Other Financial Statement Data (Schedule Of Changes In Estimated Warranty Liability) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 991	$ 839
Accrual for warranties	261	272
Warranty revision	64	(40)
Settlements made during the period	(233)	(181)
Balance at end of period	1,083	890
Current portion of estimated warranty liability	(1,027)	(851)	$ (949)
Long-term estimated warranty liability	$ 56	$ 39