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Agreements with Tonogold (Details) |  |  |  |  |  |  |  | 3 Months Ended |  |  |
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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 |  |  |  |  |  |  |  |  |  |

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