Segment Information - Summary Financial Infomation by reportable segments (Details) $ in Thousands		3 Months Ended
		Apr. 02, 2021 USD ($) segment	Mar. 27, 2020 USD ($)
Segment Reporting Information [Line Items]
Total net revenue	[1]	$ 111,576	$ 78,417
Gross Profit		55,145	36,738
Operating income (loss)		$ (3,844)	(18,049)
Number of Reportable Segments | segment		2
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total net revenue		$ 111,576	78,417
Gross Profit		56,182	38,321
Operating income (loss)		5,068	(9,532)
Operating Segments [Member] | Video [Member]
Segment Reporting Information [Line Items]
Total net revenue		70,331	54,372
Gross Profit		38,774	27,907
Operating income (loss)		3,772	(6,267)
Operating Segments [Member] | Cable Access [Member]
Segment Reporting Information [Line Items]
Total net revenue		41,245	24,045
Gross Profit		17,408	10,414
Operating income (loss)		$ 1,296	$ (3,265)

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