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Basis of Presentation - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 28, 2020
Dec. 28, 2019
Mar. 30, 2019
Dec. 29, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]        
Cash and cash equivalents $ 11,139 $ 12,653 $ 17,175 $ 21,194
Accumulated deficit $ 52,266 $ 50,615 [1]    
[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 28, 2019.