Segment Reporting - Revenue and Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2025	Dec. 31, 2024	Jan. 02, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 495,089	$ 493,271	$ 503,405
Less:
Other restaurant operating costs	98,876	95,032	91,559
General and administrative	49,137	50,824	51,833
Depreciation and amortization	27,047	29,066	26,792
Pre-opening	225	1,543	2,215
Restaurant impairments, closure costs and asset disposals	26,262	20,268	8,400
Costs and Expenses	526,678	521,049	508,434
Loss from operations	(31,589)	(27,778)	(5,029)
Interest expense, net	10,915	8,381	4,803
Loss before income taxes	(42,504)	(36,159)	(9,832)
Assets	261,671	324,648
Restaurant revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	485,103	483,097	492,648
Less:
Restaurant operating costs	127,168	123,692	124,102
Franchising royalties and fees, and other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	9,986	10,174	10,757
Labor
Less:
Restaurant operating costs	153,342	154,258	157,608
Occupancy
Less:
Restaurant operating costs	44,621	46,366	45,925
Reportable Segment
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	495,089	493,271	503,405
Less:
Other restaurant operating costs	98,876	95,032	91,559
General and administrative	49,137	50,824	51,833
Depreciation and amortization	27,047	29,066	26,792
Pre-opening	225	1,543	2,215
Restaurant impairments, closure costs and asset disposals	26,262	20,268	8,400
Costs and Expenses	526,678	521,049	508,434
Loss from operations	(31,589)	(27,778)	(5,029)
Long-lived assets	233,678	295,058
Assets	261,671	324,648
Reportable Segment | Restaurant revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	485,103	483,097	492,648
Reportable Segment | Franchising royalties and fees, and other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	9,986	10,174	10,757
Less:
Restaurant operating costs	127,168	123,692	124,102
Reportable Segment | Labor
Less:
Restaurant operating costs	153,342	154,258	157,608
Reportable Segment | Occupancy
Less:
Restaurant operating costs	$ 44,621	$ 46,366	$ 45,925