Tonogold Resources Inc. ("Tonogold") Purchase, Lease, and Option Agreements - Narrative (Details)								1 Months Ended	3 Months Ended			9 Months Ended
	Sep. 08, 2020 USD ($) $ / shares	May 22, 2020 USD ($) day $ / shares	May 05, 2020	Mar. 20, 2020 USD ($) $ / shares	Dec. 23, 2019 USD ($)	Nov. 18, 2019 USD ($) $ / T	Sep. 16, 2019 USD ($)	Jan. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / shares numberOfAgreement	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / shares numberOfAgreement	Sep. 30, 2019 USD ($)	Sep. 29, 2020 $ / shares	Dec. 31, 2019 USD ($)	Dec. 30, 2019 USD ($)	Dec. 19, 2019 USD ($)	Oct. 14, 2019 USD ($)	Aug. 30, 2019 USD ($)	May 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Proceeds from deposits on Membership Interest Purchase Agreement (Note 20)												$ 1,140,000	$ 3,925,000
Issuance of convertible preferred stock									$ 0			$ 0			$ 0
Net smelter return percentage												3.00%
Proceeds from non refundable deposits	$ 140,000							$ 1,000,000.0
Interest rate	12.00%
Long-term debt									4,765,254			$ 4,765,254			5,412,074
Initial value of contingent forward				$ 1,200,000						$ 1,232,952
Contingent forward asset - fair value on settlement date	$ 2,000,000.0
Principal amount	4,475,000
Notes receivable at fair value	6,100,000								6,400,000			6,400,000
Change in fair value of contingent forward asset									(647,502)		$ 0	765,880	$ 0
Term of mineral lease			5 years
Quarterly rental fee							$ 10,000
Quarterly rental fee, increase in percentage							10.00%
Minimum payments under commitment					$ 20,000,000
Renewal term of mineral lease			15 years
Drill program cost	7,000,000
Advanced expense reimbursement												2,300,000
Deposits (Note 10)									498,122			498,122			318,384
Prepaid Tonogold expense reimbursements
Schedule of Equity Method Investments [Line Items]
Deposits (Note 10)									78,855			78,855			0
Reimbursement, Interest Expense
Schedule of Equity Method Investments [Line Items]
Advanced expense reimbursement												2,200,000
Exploration Expenditures, First Term
Schedule of Equity Method Investments [Line Items]
Minimum payments under commitment					5,000,000
Exploration Expenditures, Second Term
Schedule of Equity Method Investments [Line Items]
Minimum payments under commitment					10,000,000
Minimum payments under commitment, Annual					$ 1,000,000
Other Income
Schedule of Equity Method Investments [Line Items]
Change in fair value of contingent forward asset									$ 300,000			$ 300,000
Private Placement Conversion Price
Schedule of Equity Method Investments [Line Items]
Measurement input | $ / shares									0.18			0.18
Convertible Debt
Schedule of Equity Method Investments [Line Items]
Interest rate				12.00%
Long-term debt									$ 5,475,000			$ 5,475,000
Storey County, Nevada | Tonogold Agreement
Schedule of Equity Method Investments [Line Items]
Net smelter return percentage							3.00%
Term of mineral lease					20 years		10 years
Net smelter return royalty percentage, after year one							1.50%
Storey County, Nevada | Tonogold Agreement | Exploration Expenditures, First Term
Schedule of Equity Method Investments [Line Items]
Initial exploration term					5 years
Storey County, Nevada | Tonogold Agreement | Exploration Expenditures, Second Term
Schedule of Equity Method Investments [Line Items]
Renewal term of mineral lease					10 years
Storey County, Nevada | Tonogold Agreement | Exploration Expenditures, Third Term
Schedule of Equity Method Investments [Line Items]
Renewal term of mineral lease					5 years
American Flat Property | Lease 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						$ 1,000,000.0
Rental fee per ton processed | $ / T						1
Potential rental income under processing facility lease						$ 15,000,000
American Flat Property | Lease Option Agreement | Phase 2
Schedule of Equity Method Investments [Line Items]
Annual rental income under processing facility						$ 1,000,000.0
Rental fee per ton processed | $ / T						0.50
Potential rental income under processing facility lease						$ 10,000,000
Lucerne Mine (Mineral rights and properties) (Note 20) | Tonogold Agreement
Schedule of Equity Method Investments [Line Items]
Net smelter return percentage						1.50%
Tonogold Resources, Inc.
Schedule of Equity Method Investments [Line Items]
Number of counterparty agreements | numberOfAgreement									3			3
Proceeds from deposits on Membership Interest Purchase Agreement (Note 20)	7,065,000
Issuance of convertible preferred stock		$ 7,600,000				$ 7,600,000			$ 2,600,000			$ 2,600,000			6,100,000	$ 100,000	$ 500,000	$ 750,000	$ 830,000	$ 3,920,000
Consideration received	18,814,928
Net gain on sale	18,275,846
Threshold percentage of stock price trigger		85.00%
Threshold consecutive trading days | day		20
Closing stock price (in dollars per share) | $ / shares		$ 0.18							$ 0.39			$ 0.39		$ 0.18
Weighted average conversion price (in dollars per share)		120.00%
Contingent forward asset - fair value on settlement date	1,998,832
Notes receivable at fair value	$ 6,141,497
Change in fair value of contingent forward asset												$ 300,000
Tonogold Resources, Inc. | Common Share Price
Schedule of Equity Method Investments [Line Items]
Measurement input | $ / shares	0.35			0.35					0.39			0.39
Tonogold Resources, Inc. | Volatility
Schedule of Equity Method Investments [Line Items]
Measurement input	0.96			0.960					0.96			0.96
Tonogold Resources, Inc. | Risk-Free Rate
Schedule of Equity Method Investments [Line Items]
Measurement input	0.0015			0.0015					0.0015			0.0015
Tonogold Resources, Inc. | Private Placement Conversion Price
Schedule of Equity Method Investments [Line Items]
Measurement input | $ / shares	0.30			0.300					0.30			0.30
Tonogold Resources, Inc. | Probability of Prepayment
Schedule of Equity Method Investments [Line Items]
Measurement input | $ / shares	0.05			0.05					0.05			0.05
Tonogold Resources, Inc. | Probability of Change in Control
Schedule of Equity Method Investments [Line Items]
Measurement input	0.05			0.05					0.05			0.05
Tonogold Resources, Inc. | Cost of Debt
Schedule of Equity Method Investments [Line Items]
Measurement input	0.1112			0.1112					0.1112			0.1112
Tonogold Resources, Inc. | Probability of Default
Schedule of Equity Method Investments [Line Items]
Measurement input	0.27			0.27					0.27			0.27
Tonogold Resources, Inc. | Convertible Debt
Schedule of Equity Method Investments [Line Items]
Interest rate	12.00%
Long-term debt	$ 4,475,000
Principal amount				$ 5,475,000
Tonogold Resources, Inc.
Schedule of Equity Method Investments [Line Items]
Proceeds from deposits on Membership Interest Purchase Agreement (Note 20)						$ 6,000,000.0
Issuance of convertible preferred stock									$ 6,100,000			$ 6,100,000			$ 6,100,000
Tonogold Resources, Inc. | Convertible Debt
Schedule of Equity Method Investments [Line Items]
Principal amount	$ 4,475,000			$ 5,475,000
Comstock Mining LLC
Schedule of Equity Method Investments [Line Items]
Long-term debt									$ 4,700,000			$ 4,700,000
Comstock Mining LLC | Tonogold Resources, Inc.
Schedule of Equity Method Investments [Line Items]
Membership interest	100.00%			50.00%		50.00%