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Tonogold Resources Inc. ("Tonogold") Securities (Details)
3 Months Ended 9 Months Ended 14 Months Ended
Oct. 02, 2020
USD ($)
Sep. 29, 2020
USD ($)
$ / shares
shares
Sep. 08, 2020
USD ($)
$ / shares
Jul. 22, 2020
USD ($)
shares
May 22, 2020
USD ($)
day
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
shares
May 15, 2020
USD ($)
Mar. 20, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
shares
Dec. 30, 2019
USD ($)
Dec. 19, 2019
USD ($)
Nov. 18, 2019
USD ($)
Oct. 14, 2019
USD ($)
Aug. 30, 2019
USD ($)
May 31, 2019
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Issuance of convertible preferred stock           $ 0   $ 0         $ 0            
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                  
Sale of stock, price per share (in dollars per share) | $ / shares           $ 0.40   $ 0.40                      
Proceeds from the issuance of common stock       $ 1,250,000   $ 1,400,000   $ 4,197,622 $ 3,835,867 $ 1,700,000                  
Common stock, shares outstanding (in shares) | shares           34,440,766   34,440,766         27,236,489            
Issuance of common stock           $ 22,937   $ 22,937     $ 314,687   $ 18,139            
Principal amount     $ 4,475,000                                
Long-term debt           4,765,254   4,765,254         5,412,074            
Interest rate     12.00%                                
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                    
Private Placement Conversion Price                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Measurement input | $ / shares           0.18   0.18                      
Convertible Debt                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Long-term debt           $ 5,475,000   $ 5,475,000                      
Interest rate                       12.00%              
Subsequent Event                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Weighted average conversion price (in dollars per share) 120.00%                                    
Preferred stock redemption price $ 2,600,000                                    
Tonogold Resources, Inc.                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
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
Threshold percentage of stock price trigger         85.00%                            
Threshold consecutive trading days | day         20                            
Closing stock price (in dollars per share) | $ / shares   $ 0.18     $ 0.18 $ 0.39   $ 0.39                      
Weighted average conversion price (in dollars per share)         120.00%                            
Investments in Tonogold shares (Note 3)     7,607,263     $ 9,722,022   $ 9,722,022         $ 0            
Convertible preferred stock exchanged, amount   $ 2,800,000     $ 1,100,000                            
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                      
Proceeds from the issuance of common stock               $ 1,400,000                      
Preferred stock, shares outstanding (in shares) | shares           2,200,000   2,200,000                      
Common stock, shares outstanding (in shares) | shares           18,220,569   18,220,569                      
Issuance of common stock           $ 7,100,000   $ 7,100,000                      
Notes receivable at fair value     $ 6,141,497                                
Change in fair value of contingent forward asset               $ 300,000                      
Tonogold Resources, Inc. | Common Share Price                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Measurement input | $ / shares     0.35     0.39   0.39       0.35              
Tonogold Resources, Inc. | Volatility                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Measurement input     0.96     0.96   0.96       0.960              
Tonogold Resources, Inc. | Risk-Free Rate                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Measurement input     0.0015     0.0015   0.0015       0.0015              
Tonogold Resources, Inc. | Cost of Debt                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Measurement input     0.1112     0.1112   0.1112       0.1112              
Tonogold Resources, Inc. | Private Placement Conversion Price                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Measurement input | $ / shares     0.30     0.30   0.30       0.300              
Tonogold Resources, Inc. | Probability of Prepayment                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Measurement input | $ / shares     0.05     0.05   0.05       0.05              
Tonogold Resources, Inc. | Probability of Change in Control                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Measurement input     0.05     0.05   0.05       0.05              
Tonogold Resources, Inc. | Probability of Default                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Measurement input     0.27     0.27   0.27       0.27              
Tonogold Resources, Inc. | Convertible Debt                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Principal amount                       $ 5,475,000              
Long-term debt     $ 4,475,000                                
Interest rate     12.00%                                
Tonogold Resources, Inc. | Convertible Debt | Change Of Control, Redemption Right                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Redemption price percentage     125.00%                                
Tonogold Resources, Inc. | Convertible Debt | Default Redemption Right                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Redemption price percentage     118.00%                                
Tonogold Resources, Inc. | Subsequent Event                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Issuance of convertible preferred stock $ 2,200,000                                    
Tonogold Resources, Inc. | Convertible Preferred Stock                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Investments in Tonogold shares (Note 3)         $ 7,600,000