Discontinued Operations (Income (Loss) From Discontinued Operations, Net Of Tax) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating expenses:
Total operating expenses	$ 6,300
Income (loss) from discontinued operations, net of tax		$ 0	$ (35,655)	$ 30,569
Arlo | Discontinued Operations, Disposed of by Spin-off
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue			464,649	367,751
Cost of net revenue			372,843	279,425
Gross profit			91,806	88,326
Operating expenses:
Research and development			48,696	22,710
Sales and marketing			39,713	19,490
General and administrative			17,762	691
Separation expense			31,583	1,384
Litigation reserves, net			0	28
Total operating expenses			137,754	44,303
Income (loss) from operations of discontinued operations			(45,948)	44,023
Interest income, net			1,239	0
Other income (expense), net			(41)	467
Income (loss) from discontinued operations before income taxes			(44,750)	44,490
Provision (benefit) for income taxes			(9,095)	13,921
Income (loss) from discontinued operations, net of tax			$ (35,655)	$ 30,569