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Commitments and Contingencies - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 21, 2020 | Mar. 11, 2015 | Mar. 31, 2016 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 4,786,353 |  |  | $ 4,786,353 |  | $ 6,163,205
Working capital deficit |  |  |  | 54,800,000 |  |  | 54,800,000 |  |
Total assets |  |  |  | 10,595,302 |  |  | 10,595,302 |  | $ 11,759,464
Cash Lease Obligation |  |  |  | 476,053 |  |  | 476,053 |  |
Lease Obligation |  |  |  | 407,331 |  |  | 407,331 |  |
Right Of Use Asset |  |  |  | $ 394,457 |  |  | $ 394,457 |  |
Annual increases of base rent |  |  |  | 3.00% |  |  | 3.00% |  |
Sale of stock, Number of shares issued in transaction | 2,553,314 |  |  |  |  |  |  |  |
Class of warrant or right, Number of securities called by warrants or rights | 1,901,985 |  |  |  |  |  |  |  |
Offering costs paid on sale of common stock | $ 300,000 |  |  |  |  |  |  |  |
Net proceeds received from sale of stock | 11,300,000 |  |  |  |  |  |  |  |
Lease rent expense |  |  |  | $ 41,000 | $ 54,000 |  | $ 81,000 | $ 108,000 |
Loss contingency accrual, payments |  |  |  |  |  |  | 3,000,000.0 |  |
Gain (Loss) related to litigation settlement |  |  |  |  |  |  | 0 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds received from sale of stock | $ 11,300,000 |  |  |  |  |  |  |  |
Building [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Lease Obligation |  |  |  | $ 590,612 |  |  | $ 590,612 |  |
Rate Of Discount Used |  |  |  | 10.00% |  |  | 10.00% |  |
Right Of Use Asset |  |  |  | $ 590,612 |  |  | $ 590,612 |  |
Corporate Office Space [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Lease Obligation |  |  |  | $ 145,530 |  |  | $ 145,530 |  |
Tenure Of Lease Agreement |  |  |  | 5 years |  |  | 5 years |  |
Right Of Use Asset |  |  |  | $ 141,375 |  |  | $ 141,375 |  |
FLORIDA |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Effective Date Of Operating Lease Agreement |  |  |  |  |  |  | Oct. 01, 2019 |  |
Cash Lease Obligation |  |  |  | 171,485 |  |  | $ 171,485 |  |
Lease Obligation |  |  |  | $ 202,424 |  |  | $ 202,424 |  |
Rate Of Discount Used |  |  |  | 10.00% |  |  | 10.00% |  |
Tenure Of Lease Agreement |  |  |  | 5 years |  |  | 5 years |  |
Right Of Use Asset |  |  |  | $ 202,424 |  |  | $ 202,424 |  |
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 |  |  |  |  |  |  |
Cash Lease Obligation |  |  |  | $ 4,800,000 |  |  | 4,800,000 |  |
Oceanica Resources S. de. R.L [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Grant and potential future issuance of new equity shares |  |  | 3,000,000.0 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Consultants contingent success fees |  |  | $ 700,000 |  |  |  |  |  |
Maximum [Member] | Building [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Monthly Lease Payments |  |  |  |  |  |  | 13,269 |  |
Maximum [Member] | FLORIDA |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Monthly Lease Payments |  |  |  |  |  | $ 4,547 |  |  |
Minimum [Member] | Building [Member] |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Monthly Lease Payments |  |  |  |  |  |  | $ 11,789 |  |
Minimum [Member] | FLORIDA |  |  |  |  |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Monthly Lease Payments |  |  |  |  |  | $ 4,040 |  |  |

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