Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2022	Jun. 30, 2021	Jun. 29, 2022	Jun. 30, 2021
Revenue
Total revenue	$ 124,111	$ 121,985	$ 234,159	$ 229,706
Cost of operations
Food and paper cost	31,691	27,882	59,423	52,273
Labor and related expenses	33,015	31,526	65,687	62,258
Occupancy and other operating expenses	25,832	25,336	49,677	49,180
Company restaurant expenses	90,538	84,744	174,787	163,711
General and administrative expenses	9,679	10,523	19,633	20,997
Franchise expenses	9,557	8,161	18,288	15,912
Depreciation and amortization	3,618	3,917	7,215	7,855
Loss on disposal of assets	42	85	108	111
Loss on assets held for sale		1,524		1,524
Impairment and closed-store reserves	248	360	379	924
Total expenses	113,682	109,314	220,410	211,034
Income from operations	10,429	12,671	13,749	18,672
Interest expense, net	419	433	849	950
Income tax receivable agreement income	(186)	27	(316)	(50)
Income before provision for income taxes	10,196	12,211	13,216	17,772
Provision for income taxes	3,055	3,393	3,960	4,990
Net income	$ 7,141	$ 8,818	$ 9,256	$ 12,782
Net income per share
Basic (usd per share)	$ 0.20	$ 0.25	$ 0.26	$ 0.36
Diluted (usd per share)	$ 0.20	$ 0.24	$ 0.25	$ 0.35
Weighted-average shares used in computing net income per share
Basic (shares)	36,331,099	35,927,781	36,278,423	35,861,493
Diluted (shares)	36,473,960	36,416,686	36,478,808	36,423,394
Company-operated restaurant revenue
Revenue
Total revenue	$ 106,454	$ 106,970	$ 200,411	$ 201,131
Franchise revenue
Revenue
Total revenue	10,064	8,389	19,319	16,001
Franchise advertising fee revenue
Revenue
Total revenue	$ 7,593	$ 6,626	$ 14,429	$ 12,574