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Income Taxes - Schedule of Change in Valuation Allowance (Detail) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |
Valuation allowance | $ 65,093,249 | $ 64,553,394
Change in valuation allowance | $ 539,855 |

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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Period Type: | instant

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Period Type: | duration

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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e32123-109318 + Details
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Namespace Prefix: | us-gaap_
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