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Goodwill and Intangible Assets - Additional Information (Details) - USD ($)
6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Dec. 29, 2018
[1]
Goodwill And Intangible Assets Disclosure [Abstract]      
Carrying value of goodwill $ 533,000   $ 533,000
Impairment of goodwill 0    
Amortization expense $ 8,000 $ 8,000  
[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 29, 2018.