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Income Taxes (Additional Information) (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Tax Credit Carryforward [Line Items] |  |
Federal operating loss carryforwards | $ 83,900,000 |
State operating loss carryforwards | 49,800,000 |
Operating loss carryforwards, exercise of stock options | 280,000 |
Decrease in deferred tax assets | 109,000 |
Deferred income tax valuation |  | 100.00%
Increase in valuation allowance | 12,500,000 | 5,100,000
Domestic Tax Authority [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Research and development tax credit carryforwards | 2,200,000 |
State and Local Jurisdiction [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Research and development tax credit carryforwards | $ 2,000,000 |

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