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Commitments and Contingencies - Additional Information (Detail) - USD ($) shares in Millions |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 11, 2015 | Mar. 31, 2016 | Jun. 30, 2019 | Dec. 31, 2018
Gain Contingencies [Line Items] |  |  |  |
Cash and cash equivalents |  |  | $ 372,486 | $ 2,786,832
Working capital deficit |  |  | 44,000,000 |
Total assets |  |  | 2,496,226 | $ 5,473,170
Cash Lease Obligation |  |  | $ 751,099 |
Building [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Effective Date Of Operating Lease Agreement |  |  | Aug. 01, 2019 |
Cash Lease Obligation |  |  | $ 751,099 |
Lease Obligation |  |  | $ 590,612 |
Rate Of Discount Used |  |  | 10.00% |
Tenure Of Lease Agreement |  |  | 5 years |
Right Of Use Asset |  |  | $ 590,612 |
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 |  |
Maximum [Member] | Building [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Monthly Lease Payments |  |  | 13,269 |
Minimum [Member] | Building [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Monthly Lease Payments |  |  | $ 11,789 |

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