Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies and Nature of Operations - Aggregate Warranty Liabilities (Details)

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Summary of Significant Accounting Policies and Nature of Operations - Aggregate Warranty Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Warranty liabilities, beginning of period $ 1,420 $ 1,410
Additions to warranty liabilities 690 597
Reductions to warranty liabilities (698) (587)
Warranty liabilities, end of period $ 1,412 $ 1,420