Revenue Recognition (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2019	Oct. 02, 2018	Jan. 02, 2019	Jan. 01, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected unredeemed percent	9.00%
Estimated redemption period	24 months
Gift card liability	$ 1,446			$ 3,284
Revenue recognized	$ 4,100	$ 4,400
Gift card breakage		$ 300
Period in which initial fees received from franchisees will be recognized as revenue	20 years
Retained earnings	$ (114,297)		$ (117,127)	(111,135)
Accrued Expenses and Other Current Liabilities
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Gift card liability	1,400			3,300
Other Long-term Liabilities
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Gift card liability, non-current	$ 700			$ 400