Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets
Net operating losses	$ 37,571	$ 39,977
Stock-based compensation	6,471	8,998
Fixed Assets	286	236
Deferred rent liability	68	132
Other	82	79
Total deferred tax assets	44,478	49,422
Less: valuation allowance	(44,478)	(49,422)
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 before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred rent.

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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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