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Income Taxes - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Income Tax Disclosure [Line Items] | |||
| Valuation Allowance | $ 24,875,049 | $ 19,195,192 | |
| Net change in valuation allowance related to deferred tax assets | 5,679,857 | 4,879,978 | |
| Change in ownership | 50.00% | ||
| Annual amount of pre-change net operating losses | 417,000 | ||
| Additional unrecognized tax benefits | 361,143 | 329,676 | |
| Tax positions | 1,241,781 | 880,638 | 550,962 |
| Interest and penalties | 0 | 0 | |
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Research and Development Tax Credit [Member]
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| Income Tax Disclosure [Line Items] | |||
| Federal research and development tax credit carryforwards | 1,242,000 | ||
| Federal tax credit carryforward | 2023 | ||
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Federal and State Tax [Member]
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| Income Tax Disclosure [Line Items] | |||
| Federal and state tax net operating loss carryforwards | $ 64,151,000 | ||
| Federal and state tax loss carryforward expiration date | 2033 | ||
| X | ||||||||||
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- Definition
Federal and state operating tax loss carry forwards expiration in years. No definition available.
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- Details
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| X | ||||||||||
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- Definition
Net operating loss carryforward limitation on use percentage ownership change minimum. No definition available.
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- Definition
Net operating loss carryforwards pre change annual limitation. No definition available.
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- Definition
Tax credit carry forward expiration year. No definition available.
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| X | ||||||||||
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- Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of the change in the period in the valuation allowance for a specified deferred tax asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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