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Commitments and Contingencies - Additional Information (Detail) - USD ($) shares in Millions | Mar. 11, 2015 | Oct. 01, 2016 | Sep. 30, 2016 | Apr. 11, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014 | May 10, 2012
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Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Required minimum market capitalization value |  |  |  | $ 35,000,000 |  |  |  |  |
Cash and cash equivalents |  |  | $ 529,487 |  |  | $ 2,241,317 | $ 1,840,401 | $ 3,143,550 |
Working capital deficit |  |  | 22,300,000 |  |  |  |  |  |
Total assets |  |  | $ 4,786,651 |  |  | $ 6,913,016 |  |  |
Aggregate amount of Notes |  |  |  |  |  |  |  |  | $ 8,000,000
MINOSA [Member] | Epsilon Acquisitions, LLC [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Aggregate amount of Notes |  | $ 6,000,000 |  |  |  |  |  |  |
Aggregate amount of notes, received |  | $ 4,000,000 |  |  |  |  |  |  |
Penelope Mining LLC [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Investment in convertible preferred stock | $ 101,000,000 |  |  |  |  |  |  |  |
Investment agreement period | 3 years |  |  |  |  |  |  |  |
Oceanica Resources S. de. R.L [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Grant and issuance of new equity shares |  |  |  |  | 3.0 |  |  |  |

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