Other Financial Statement Data (Schedule Of Changes In Estimated Warranty Liability) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Other Financial Statement Data [Abstract]
Balance at beginning of period	$ 985	$ 702
Accrual for warranties	745	1,273
Warranty revision	(2)	(15)
Settlements made during the period	(1,034)	(975)
Balance at end of period	$ 694	$ 985