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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Net operating loss carryforwards	$ 73,129	$ 67,395
Research and development tax credit carryforwards	6,770	6,844
Capitalized research	5	117
Stock-based compensation	7,375	7,355
Other	937	1,125
Total Deferred Assets	88,216	82,836
Valuation allowance	(88,216)	(82,836)
Net deferred tax assets

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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