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Fair Value Measurements - Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total income (losses) recognized in earnings $ (2,421,117) $ 1,472,737
Additions 7,374,449 7,607,263
Deductions: (4,614,832) 0
Tonogold convertible preferred shares    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 9,080,000 0
Total income (losses) recognized in earnings (2,544,000) 1,472,737
Additions 0 7,607,263
Transfers (3,920,000) 0
Redemption of Tonogold convertible preferred shares (2,616,000) 0
Ending balance 5,498,500 9,080,000
Tonogold contingent forward asset    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total income (losses) recognized in earnings 765,880 0
Additions 1,232,952 0
Settlement of Tonogold contingent forward asset (1,998,832) 0
Tonogold note receivable    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total income (losses) recognized in earnings (642,997) 0
Additions $ 6,141,497 $ 0