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Debt - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 19, 2020
May 23, 2018
Oct. 17, 2014
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Mar. 27, 2020
Dec. 18, 2014
Line of Credit Facility [Line Items]                
Unsecured financing       $ 96,000   $ 5,000    
Total notes payable       $ 5,596,000   $ 5,505,000    
Redeemable Series C Preferred Stock                
Line of Credit Facility [Line Items]                
Preferred stock, par value (in dollars per share)       $ 0.01   $ 0.01    
CDS | Revolving Capital Line of Credit Agreement | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Debt instrument term (in years) 5 years              
Maximum borrowing capacity $ 10,000,000.0              
Debt instrument maturity date from initial date 12 months              
Capital line of credit borrowed             $ 5,500,000  
Principal payments to CGF       $ 0        
Comstock Growth Fund                
Line of Credit Facility [Line Items]                
Interest payments       $ 58,000 $ 143,000      
WSJ Prime Rate | Revolving Capital Line of Credit Agreement | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Debt instrument spread variable rate 1.00%              
Unsecured Debt                
Line of Credit Facility [Line Items]                
Debt instrument term (in years)       1 year        
Unsecured financing       $ 96,000   $ 5,000    
Interest rate for period       2.40%   3.30%    
Unsecured Promissory Note | Comstock Growth Fund                
Line of Credit Facility [Line Items]                
Debt instrument term (in years)     3 years          
Maximum borrowing capacity     $ 20,000,000.0         $ 25,000,000
Total notes payable     $ 10,000,000.0          
Unsecured Promissory Note | Comstock Growth Fund | Membership Exchange Agreement                
Line of Credit Facility [Line Items]                
Credit facility outstanding   $ 7,700,000            
Percentage of membership interest   91.50%            
Debt instrument reduction   $ 5,700,000            
Repayments of debt         $ 5,700,000      
Unsecured Promissory Note | Comstock Growth Fund | Membership Exchange Agreement | Series C Non-Convertible Preferred Stock                
Line of Credit Facility [Line Items]                
Convertible preferred shares issued upon conversion (in shares)   1,482,300            
Preferred stock, par value (in dollars per share)   $ 0.01            
Unsecured Promissory Note | Comstock Growth Fund | Membership Exchange Agreement | Redeemable Series C Preferred Stock                
Line of Credit Facility [Line Items]                
Preferred stock liquidation value (in dollars per share)   $ 5.00