents $ 20,771 $ 18,520 $ 13,500  
Restricted cash included in other long-term assets 121 121 119  
Total cash, cash equivalents and restricted cash as shown in the Consolidated Statements of Cash Flows $ 20,892 $ 18,641 $ 13,619 $ 14,118