LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2024	Sep. 27, 2023	Sep. 25, 2024	Sep. 27, 2023
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	$ 43	$ 19	$ 129	$ 57
Interest on lease liabilities	14	10	41	31
Fixed rent cost	7,082	6,946	21,442	20,931
Short-term lease cost	1	2	2	6
Variable lease cost	472	482	1,449	1,331
Sublease income	(1,817)	(1,280)	(5,354)	(3,773)
Total lease cost	5,795	6,179	17,709	18,583
Occupancy and other operating expenses
Lessee, Lease, Description [Line Items]
Total lease cost	5,662	6,043	17,228	18,101
General and Administrative Expense
Lessee, Lease, Description [Line Items]
Total lease cost	76	107	311	375
Depreciation and amortization
Lessee, Lease, Description [Line Items]
Total lease cost	43	19	129	57
Interest expense
Lessee, Lease, Description [Line Items]
Total lease cost	14	10	41	31
Closed-store reserve
Lessee, Lease, Description [Line Items]
Total lease cost				19
Property Leases
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	18	18	56	55
Interest on lease liabilities	8	9	27	29
Fixed rent cost	7,012	6,903	21,220	20,589
Variable lease cost	164	150	448	422
Sublease income	(1,817)	(1,280)	(5,354)	(3,773)
Total lease cost	5,385	5,800	16,397	17,322
Equipment Leases
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	25	1	73	2
Interest on lease liabilities	6	1	14	2
Fixed rent cost	70	43	222	342
Short-term lease cost	1	2	2	6
Variable lease cost	308	332	1,001	909
Total lease cost	$ 410	$ 379	$ 1,312	$ 1,261