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Tonogold Option Agreement (Details) - USD ($)
6 Months Ended
Apr. 03, 2018
Oct. 03, 2017
Jun. 30, 2018
Apr. 03, 2021
Schedule of Equity Method Investments [Line Items]        
Expense reimbursements     $ 300,000  
Tonogold Resources, Inc.        
Schedule of Equity Method Investments [Line Items]        
Payments made to the company $ 2,000,000      
Comstock Mining LLC | Scenario, Forecast | Tonogold Resources, Inc.        
Schedule of Equity Method Investments [Line Items]        
Percentage interest in subsidiary       51.00%
Lucerne Property | Tonogold Resources, Inc.        
Schedule of Equity Method Investments [Line Items]        
Required Payments To Acquire Equity Method Investments   $ 2,200,000    
Payments made to the company 2,000,000 200,000    
Lucerne Property | Land Improvements | Tonogold Resources, Inc.        
Schedule of Equity Method Investments [Line Items]        
Required capital expenditures   $ 20,000,000    
Required capital expenditure, maximum period   42 months    
Senior Secured Debenture due 2021 | Secured Debt        
Schedule of Equity Method Investments [Line Items]        
Proceeds used to reduce indebtedness $ 1,500,000