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SEGMENT INFORMATION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2025	Sep. 27, 2024	Sep. 26, 2025	Sep. 27, 2024
Segment Reporting Information [Line Items]
Total revenue	$ 142,382	$ 195,756	$ 413,544	$ 456,556
Appliance and integration
Segment Reporting Information [Line Items]
Total revenue	97,774	153,685	283,382	329,464
Product sales
Segment Reporting Information [Line Items]
Total revenue	85,048	150,285	257,588	311,642
Professional services
Segment Reporting Information [Line Items]
Total revenue	12,726	3,400	25,794	17,822
SaaS and service
Segment Reporting Information [Line Items]
Total revenue	44,608	42,071	130,162	127,092
SaaS
Segment Reporting Information [Line Items]
Total revenue	16,108	14,182	46,320	41,069
Support services
Segment Reporting Information [Line Items]
Total revenue	$ 28,500	$ 27,889	$ 83,842	$ 86,023

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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