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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Sep. 28, 2018
Dec. 29, 2017
Sep. 29, 2017
Dec. 29, 2016
Cash and cash equivalents $ 102,195 $ 18,520 $ 16,133  
Restricted cash included in other long-term assets 121 121 120  
Total cash, cash equivalents and restricted cash as shown in the Consolidated Statements of Cash Flows $ 102,316 $ 18,641 $ 16,253 $ 14,118