Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2021	Jun. 30, 2020	Jun. 29, 2021	Jun. 30, 2020	Dec. 29, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected unredeemed percent			9.00%
Estimated redemption period			24 months
Gift card liability, current	$ 2,270		$ 2,270		$ 2,551
Revenue recognized for redemption of gift cards	800	$ 600	$ 1,900	$ 2,100
Period in which initial fees received from franchisees will be recognized as revenue			20 years
Deferred revenue	291		$ 291		427
Accrued Expenses and Other Current Liabilities
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Gift card liability, current	2,300		2,300		2,600
Other Long-term Liabilities
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Gift card liability, non-current	$ 400		$ 400		$ 600