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Fair Value Measurements - Narrative (Details) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 14 Months Ended |  |  |  |  |  |  |  |  |  |
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Sep. 29, 2020 USD ($) $ / shares shares | Sep. 08, 2020 USD ($) $ / shares | Sep. 01, 2020 | Jul. 22, 2020 shares | May 22, 2020 USD ($) $ / shares shares | Apr. 24, 2020 | Jul. 18, 2019 USD ($) shares | Apr. 30, 2020 | Jan. 31, 2018 | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) | Sep. 30, 2019 shares | May 15, 2020 shares | Mar. 20, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 30, 2019 USD ($) | Dec. 19, 2019 USD ($) | Nov. 18, 2019 USD ($) | Oct. 14, 2019 USD ($) | Aug. 30, 2019 USD ($) | Jun. 30, 2019 shares | May 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of convertible preferred stock |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  |  | $ 0 |  |  |  |  |  |  |
Change in estimated fair value of Tonogold shares |  |  |  |  |  |  |  |  |  | $ (53,610) |  | $ (332,263) | 1,282,319 | $ (332,263) |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock exchanged, amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Tonogold preferred shares (in shares) | shares |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  | 0 |  |  |  |  |  | 1,274 |
Common shares of Tonogold (in shares) | shares |  |  |  | 2,040,483 |  |  |  |  |  | 34,440,766 |  |  | 34,440,766 |  |  |  |  | 27,236,489 |  |  |  |  |  |  |
Number of shares sold (in shares) | shares |  |  |  | 2,040,483 |  |  |  |  |  | 3,450,138 |  |  |  |  | 2,327,400 |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  | 34,440,766 |  |  | 34,440,766 |  |  |  |  | 27,236,489 |  |  |  |  |  |  |
Principal amount |  | $ 4,475,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable at fair value |  | $ 6,100,000 |  |  |  |  |  |  |  | $ 6,400,000 |  |  | $ 6,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Change in estimated fair value of contingent asset |  |  |  |  |  |  |  |  |  | 647,502 |  | 0 | (765,880) | 0 |  |  |  |  |  |  |  |  |  |  |
Stock based investment |  |  |  |  |  |  |  |  |  | 100,000 |  |  | 100,000 |  |  |  |  | $ 0 |  |  |  |  |  |  |
Make-whole liability |  |  |  |  |  |  |  |  |  | 0 | $ 384,873 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt at fair value |  |  |  |  |  |  |  |  |  | 4,800,000 |  |  | 4,800,000 |  |  |  |  | 5,400,000 |  |  |  |  |  |  |
Pelen LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Membership interest |  |  |  |  |  | 25.00% |  | 25.00% | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in estimated fair value of contingent asset |  |  |  |  |  |  |  |  |  | (300,000) |  |  | (300,000) |  |  |  |  |  |  |  |  |  |  |  |
Tonogold Resources, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of convertible preferred stock |  |  |  |  |  |  |  |  |  | $ 6,100,000 |  |  | $ 6,100,000 |  |  |  |  | 6,100,000 |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |
Convertible Debt | Tonogold Resources, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 4,475,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,475,000 |  |  |  |  |  |  |  |
Private Placement Conversion Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input | $ / shares |  |  |  |  |  |  |  |  |  | 0.18 |  |  | 0.18 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of 20-Day Volume-Weighted Closing Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input |  |  |  |  | 0.85 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tonogold Resources, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing stock price (in dollars per share) | $ / shares | $ 0.18 |  |  |  | $ 0.18 |  |  |  |  | $ 0.39 |  |  | $ 0.39 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of convertible preferred stock |  |  |  |  | $ 7,600,000 |  |  |  |  | $ 2,600,000 |  |  | $ 2,600,000 |  |  |  |  | 6,100,000 | $ 100,000 | $ 500,000 | $ 7,600,000 | $ 750,000 | $ 830,000 |  | $ 3,920,000
Change in estimated fair value of Tonogold shares |  |  |  |  |  |  |  |  |  | $ (2,500,000) |  | $ (300,000) | $ (2,500,000) | $ (300,000) |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock exchanged, amount | $ 2,820,000 |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tonogold preferred shares (in shares) | shares | 2,820 |  |  |  | 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares of Tonogold (in shares) | shares | 15,666,667 |  |  |  | 6,111,111 |  |  |  |  | 21,777,778 |  |  | 21,777,778 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 3,557,209 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  | 18,220,569 |  |  | 18,220,569 |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable at fair value |  | $ 6,141,497 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in estimated fair value of contingent asset |  |  |  |  |  |  |  |  |  |  |  |  | $ (300,000) |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value percentage |  |  |  |  |  |  |  |  |  | 1.20 |  |  | 1.20 |  |  |  |  |  |  |  |  |  |  |  |
Tonogold Resources, Inc. | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,475,000 |  |  |  |  |  |  |  |
Interest rate |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tonogold Resources, Inc. | Convertible Debt | Change Of Control, Redemption Right |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  | 125.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tonogold Resources, Inc. | Convertible Debt | Default Redemption Right |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  | 118.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tonogold Resources, Inc. | Estimate of Fair Value Measurement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,600,000 |  |  |  |  |  |  |
Tonogold Resources, Inc. | Common Share Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input | $ / shares |  | 0.35 |  |  |  |  |  |  |  | 0.39 |  |  | 0.39 |  |  |  | 0.35 |  |  |  |  |  |  |  |
Tonogold Resources, Inc. | Volatility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input |  | 0.96 |  |  |  |  |  |  |  | 0.96 |  |  | 0.96 |  |  |  | 0.960 |  |  |  |  |  |  |  |
Tonogold Resources, Inc. | Risk-Free Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input |  | 0.0015 |  |  |  |  |  |  |  | 0.0015 |  |  | 0.0015 |  |  |  | 0.0015 |  |  |  |  |  |  |  |
Tonogold Resources, Inc. | Cost of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input |  | 0.1112 |  |  |  |  |  |  |  | 0.1112 |  |  | 0.1112 |  |  |  | 0.1112 |  |  |  |  |  |  |  |
Tonogold Resources, Inc. | Private Placement Conversion Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input | $ / shares |  | 0.30 |  |  |  |  |  |  |  | 0.30 |  |  | 0.30 |  |  |  | 0.300 |  |  |  |  |  |  |  |
Tonogold Resources, Inc. | Probability of Prepayment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input | $ / shares |  | 0.05 |  |  |  |  |  |  |  | 0.05 |  |  | 0.05 |  |  |  | 0.05 |  |  |  |  |  |  |  |
Tonogold Resources, Inc. | Probability of Change in Control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input |  | 0.05 |  |  |  |  |  |  |  | 0.05 |  |  | 0.05 |  |  |  | 0.05 |  |  |  |  |  |  |  |
Tonogold Resources, Inc. | Probability of Default |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input |  | 0.27 |  |  |  |  |  |  |  | 0.27 |  |  | 0.27 |  |  |  | 0.27 |  |  |  |  |  |  |  |
Pelen LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing stock price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.47 |  |  |  |  |  |  |
Pelen LLC | Pelen LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Membership interest |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MCU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing stock price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 1.08 |  |  | $ 1.08 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based investment |  |  |  |  |  |  |  |  |  | $ 850,000 |  |  | $ 850,000 |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from common stock |  |  |  |  |  |  | $ 500,000 |  |  |  | $ 465,127 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mercury Clean Up LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Make-whole liability |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  |  | $ 452,740 |  |  |  |  |  |  |
Joint venture, common stock issued (in shares) | shares |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  | 625,000 |  |  |  |  |  |  |  |  |

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