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DEBT - Additional Information (Detail)
 12 Months Ended
Mar. 19, 2020
USD ($)
Dec. 31, 2019
USD ($)
note
$ / shares
May 23, 2018
USD ($)
$ / shares
shares
Oct. 17, 2014
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
loan
$ / shares
Mar. 27, 2020
USD ($)
Dec. 18, 2014
USD ($)
Line of Credit Facility [Line Items]                
Outstanding borrowings and accrued interest, net of discounts   $ 5,706,000     $ 5,500,000 $ 5,706,000    
Debt instrument, gross         $ 5,505,000      
Series C Preferred Stock                
Line of Credit Facility [Line Items]                
Preferred stock par value (in dollars per share) | $ / shares   $ 0.01     $ 0.01 $ 0.01    
CDS | Revolving Capital Line of Credit Agreement | Secured Financing                
Line of Credit Facility [Line Items]                
Maximum borrowing capacity $ 10,000,000.0              
Debt instrument, term 5 years              
Debt instrument maturity date from initial date 12 months              
Capital line of credit drawn             $ 5,500,000  
Comstock Growth Fund                
Line of Credit Facility [Line Items]                
Interest payments         $ 400,000 $ 600,000    
Unsecured Seller-financed Promissory Note                
Line of Credit Facility [Line Items]                
Debt instrument, term         1 year      
Number of unsecured seller-financed promissory note outstanding | note   1            
Debt instrument, gross   $ 595,000     $ 5,000 595,000    
Debt instrument, amount due on third anniversary   50,000       50,000    
Debt instrument, amount due on fourth anniversary   $ 50,000       $ 50,000    
Interest rate for period           5.00%    
WSJ Prime Rate | Revolving Capital Line of Credit Agreement                
Line of Credit Facility [Line Items]                
Debt instrument spread variable rate 1.00%              
LIBOR Rate | Unsecured Seller-financed Promissory Note                
Line of Credit Facility [Line Items]                
Debt instrument spread variable rate           3.00%    
Secured Financing                
Line of Credit Facility [Line Items]                
Fixed interest rate   6.50%       6.50%    
Number of secured loans | loan           2    
Secured Loan One                
Line of Credit Facility [Line Items]                
Outstanding secured debt   $ 700,000       $ 700,000    
Secured Loan Two                
Line of Credit Facility [Line Items]                
Outstanding secured debt   27,000       27,000    
Unsecured Notes Payable To Affiliate | Comstock Growth Fund                
Line of Credit Facility [Line Items]                
Outstanding borrowings and accrued interest, net of discounts   $ 5,700,000       5,700,000    
Unsecured Notes Payable To Affiliate | Comstock Growth Fund | Membership Exchange Agreement                
Line of Credit Facility [Line Items]                
Retirement of debt         $ 5,700,000      
Notes Payable, Other Payables | Comstock Growth Fund                
Line of Credit Facility [Line Items]                
Maximum borrowing capacity       $ 20,000,000.0       $ 25,000,000
Debt instrument, term       3 years        
Debt instrument, initial principal amount       $ 10,000,000.0        
Fixed interest rate     10.00%          
Principal payments to CGF           $ 0    
Notes Payable, Other Payables | 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          
Notes Payable, Other Payables | 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) | shares     1,482,300          
Preferred stock par value (in dollars per share) | $ / shares     $ 0.01          
Notes Payable, Other Payables | Comstock Growth Fund | Membership Exchange Agreement | Series C Preferred Stock                
Line of Credit Facility [Line Items]                
Preferred stock liquidation value (in dollars per share) | $ / shares     $ 5.00