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Loans Payable - Note 5 - SMOM - Additional Information (Detail) - Note 5 - SMOM [Member] - USD ($) |  | 3 Months Ended
--- | --- | ---
Mar. 04, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Debt Instrument [Line Items] |  |  |
Aggregate amount issuable | $ 3,000,000 |  |
Loan balance |  | $ 3,000,000 |
Interest rate, stated percentage | 10.00% |  |
Annual Principal Payment | $ 500,000 |  |
Accrued interest |  | $ 73,972 | $ 8,836
Neptune Minerals, Inc. [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Accounts receivable assigned for loan | 50.00% |  |
Accounts receivable, gross | $ 0 |  |
Aldama Mining Company, S.de R.L. de C.V [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of equity interest | 10.00% |  |
Value of equity interest | $ 1,000,000 |  |
Aldama Mining Company, S.de R.L. de C.V [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of equity interest | 50.00% |  |

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