SEGMENT INFORMATION - Schedule of Financial Information by Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Sep. 25, 2020	Oct. 01, 2021	Sep. 25, 2020
Segment Reporting Information [Line Items]
Revenue	$ 126,321	$ 94,892	$ 351,345	$ 247,303
Gross profit	66,154	48,924	181,804	123,435
Operating income (loss)	5,371	(1,621)	3,663	(29,224)
Operating segments
Segment Reporting Information [Line Items]
Revenue	126,321	94,892	351,345	247,303
Gross profit	66,699	49,507	183,990	125,980
Operating income (loss)	11,807	4,177	23,426	(10,470)
Operating segments | Video
Segment Reporting Information [Line Items]
Revenue	68,729	54,641	202,415	156,466
Gross profit	42,534	29,825	118,879	83,756
Operating income (loss)	7,904	(1,699)	13,235	(12,203)
Operating segments | Cable Access
Segment Reporting Information [Line Items]
Revenue	57,592	40,251	148,930	90,837
Gross profit	24,165	19,682	65,111	42,224
Operating income (loss)	$ 3,903	$ 5,876	$ 10,191	$ 1,733