Other Financial Statement Data (Schedule Of Changes In Deferred Warranty Revenue) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Other Financial Statement Data [Abstract]
Balance at beginning of period	$ 582	$ 806
Revenue deferrals	299	230
Amortization of deferred revenue	(437)	(454)
Total deferred warranty revenue	444	582
Current portion of deferred warranty revenue	(279)	(436)
Long-term deferred warranty revenue	$ 165	$ 146