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Accounts Receivable - Summary of Current and Non-current Accounts Receivable (Detail) - USD ($) | Sep. 30, 2015 | Dec. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Reserve for doubtful accounts receivable | $ (4,631,593) | $ (4,631,593)
Total accounts receivable, net | 6,887,246 | 6,476,049
Trade [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, gross | 11,429,856 | 11,053,118
Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, gross | $ 88,983 | $ 54,524

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