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Commitments and Contingencies - Additional Information (Detail) - USD ($) shares in Millions |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 11, 2015 | Mar. 31, 2016 | Jun. 30, 2018 | Dec. 31, 2017
Gain Contingencies [Line Items] |  |  |  |
Cash and cash equivalents |  |  | $ 565,842 | $ 1,108,193
Working capital deficit |  |  | $ 35,000,000 |
Penelope Mining LLC [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Investment in convertible preferred stock | $ 101,000,000 |  |  |
Investment agreement period | 3 years |  |  |
MINOSA [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Amount of debt financed | $ 14,750,000 |  |  |
Oceanica Resources S. de. R.L [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Grant and potential future issuance of new equity shares |  | 3.0 |  |
Maximum [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Consultants contingent success fees |  | $ 425,000 |  |

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