Net Income (Loss) Per Share - Schedule of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended								5 Months Ended	7 Months Ended		12 Months Ended
	Aug. 02, 2018	Dec. 31, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Aug. 02, 2018	Aug. 02, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock issued during period, common stock (in shares)	62,499										62,500
Numerator:
Net loss		$ (15,210)	$ (17,459)	$ (29,256)	$ (39,326)	$ 19,615	$ (30,590)	$ (33,692)	$ (41,284)	$ (45,849)		$ (29,634)	$ (101,251)	$ (85,951)	$ (75,483)
Denominator:
Weighted average common shares - basic (in shares)													78,084	75,074	67,231
Potentially dilutive common shares (in shares)													0	0	0
Stock option and RSU conversion (in shares)													0	0	0
Weighted average common shares - dilutive (in shares)													78,084	75,074	67,231
Basic net loss per share (in dollars per share)		$ (0.19)	$ (0.22)	$ (0.38)	$ (0.51)	$ 0.26	$ (0.41)	$ (0.45)	$ (0.55)				$ (1.30)	$ (1.14)	$ (1.12)
Diluted net loss per share (in dollars per share)		$ (0.19)	$ (0.22)	$ (0.38)	$ (0.51)	$ 0.26	$ (0.41)	$ (0.45)	$ (0.55)				$ (1.30)	$ (1.14)	$ (1.12)
Anti-dilutive employee stock-based awards, excluded (in shares)													5,623	9,692	1,109
2018 Plan | NETGEAR
Denominator:
Converted at Distribution (in shares)										6,800					6,800