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Accounts Receivable - Additional Information (Detail) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Reserves for doubtful accounts | $ 2,315,797 | $ 2,315,797
Monaco [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | 501,228 | $ 629,400
Neptune Minerals, Inc. [Member] | Monaco [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of accounts receivable |  | 50.00%
Reserves for doubtful accounts | 2,315,797 | $ 2,315,797
Other Customer [Member] | Monaco [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Reserves for doubtful accounts | $ 1,018,732 | $ 1,018,732

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