Revenue from Contracts with Customers - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) restaurant item	Dec. 30, 2020 USD ($)	Mar. 25, 2020 restaurant
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of revenue streams | item	2
Accrued Loyalty Rewards Program Liability, Current	$ 700,000	$ 900,000
Loyalty Rewards Program, Expected Loyalty Points Redemption Period	1 year
Unsatisfied performance obligations	$ 5,642,000
Additional contract liability	$ 177,000
Franchise Rights
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Finite-Lived Intangible Asset, Useful Life Renewal Period	20 years
Hardware Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unsatisfied performance obligations	$ 0
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with Customer, Liability, Revenue Recognized, Period	10 years
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with Customer, Liability, Revenue Recognized, Period	20 years
California
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of Restaurants | restaurant	3		3