Income Taxes (Schedule Of Deferred Taxes) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
NOL carry-forwards	$ 144,526	$ 137,870
Research and development credit	8,085	8,085
Deferred revenue	3,808	3,808
Stock-based compensation	2,831	2,831
Other	1,276	2,375
Deferred tax assets	160,526	154,969
Investments	(4,889)	(4,953)
Other	(423)	(389)
Net deferred tax asset before valuation allowance	155,214	149,627
Valuation allowance	(155,214)	(149,627)
Net deferred tax assets