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Basis of Presentation and Significant Accounting Policies (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Royalty income [1] $ 159 $ 141 $ 465 $ 400
[1] Shown as a separate line item in other income, net on the Condensed Consolidated Statements of Operations.