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Preferred Stock - Additional Information (Detail) - USD ($)
 12 Months Ended
Mar. 22, 2017
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]      
Gains on extinguishment of Series B preferred stock and issuance of Series C preferred stock $ 1,011    
Series B Preferred Stock [Member]      
Class of Stock [Line Items]      
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 C Preferred Stock [Member]      
Class of Stock [Line Items]      
Shares exchanged pursuant to agreement, issued 772,210    
Par value per share $ 0.01    
Stated value per share $ 5.00