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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 85,912 | $ 81,127
Research credit carryforwards | 13,481 | 12,750
Other, net | 3,962 | 4,190
Deferred revenue | 2,116 | 5,749
Total deferred tax assets | 105,471 | 103,816
Valuation allowance | (105,471) | (103,816)
Net deferred tax assets | $ 0 | $ 0

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