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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended
Aug. 21, 2020
Mar. 11, 2015
Mar. 31, 2016
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Other Commitments [Line Items]            
Cash and cash equivalents       $ 2,106,313   $ 2,274,751
Working capital deficit       58,500,000    
Total assets       8,967,281   $ 8,908,887
Cash Lease Obligation       363,850    
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          
Lease rent expense       54,000 $ 41,000  
Common Stock [Member]            
Other Commitments [Line Items]            
Net proceeds received from sale of stock $ 11,300,000          
Corporate Office Space [Member]            
Other Commitments [Line Items]            
Lease Obligation       322,916    
Right Of Use Asset       309,579    
Marine Operations [Member]            
Other Commitments [Line Items]            
Lease Obligation       117,321    
Right Of Use Asset       112,757    
Penelope Mining LLC [Member]            
Other Commitments [Line Items]            
Investment in convertible preferred stock   $ 101,000,000        
Investment agreement period   3 years        
MINOSA [Member]            
Other Commitments [Line Items]            
Amount of debt financed   $ 14,750,000        
Cash Lease Obligation       $ 2,100,000    
Oceanica Resources S. de. R.L [Member]            
Other Commitments [Line Items]            
Grant and potential future issuance of new equity shares     3,000,000.0      
Maximum [Member]            
Other Commitments [Line Items]            
Consultants contingent success fees     $ 700,000