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Income Taxes - Schedule of Company's Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 81,944 | $ 73,129
Research and development tax credit carryforwards | 7,996 | 6,770
Capitalized research |  | 5
Stock-based compensation | 7,927 | 7,375
Deferred Revenue | 3,563 |
Other | 1,677 | 937
Total deferred tax asset | 103,107 | 88,216
Valuation allowance | (103,107) | (88,216)
Net deferred tax assets |  |
Liabilities: |  |
Net deferred tax liability related to intangible assets | (748) |
Total deferred tax liability | $ (748) |

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