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Agreements with Tonogold (Details)
 3 Months Ended
Jun. 07, 2019
USD ($)
May 22, 2019
USD ($)
May 03, 2019
USD ($)
Apr. 09, 2019
USD ($)
Jan. 24, 2019
USD ($)
$ / T
Apr. 03, 2018
USD ($)
Oct. 03, 2017
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Apr. 03, 2021
Apr. 30, 2019
USD ($)
payment
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]                        
Net smelter return percentage on properties               3.00%        
Proceeds non-refundable deposits               $ 1,950,000 $ 0      
Purchase of membership interests                 0      
Value of preferred stock issued               0       $ 0
Expense reimbursements               $ 200,000 $ 200,000      
Tonogold Agreement                        
Schedule of Equity Method Investments [Line Items]                        
Proceeds from sale of wholly-owned subsidiary         $ 15,000,000              
Tonogold Agreement, Alternate Arrangement | Remainder of Purchase Price Payment, Option One                        
Schedule of Equity Method Investments [Line Items]                        
Proceeds from sale of wholly-owned subsidiary         $ 11,500,000              
Lucerne Property | Tonogold Agreement                        
Schedule of Equity Method Investments [Line Items]                        
Net smelter return percentage on properties         1.50%              
Storey County, Nevada | Tonogold Agreement                        
Schedule of Equity Method Investments [Line Items]                        
Net smelter return percentage on properties         3.00%              
Term of mineral lease         10 years              
Annual costs incurred to explore, develop and mine properties         $ 100,000              
Exploration and development work commitments         $ 200,000              
Net smelter return royalty percentage, after year one         1.50%              
Renewal term of mineral lease         10 years              
American Flat Property | Tonogold Option Agreement | Phase 1                        
Schedule of Equity Method Investments [Line Items]                        
Annual reimbursements under facility lease         $ 1,100,000              
Annual rental income under processing facility         $ 1,000,000              
Rental fee per ton processed | $ / T         1              
Potential rental income under processing facility lease         $ 15,000,000              
American Flat Property | Tonogold Option Agreement | Phase 2                        
Schedule of Equity Method Investments [Line Items]                        
Annual rental income under processing facility         $ 1,000,000              
Rental fee per ton processed | $ / T         0.50              
Potential rental income under processing facility lease         $ 10,000,000              
Tonogold Resources, Inc.                        
Schedule of Equity Method Investments [Line Items]                        
Payments made to the company           $ 2,000,000            
Tonogold Resources, Inc. | Tonogold Agreement, Alternate Arrangement                        
Schedule of Equity Method Investments [Line Items]                        
Proceeds from purchase agreements in form of convertible debt         $ 3,500,000              
Tonogold Resources, Inc. | Lucerne Property                        
Schedule of Equity Method Investments [Line Items]                        
Option payments             $ 2,200,000          
Payments made to the company           $ 2,000,000 200,000          
Tonogold Resources, Inc. | Lucerne Property | Land Improvements                        
Schedule of Equity Method Investments [Line Items]                        
Future spending commitments             $ 20,000,000          
Required capital expenditure, maximum period             42 months          
Tonogold Resources, Inc. | Comstock Mining LLC | Scenario, Forecast                        
Schedule of Equity Method Investments [Line Items]                        
Percentage interest in subsidiary                   51.00%    
Subsequent Event                        
Schedule of Equity Method Investments [Line Items]                        
Expense reimbursements       $ 200,000                
Subsequent Event | Tonogold Agreement                        
Schedule of Equity Method Investments [Line Items]                        
Remaining proceeds to be received $ 9,150,000                      
Proceeds non-refundable deposits $ 2,400,000   $ 2,400,000                  
Subsequent Event | Tonogold Agreement, Amendment Agreement                        
Schedule of Equity Method Investments [Line Items]                        
Number of additional payments to be received (in payments) | payment                     3  
Receivable for non-refundable deposits                     $ 1,000,000  
Subsequent Event | Tonogold Resources, Inc. | Tonogold Agreement, Second Amendment                        
Schedule of Equity Method Investments [Line Items]                        
Value of preferred stock issued   $ 400,000                    
Subsequent Event | Tonogold Resources, Inc. | Lucerne Property                        
Schedule of Equity Method Investments [Line Items]                        
Reversal of cash payments required to be paid   $ 700,000