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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Tax [Line Items] |  |  |  |
Federal income tax rate | 34.00% | 34.00% | 34.00% |
Valuation allowance | $ 18,067,789 | $ 15,038,936 | $ 14,414,582 |
Percentage of change in ownership for operating loss carry forward |  |  |  | 50.00%
Annual limitation on use of pre -ownership changes losses | 284,000 |  |  |
Net operating loss carryforwards | 36,200,000 |  |  |
Carryforward period of ownership | 20 years |  |  |
Utilize pre-ownership change losses | 5,600,000 |  |  |
Write-off deferred tax assets |  |  | 10,400,000 |
Federal net operating loss carryforwards expiration year start | 2020 |  |  |
U.S Federal [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carryforwards | $ 19,100,000 |  |  |

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