LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2023	Sep. 28, 2022	Sep. 27, 2023	Sep. 28, 2022
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	$ 19	$ 19	$ 57	$ 57
Interest on lease liabilities	10	11	31	34
Operating Lease, Cost	6,946	6,902	20,931	20,571
Short-term Lease, Cost	2	4	6	11
Variable Lease, Cost	482	347	1,331	921
Sublease Income	(1,280)	(1,130)	(3,773)	(3,387)
Total lease cost	6,179	6,153	18,583	18,207
Operating Expense [Member]
Lessee, Lease, Description [Line Items]
Total lease cost	6,043	5,969	18,101	17,709
General and Administrative Expense
Lessee, Lease, Description [Line Items]
Total lease cost	107	133	375	343
Depreciation and amortization [Member]
Lessee, Lease, Description [Line Items]
Total lease cost	19	18	57	55
Interest Expense
Lessee, Lease, Description [Line Items]
Total lease cost	10	11	31	35
Restructuring Charges [Member]
Lessee, Lease, Description [Line Items]
Total lease cost		22	19	65
Property Lease [Member]
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	18	18	55	55
Interest on lease liabilities	9	10	29	32
Operating Lease, Cost	6,903	6,646	20,589	19,795
Variable Lease, Cost	150	151	422	458
Sublease Income	(1,280)	(1,130)	(3,773)	(3,387)
Total lease cost	5,800	5,695	17,322	16,953
Equipment Lease
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	1	1	2	2
Interest on lease liabilities	1	1	2	2
Operating Lease, Cost	43	256	342	776
Short-term Lease, Cost	2	4	6	11
Variable Lease, Cost	332	196	909	463
Total lease cost	$ 379	$ 458	$ 1,261	$ 1,254