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Related Party Transactions - Additional Information (Detail) - USD ($)
 12 Months Ended
Mar. 22, 2017
Dec. 29, 2015
May 12, 2015
Oct. 17, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 18, 2014
Related Party Transaction [Line Items]              
Future minimum lease payments         $ 200,000    
Trade receivables         145,000 $ 132,000  
Outstanding borrowings         14,893,000 15,866,000  
Gains on extinguishment of Series B preferred stock and issuance of Series C preferred stock $ 1,011            
Comstock Asset Management, L.C. [Member]              
Related Party Transaction [Line Items]              
Total rental payments made under lease agreement         200,000 300,000  
Rent expense         $ 200,000 $ 300,000  
Comstock Development Services [Member]              
Related Party Transaction [Line Items]              
Credit facility outstanding       $ 10,000,000      
Other Purchasers [Member]              
Related Party Transaction [Line Items]              
Credit facility outstanding       6,200,000      
Stonehenge [Member]              
Related Party Transaction [Line Items]              
Original principal amount   $ 4,500,000          
Principal amount outstanding plus all accrued but unpaid interest   $ 3,900,000          
Series B Preferred Stock [Member]              
Related Party Transaction [Line Items]              
Preferred stock par value         $ 0.01 $ 0.01  
Paid-in-kind dividends on preferred stock, number of shares         15,663 69,639  
Paid-in-kind dividends on preferred stock, liquidation value         $ 78,000 $ 348,000  
Shares exchanged pursuant to agreement, converted 858,210            
Series B Preferred Stock [Member] | Stonehenge [Member]              
Related Party Transaction [Line Items]              
Shares issued upon conversion of debt   772,210          
Preferred stock par value   $ 0.01          
Preferred stock redemption price   $ 5.00          
Preferred stock dividend rate, percentage   8.75%          
Series C Preferred Stock [Member]              
Related Party Transaction [Line Items]              
Preferred stock par value         $ 0.01 $ 0.01  
Shares exchanged pursuant to agreement, issued 772,210            
Par value per share $ 0.01            
Stated value per share $ 5.00            
Class A [Member] | Comstock Growth Fund [Member] | Private Placement [Member]              
Related Party Transaction [Line Items]              
Number of shares issued     226,857        
Trade Receivables [Member] | Comstock Asset Management, L.C. [Member]              
Related Party Transaction [Line Items]              
Trade receivables         $ 145,000 $ 132,000  
Services and out of Pocket Expenses Incurred [Member] | Revenue Other [Member] | Comstock Asset Management, L.C. [Member]              
Related Party Transaction [Line Items]              
Services and out-of-pocket expenses incurred         1,100,000 900,000  
Notes Payable, Other Payables [Member] | Comstock Growth Fund [Member]              
Related Party Transaction [Line Items]              
Debt instrument, initial principal amount       10,000,000      
Maximum borrowing amount       $ 20,000,000     $ 25,000,000
Additional aggregate principal loan amount         6,200,000    
Credit facility outstanding         $ 16,200,000    
Debt instrument, term       3 years      
Debt instrument, interest rate description         LIBOR    
Loan annual principal repayment, percentage       10.00%      
Notes Payable, Other Payables [Member] | Comstock Growth Fund II, L.C. [Member]              
Related Party Transaction [Line Items]              
Credit facility outstanding   $ 5,000,000          
Maximum borrowing amount   $ 10,000,000          
Debt instrument, term   2 years          
Debt instrument, floor interest rate   10.00%          
Line of credit facility additional extension period   1 year          
Debt instrument, interest payment terms         Interest payments will be accrued and paid in kind monthly for the first year, and then paid current monthly in arrears beginning December 31, 2016    
Outstanding borrowings         $ 3,600,000 3,300,000  
Comstock Growth Fund II, L.C. [Member] | Comstock Growth Fund II, L.C. [Member]              
Related Party Transaction [Line Items]              
Debt instrument, initial principal amount   $ 5,000,000          
Maximum borrowing amount   $ 10,000,000          
Debt instrument, term   2 years          
Debt instrument, floor interest rate   10.00%          
Line of credit facility additional extension period   1 year          
Line of credit facility extension fees   $ 10,000,000          
Debt instrument, interest payment terms         Interest payments will be accrued and paid in kind monthly for the first year, and then paid current monthly in arrears beginning December 31, 2016.    
Outstanding borrowings         $ 3,600,000 $ 3,300,000  
LIBOR Rate [Member] | Notes Payable, Other Payables [Member] | Comstock Growth Fund [Member]              
Related Party Transaction [Line Items]              
Debt instrument, spread variable rate       9.75%      
Floor Rate [Member] | Notes Payable, Other Payables [Member] | Minimum [Member] | Comstock Growth Fund [Member]              
Related Party Transaction [Line Items]              
Debt instrument, floor interest rate       10.00%