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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 |  |  |

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