Goodwill and Intangible Assets - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019	[1]
Goodwill And Intangible Assets Disclosure [Abstract]
Carrying value of goodwill	$ 533,000		$ 533,000
Impairment of goodwill	0
Amortization expense	$ 12,000	$ 12,000

[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 28, 2019.