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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 |  |  |

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