Segment Reporting - Revenue and Assets (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Oct. 01, 2024	Sep. 30, 2025	Oct. 01, 2024	Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 122,086	$ 122,751	$ 372,313	$ 371,497
Less:
Other restaurant operating costs	24,558	24,124	74,628	71,514
General and administrative	12,272	12,892	37,486	39,503
Depreciation and amortization	6,604	7,248	20,833	21,985
Pre-opening	6	454	226	1,422
Restaurant impairments, closure costs and asset disposals	5,681	2,202	20,625	15,488
Total segment expenses	128,405	127,551	399,797	391,911
Loss from operations	(6,319)	(4,800)	(27,484)	(20,414)
Interest expense, net	2,827	2,082	8,227	6,058
Loss before income taxes	(9,146)	(6,882)	(35,711)	(26,472)
Assets	280,572		280,572		$ 324,648
Restaurant revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	119,579	120,163	364,686	363,897
Less:
Restaurant operating costs	30,709	30,665	95,862	91,223
Franchising royalties and fees, and other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	2,507	2,588	7,627	7,600
Labor
Less:
Restaurant operating costs	37,499	38,423	116,174	115,791
Occupancy
Less:
Restaurant operating costs	11,076	11,543	33,963	34,985
Reportable Segment
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	122,086	122,751	372,313	371,497
Less:
Restaurant operating costs	30,709	30,665	95,862	91,223
Other restaurant operating costs	24,558	24,124	74,628	71,514
General and administrative	12,272	12,892	37,486	39,503
Depreciation and amortization	6,604	7,248	20,833	21,985
Pre-opening	6	454	226	1,422
Restaurant impairments, closure costs and asset disposals	5,681	2,202	20,625	15,488
Total segment expenses	128,405	127,551	399,797	391,911
Loss from operations	(6,319)	(4,800)	(27,484)	(20,414)
Interest expense, net	2,827	2,082	8,227	6,058
Loss before income taxes	(9,146)	(6,882)	(35,711)	(26,472)
Total long-lived assets	247,612	295,058	247,612	295,058
Assets	280,572	324,648	280,572	324,648
Reportable Segment \| Restaurant revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	119,579	120,163	364,686	363,897
Reportable Segment \| Franchising royalties and fees, and other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	2,507	2,588	7,627	7,600
Reportable Segment \| Labor
Less:
Restaurant operating costs	37,499	38,423	116,174	115,791
Reportable Segment \| Occupancy
Less:
Restaurant operating costs	$ 11,076	$ 11,543	$ 33,963	$ 34,985

The gains and losses included in earnings resulting from the sale or disposal of tangible assets, asset impairment charges resulting from the write down of assets from their carrying value to their fair value, and costs incurred associated with an exit or disposal activity other than for a discontinued operations. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, but excludes costs associated with the retirement of a long-lived asset.

No definition available.