Other Financial Statement Data (Schedule Of Changes In Estimated Warranty Liability) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 645	$ 839
Accrual for warranties	447	287
Warranty revision	(25)	10
Settlements made during the period	(295)	(426)
Balance at end of period	772	710
Current portion of estimated warranty liability	(685)	(635)	$ (584)
Long-term estimated warranty liability	$ 87	$ 75