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Debt, Net - Narrative (Details) - USD ($)
 4 Months Ended 12 Months Ended
Oct. 31, 2020
May 29, 2020
May 28, 2020
Dec. 31, 2020
Dec. 31, 2019
Oct. 04, 2019
Debt Instrument [Line Items]            
Percentage of stock issued to creditors   1.00%        
Unamortized discount       $ 14,674,000    
Shares issued       1,000    
Proceeds from sales of equipment $ 2,300,000     2,315,000 $ 0  
Restricted cash - Note 6       $ 0 $ 3,270,000  
Common Stock            
Debt Instrument [Line Items]            
Number of shares issued [1]       101 37,600  
Additional Paid-in Capital            
Debt Instrument [Line Items]            
Shares issued [1]       $ 1,000    
Sprott Credit Agreement            
Debt Instrument [Line Items]            
Share price (in dollars per share)   $ 12.65        
Shares issued       $ 6,282,000    
Sprott Credit Agreement | Common Stock            
Debt Instrument [Line Items]            
Number of shares issued   496,634   496,634 [1]    
Sprott Credit Agreement | Additional Paid-in Capital            
Debt Instrument [Line Items]            
Shares issued   $ 6,300,000   $ 6,282,000 [1]    
Subordinated debt            
Debt Instrument [Line Items]            
Stated interest rate   10.00%        
1.25 Lien Notes for Subordinated Notes            
Debt Instrument [Line Items]            
Debt converted   $ 80,000,000.0   80,000,000 $ 0  
2.0 Lien Notes to common stock            
Debt Instrument [Line Items]            
Debt converted   221,300,000        
Retained earnings, increase (decrease) upon debt conversion   $ 74,600,000        
Debt conversion, number of shares distributed   14,795,153        
Conversion price (in dollars per share)   $ 1.67        
Debt conversion, number of shares issued   132,800,000        
1.5 Lien Notes to common stock            
Debt Instrument [Line Items]            
Debt converted   $ 145,700,000   160,254,000 0  
Retained earnings, increase (decrease) upon debt conversion   $ (14,600,000)        
Debt conversion, number of shares issued   16,025,316        
Percentage of total principal amount   10.00%        
1.25 Lien Notes to common stock            
Debt Instrument [Line Items]            
Debt converted   $ 48,500,000   48,459,000 0  
Debt conversion, number of shares issued   4,850,000        
1.25 Lien Notes to Subordinated Notes            
Debt Instrument [Line Items]            
Debt converted   $ 80,000,000.0        
Debt conversion, amount   80,000,000.0        
Sprott Credit Agreement            
Debt Instrument [Line Items]            
Minimum working capital       10,000,000.0    
Minimum unrestricted cash       $ 10,000,000.0    
Gold and silver, discount rate       5.00%    
Maximum borrowing capacity           $ 110,000,000.0
Stated amount of borrowing   $ 70,000,000.0        
Debt, original issue discount   2.00%        
Original issue discount   $ 1,400,000        
Remaining borrowing capacity       $ 40,000,000.0    
Proceeds from issuance of debt   62,300,000   $ 68,600,000 0  
Interest obligation   9,300,000        
Unamortized discount   $ 17,000,000.0        
Stated interest rate   7.00%   8.50%    
Periodic payment, first twelve months   $ 0        
Percentage of interest capitalized   100.00%        
Quarterly interest payable   $ 500,000        
First four principal repayments, percentage of outstanding principal   2.50%        
Subsequent principal repayments, percentage of outstanding principal   7.50%        
Debt term   5 years        
Amount of debt repurchased $ 1,200,000          
Sprott Credit Agreement | Minimum            
Debt Instrument [Line Items]            
Early repayment premium   3.00%        
Payment terms, percent of proceeds received       50.00%    
Sprott Credit Agreement | Maximum            
Debt Instrument [Line Items]            
Early repayment premium   5.00%        
Payment terms, percent of proceeds received       100.00%    
Sprott Credit Agreement | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.50%        
2.0 Lien Notes            
Debt Instrument [Line Items]            
Stated interest rate   15.00%        
1.5 Lien Notes            
Debt Instrument [Line Items]            
Stated interest rate   15.00%        
Repurchase price percentage   110.00%        
1.25 Lien Notes            
Debt Instrument [Line Items]            
Proceeds from issuance of debt       $ 44,841,000 71,831,000  
Stated interest rate   15.00%        
1.25 Lien Notes | 1.25 Lien Notes to common stock            
Debt Instrument [Line Items]            
Debt converted   $ 48,500,000        
Debt conversion, number of shares issued   4,845,920        
1.25 Lien Notes | 1.25 Lien Notes to Subordinated Notes            
Debt Instrument [Line Items]            
Debt converted   $ 80,000,000.0        
Debt conversion, amount   80,000,000.0        
Subordinated Notes            
Debt Instrument [Line Items]            
Stated amount of borrowing   $ 80,000,000.0        
Subordinated Notes | Subordinated debt            
Debt Instrument [Line Items]            
Stated interest rate   10.00%        
First Lien Agreement            
Debt Instrument [Line Items]            
Repayment of debt   $ 125,500,000   125,468,000 0  
Restricted cash - Note 6   3,300,000        
First Lien Agreement | Alternative Base Rate Canada            
Debt Instrument [Line Items]            
Basis spread on variable rate     7.50%      
Promissory Note            
Debt Instrument [Line Items]            
Repayment of debt   $ 6,900,000   $ 6,914,000 $ 0  
[1] Retroactively restated for the reverse recapitalization as described in Note 2 - Summary of Significant Accounting Policies.