Balance Sheet Components (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Total property and equipment, gross	$ 116,108	$ 116,769
Accumulated depreciation and amortization	(95,931)	(99,420)
Total property and equipment, net	20,177	17,349	$ 18,147
Computer equipment
Total property and equipment, gross	9,205	10,065
Furniture, fixtures and leasehold improvements
Total property and equipment, gross	18,286	21,464
Software
Total property and equipment, gross	28,065	28,817
Machinery and equipment
Total property and equipment, gross	$ 60,552	$ 56,423