Income Taxes Components of deferred tax asset/ liability (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Components of Deferred Tax Assets and Liabilities [Abstract]
Net operating loss carry forwards	$ 60,961	$ 55,669
Tax credit carry forwards	26,869	24,826
Fixed and intangible assets	7,246	7,486
Capitalized research and development costs	58	58
Reserves and other cumulative temporary differences	19,380	20,910
Gross deferred income tax assets	114,514	108,949
Valuation allowance	(114,514)	(108,949)
Net deferred income tax assets	$ 0	$ 0
Percentage of deferred tax assets on which valuation allowance is created	100.00%	100.00%