Segment Information - Summary Financial Infomation by reportable segments (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 02, 2021 USD ($)	Jun. 26, 2020 USD ($)	Jul. 02, 2021 USD ($) segment	Jun. 26, 2020 USD ($)
Segment Reporting Information [Line Items]
Total net revenue	[1]	$ 113,448	$ 73,994	$ 225,024	$ 152,411
Gross Profit		60,505	37,773	115,650	74,511
Operating income (loss)		2,136	(9,554)	$ (1,708)	(27,603)
Number of Reportable Segments | segment				2
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total net revenue		113,448	73,994	$ 225,024	152,411
Gross Profit		61,109	38,152	117,291	76,473
Operating income (loss)		6,551	(5,115)	11,619	(14,647)
Operating Segments [Member] | Video [Member]
Segment Reporting Information [Line Items]
Total net revenue		63,355	47,453	133,686	101,825
Gross Profit		37,571	26,024	76,345	53,931
Operating income (loss)		1,559	(4,237)	5,331	(10,504)
Operating Segments [Member] | Cable Access [Member]
Segment Reporting Information [Line Items]
Total net revenue		50,093	26,541	91,338	50,586
Gross Profit		23,538	12,128	40,946	22,542
Operating income (loss)		$ 4,992	$ (878)	$ 6,288	$ (4,143)

[1] Revenue is attributed to countries based on the location of the customer.