Other Financial Statement Data (Schedule Of Changes In Deferred Warranty Revenue) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Movement in Extended Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 445	$ 344
Revenue deferrals	253	268
Amortization of deferred revenue	(244)	(221)
Total deferred warranty revenue	454	391
Current portion of deferred warranty revenue	(354)	(301)
Long-term deferred warranty revenue	$ 100	$ 90