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Commitments and Contingencies - Additional Information (Detail) - USD ($) shares in Millions | Mar. 11, 2015 | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
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Gain Contingencies [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 2,765,215 | $ 2,241,317 | $ 704,452 | $ 3,143,550
Working capital deficit |  | 19,000,000 |  |  |
Total assets |  | $ 7,244,351 | $ 6,913,016 |  |
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 issuance of new equity shares |  | 3.0 |  |  |

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