Balance Sheet Components (Schedule of Property and Equipment, Net) (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Total property and equipment, gross		$ 160,105	$ 123,241
Accumulated depreciation and amortization		(103,458)	(102,581)
Total property and equipment, net		56,647	20,660
Computer equipment
Total property and equipment, gross		13,127	10,114
Furniture, fixtures and leasehold improvements
Total property and equipment, gross		21,811	21,640
Software
Total property and equipment, gross		36,883	28,997
Machinery and equipment
Total property and equipment, gross		66,426	62,490
Construction in progress
Total property and equipment, gross	[1]	$ 21,858	$ 0

[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.