Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 58,293	$ 25,791	$ (18,329)
Other comprehensive income (loss), before tax:
Change in unrealized gains and losses on derivatives	(64)	30	834
Change in unrealized gains and losses on available-for-sale investments	0	16	128
Other comprehensive income (loss), before tax	(64)	46	962
Tax benefit (provision) related to derivatives	8	(6)	(76)
Tax benefit (provision) related to available-for-sale investments	0	(4)	(50)
Other comprehensive income (loss), net of tax	(56)	36	836
Comprehensive income (loss)	58,237	25,827	(17,493)
Comprehensive loss attributable to non-controlling interest, net of tax	0	0	(9,165)
Comprehensive income (loss) attributable to NETGEAR, Inc.	$ 58,237	$ 25,827	$ (8,328)