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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 21, 2020
Mar. 11, 2015
Mar. 31, 2016
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Oct. 01, 2016
Gain Contingencies [Line Items]                    
Cash and cash equivalents       $ 3,543,036     $ 3,543,036   $ 6,163,205  
Working capital deficit       57,200,000     57,200,000      
Total assets       9,395,842     9,395,842   $ 11,759,464  
Cash Lease Obligation       438,895     438,895      
Lease Obligation       380,134     380,134      
Right Of Use Asset       $ 366,862     $ 366,862      
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           $ 0 $ 11,315,000    
Lease rent expense       $ 41,000 $ 54,000   122,000 $ 162,000    
Loss contingency accrual, payments             3,000,000.0      
Gain (Loss) related to litigation settlement             0      
Debt instrument face amount                   $ 3,000,000.0
Termination And Settlement Agreement [Member]                    
Gain Contingencies [Line Items]                    
Debt instrument face amount       14,500,000     14,500,000      
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       $ 136,609     $ 136,609      
Tenure Of Lease Agreement       5 years     5 years      
Right Of Use Asset       $ 132,068     $ 132,068      
FLORIDA                    
Gain Contingencies [Line Items]                    
Effective Date Of Operating Lease Agreement             Oct. 01, 2019      
Cash Lease Obligation       158,999     $ 158,999      
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       $ 3,500,000     3,500,000      
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