Discontinued Operations (Loss From Discontinued Operations, Net Of Tax) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating expenses:
Total operating expenses	$ 6,300
Loss from discontinued operations, net of tax		$ 0	$ 0	$ (35,655)
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
Cost of net revenue				372,843
Gross profit				91,806
Operating expenses:
Research and development				48,696
Sales and marketing				39,713
General and administrative				17,762
Separation expense				31,583
Total operating expenses				137,754
Loss from operations of discontinued operations				(45,948)
Interest income				1,239
Other income (expense), net				(41)
Loss from discontinued operations before income taxes				(44,750)
Benefit for income taxes				(9,095)
Loss from discontinued operations, net of tax				$ (35,655)