Other Financial Statement Data (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,622	$ 10,509
Accumulated Amortization	(10,433)	(10,279)
Net	189	230
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,775	7,775
Accumulated Amortization	(7,775)	(7,775)
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,847	2,734
Accumulated Amortization	(2,658)	(2,504)
Net	$ 189	$ 230