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Preferred Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 23, 2018
Mar. 22, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 29, 2015
Class of Stock [Line Items]          
Gains on extinguishment of Series B preferred stock and issuance of Series C preferred stock   $ 1,011      
Credit facility outstanding         $ 5,000
Income tax expense (benefit)     $ (920) $ 38  
Note Exchange Agreement [Member] | Comstock Growth Fund II, L.C. [Member]          
Class of Stock [Line Items]          
Gain loss on conversion of notes $ 3,700   3,700    
Income tax expense (benefit) (500)   $ (900)    
Notes Payable, Other Payables [Member] | Comstock Growth Fund II, L.C. [Member]          
Class of Stock [Line Items]          
Credit facility outstanding         $ 5,000
Notes Payable, Other Payables [Member] | Note Exchange Agreement [Member] | Comstock Growth Fund II, L.C. [Member]          
Class of Stock [Line Items]          
Credit facility outstanding $ 3,700     $ 3,600  
Series B Preferred Stock [Member]          
Class of Stock [Line Items]          
Paid-in-kind dividends on preferred stock, number of shares       15,663  
Paid-in-kind dividends on preferred stock, liquidation value       $ 78  
Shares exchanged pursuant to agreement, converted   858,210      
Series C Preferred Stock [Member]          
Class of Stock [Line Items]          
Paid-in-kind dividends on preferred stock, number of shares       0  
Shares exchanged pursuant to agreement, issued   772,210      
Par value per share   $ 0.01      
Stated value per share   $ 5.00      
Preferred Stock, par value     $ 0.01 $ 0.01  
Series C- Non Convertible Preferred Stock [Member] | Notes Payable, Other Payables [Member] | Note Exchange Agreement [Member] | Comstock Growth Fund II, L.C. [Member]          
Class of Stock [Line Items]          
Convertible preferred shares issued upon conversion 738,390        
Preferred Stock, par value $ 0.01        
Preferred stock liquidation value per share $ 5.00