Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2023	Jun. 28, 2022	Jul. 04, 2023	Jun. 28, 2022
Revenue:
Total revenue	$ 125,154	$ 131,067	$ 251,231	$ 243,629
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Other restaurant operating costs	22,594	22,792	46,605	44,658
General and administrative	12,463	12,744	26,104	24,584
Depreciation and amortization	6,437	5,763	12,687	11,484
Pre-opening	609	353	1,101	761
Restaurant impairments, closure costs and asset disposals	1,609	1,971	3,178	3,360
Total costs and expenses	125,434	129,189	253,738	247,826
(Loss) income from operations	(280)	1,878	(2,507)	(4,197)
Interest expense, net	1,054	489	2,015	926
(Loss) income before taxes	(1,334)	1,389	(4,522)	(5,123)
(Benefit from) provision for income taxes	(30)	44	(103)	(39)
Net (loss) income	$ (1,304)	$ 1,345	$ (4,419)	$ (5,084)
(Loss) earnings per Class A and Class B common stock, combined
Basic (USD per share)	$ (0.03)	$ 0.03	$ (0.10)	$ (0.11)
Diluted (USD per share)	$ (0.03)	$ 0.03	$ (0.10)	$ (0.11)
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	46,363,208	45,881,354	46,239,357	45,803,927
Diluted (in shares)	46,363,208	46,108,720	46,239,357	45,803,927
Restaurant revenue
Revenue:
Total revenue	$ 122,394	$ 128,274	$ 245,621	$ 238,235
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Restaurant operating costs	30,700	35,664	61,725	66,435
Franchising royalties and fees, and other
Revenue:
Total revenue	2,760	2,793	5,610	5,394
Labor
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Restaurant operating costs	39,657	38,828	79,487	74,321
Occupancy
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Restaurant operating costs	$ 11,365	$ 11,074	$ 22,851	$ 22,223