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Tonogold Resources Inc. ("Tonogold") Purchase, Lease, and Option Agreements (Details) - USD ($)
9 Months Ended
Sep. 08, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]        
Cash   $ 1,140,000 $ 3,925,000  
Notes receivable at fair value $ 6,100,000 6,400,000    
Contingent forward asset - fair value on settlement date (2,000,000.0)      
Tonogold Resources, Inc.        
Schedule of Equity Method Investments [Line Items]        
Cash 7,065,000      
Equity securities 7,607,263 9,722,022   $ 0
Notes receivable at fair value 6,141,497      
Contingent forward asset - fair value on settlement date (1,998,832)      
Consideration received 18,814,928      
Net carrying value Comstock Mining LLC (539,082) $ 0   $ (9,080,000)
Net gain on sale $ 18,275,846