Commitments and Contingencies (Details)																	1 Months Ended		9 Months Ended
		Sep. 14, 2018 patent	Jul. 18, 2018 patent	Jan. 03, 2018 decision	Dec. 21, 2017 decision	Oct. 02, 2017	Jul. 14, 2017 patent	Apr. 19, 2017 patent	Sep. 26, 2016 petition	Aug. 26, 2016 petition defendant	Jul. 01, 2015 patent	Mar. 06, 2015 patent	Dec. 04, 2014 USD ($) claim $ / products	Aug. 22, 2014 patent	Jun. 13, 2013 USD ($) $ / products	Sep. 14, 2010 patent	Jan. 31, 2017 petition	Sep. 30, 2013 patent	Sep. 30, 2018 USD ($) case claim	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Lease expiration date																			Dec. 15, 2028
Property, plant, and equipment																			$ 160,105,000		$ 123,241,000
Build-to-suit lease liability, non-current																			20,600,000
Build-to-suit lease liability, current																			$ 900,000
Number of days for non-cancellation of purchase obligations prior to expected shipment date																			30 days
Non-cancelable purchase commitments with suppliers																			$ 169,100,000
Liabilities recorded for director and officer indemnification agreements																			0
Liabilities recorded for customers, distributors, and resellers indemnification agreements																			$ 0
Period following change of company control executive officer termination entitlements																			12 months
Liabilities for executive's employment agreements																			$ 0
Number of existing cases and proceedings that the Company currently believes are liking to have a material adverse effect on its financial position | claim																			0
The future length the Company currently considered regarding existing cases and proceedings that are likely to have a material adverse effect on it (in months)																			12 months
Earliest Tax Year | Italy
Loss Contingencies [Line Items]
Year under examination																			2004
Latest Tax Year | Italy
Loss Contingencies [Line Items]
Year under examination																			2012
Ericsson v. NETGEAR
Loss Contingencies [Line Items]
Number of patents accused of infringing upon | patent																8
Damages assessed against defendants, per unit equivalent | $ / products															0.15
Damages assessed against defendants, per patent equivalent | $ / products															0.05
Foregone verdict amount													$ 3,600,000
Foregone ongoing royalty verdict amount, per unit | $ / products													0.15
Number of patents jury found infringed | patent																		3
Number of patents jury found infringed for which PTAB invalidated all claims asserted against the Company | patent												3
Ericsson v. NETGEAR | Infringement of U.S. Patent Number 6,466,568
Loss Contingencies [Line Items]
Number of claims jury found infringed | claim													2
Ericsson v. NETGEAR | Infringement of U.S. Patent Number 6,772,215
Loss Contingencies [Line Items]
Number of claims jury found infringed | claim													2
Ericsson v. NETGEAR | D-Link
Loss Contingencies [Line Items]
Damages assessed against defendants															$ 435,000
Ericsson v. NETGEAR | NETGEAR
Loss Contingencies [Line Items]
Damages assessed against defendants															3,555,000
Ericsson v. NETGEAR | Acer Gateway
Loss Contingencies [Line Items]
Damages assessed against defendants															1,170,000
Ericsson v. NETGEAR | Dell
Loss Contingencies [Line Items]
Damages assessed against defendants															1,920,000
Ericsson v. NETGEAR | Toshiba
Loss Contingencies [Line Items]
Damages assessed against defendants															2,445,000
Ericsson v. NETGEAR | Belkin
Loss Contingencies [Line Items]
Damages assessed against defendants															$ 600,000
Via Vadis v. NETGEAR
Loss Contingencies [Line Items]
Number of patents accused of infringing upon | patent														3
Chrismar Systems vs. NETGEAR
Loss Contingencies [Line Items]
Number of patents accused of infringing upon | patent											4
Number of active cases the suing company has | case																			40
Number of defendants | defendant										3
Number of Final Written Decisions | decision				2	4
Period post Final Written Decision to seek rehearing																			30 days
Period post Final Written Decision to file appeal																			63 days
Chrismar Systems vs. NETGEAR | Juniper
Loss Contingencies [Line Items]
Number of IPR petitions | petition									4	4							4
Vivato vs. NETGEAR
Loss Contingencies [Line Items]
Number of patents accused of infringing upon | patent								3
Duration of jury trial set by court						5 days
Hera Wireless vs. NETGEAR
Loss Contingencies [Line Items]
Number of patents accused of infringing upon | patent		6	3				3
Chief Executive Officer
Loss Contingencies [Line Items]
Period of health benefits continuation after termination without cause																			12 months
Vesting period after termination without cause subject to accelerated vesting																			12 months
Annual base salary and target annual bonus multiple for cash severance																			200.00%
Period of health benefits continuation subsequent to change of company control																			24 months
Other Key Executives
Loss Contingencies [Line Items]
Annual base salary and target annual bonus multiple for cash severance																			100.00%
Period of health benefits continuation subsequent to change of company control																			12 months
46 to 60 Days
Loss Contingencies [Line Items]
Percentage of cancelable orders																			50.00%
31 to 45 Days
Loss Contingencies [Line Items]
Percentage of cancelable orders																			25.00%
Minimum | 46 to 60 Days
Loss Contingencies [Line Items]
Required notice period prior to expected shipment date																			46 days
Minimum | 31 to 45 Days
Loss Contingencies [Line Items]
Required notice period prior to expected shipment date																			31 days
Maximum | 46 to 60 Days
Loss Contingencies [Line Items]
Required notice period prior to expected shipment date																			60 days
Maximum | 31 to 45 Days
Loss Contingencies [Line Items]
Required notice period prior to expected shipment date																			45 days
Construction in progress
Loss Contingencies [Line Items]
Property, plant, and equipment	[1]																		$ 21,858,000		$ 0
Scenario, Forecast | Capital Lease Obligations | Arlo Corporate Headquarters Lease
Loss Contingencies [Line Items]
Finance lease, annual expense																				$ 2,900,000

[1] Arlo Technologies, Inc. entered into a build-to-suit lease arrangement in relation to its headquarters in San Jose, California. Refer to Note 10, Commitments and Contingencies, for details of this lease. The construction is expected to be completed in January 2019.