Revenue Recognition (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2020	Oct. 01, 2019	Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected unredeemed percent	9.00%
Estimated redemption period	24 months
Gift card liability, current	$ 1,862		$ 2,398
Revenue recognized	$ 2,800	$ 4,100
Period in which initial fees received from franchisees will be recognized as revenue	20 years
Deferred revenue	$ 2,046		555
Accrued Expenses and Other Current Liabilities
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Gift card liability, current	1,900		2,400
Other Long-term Liabilities
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Gift card liability, non-current	$ 500		$ 900