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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 |  |

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