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Investments In Unconsolidated Entities - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2017
Dec. 31, 2012
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]        
Investment carrying value $ 1,500,000     $ 1,500,000
Greg Stemm [Member]        
Schedule of Equity Method Investments [Line Items]        
Investment carrying value $ 1,500,000     $ 1,500,000
Chatham Rock Phosphate, Ltd. [Member]        
Schedule of Equity Method Investments [Line Items]        
Investment carrying value     $ 0  
Deep sea mining exploratory services     $ 1,680,000  
Shares received from CRP   141,884 9,320,348  
Outstanding equity stake in CRP   1.00%    
Neptune Minerals, Inc. [Member]        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage 14.00%      
Investment carrying value $ 0      
Neptune Minerals, Inc. [Member] | Common Class B Non Voting Shares [Member]        
Schedule of Equity Method Investments [Line Items]        
Current investment position in NMI 3,092,488      
Aggregate number of shares converted 261,200      
Neptune Minerals, Inc. [Member] | Series A Preferred Non Voting Shares [Member]        
Schedule of Equity Method Investments [Line Items]        
Current investment position in NMI 2,612      
Dorado Ocean Resources, Ltd. [Member]        
Schedule of Equity Method Investments [Line Items]        
Loss from unconsolidated entity $ 21,300,000