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Commitments and Contingencies - Additional Information (Detail) - USD ($) shares in Millions |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 11, 2015 | Mar. 31, 2016 | Feb. 28, 2011 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 09, 2002 | May 26, 1998
Gain Contingencies [Line Items] |  |  |  |  |  |  |
Income derived from Cambridge RPC's |  |  |  | $ 12,986 |  |  |
Post finance cost proceeds |  |  |  |  |  | 5.00% | 5.00%
Consultants contingent success fees |  |  |  | 230,500 |  |  |
Cash and cash equivalents |  |  |  | 2,786,832 | $ 1,108,193 |  |
Working capital deficit |  |  |  | 37,400,000 |  |  |
Total assets |  |  |  | 5,473,170 | $ 2,972,426 |  |
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 |  |  |  |  |  |
Bank loan amount |  |  |  | $ 14,750,000 |  |  |
Bank loan maturity date |  |  |  | Dec. 31, 2018 |  |  |
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 |  |  |  |  |
Maximum [Member] | Galt Resources [Member] |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |
Investment for future revenue rights |  |  | $ 7,512,500 |  |  |  |
Seattle and Cambridge Projects [Member] |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |
Deferred income from revenue participation rights |  |  |  | $ 887,500 |  |  |

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