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Income Taxes (Additional Information) (Detail) (USD $)	12 Months Ended
Income Taxes (Additional Information) (Detail) (USD $)	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

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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