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Redeemable Convertible Preferred Stock - Additional Information (Detail)
 12 Months Ended
May 02, 2012
USD ($)
Dec. 31, 2017
USD ($)
Installment
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Aug. 01, 2017
$ / shares
shares
Apr. 30, 2012
shares
Apr. 13, 2012
$ / shares
shares
Temporary Equity [Line Items]            
Redeemable convertible preferred stock, shares issued   1,000,000 1,000,000      
Common stock, shares issued   8,850,532 8,499,508     1,000,000
Warrants to purchase common stock   325,000        
Redeemable convertible preferred stock, shares authorized   1,000,000 1,000,000      
Preferred stock and warrants value issued | $ $ 5,000,000          
Warrants value | $   $ 840,000        
Accretion amount | $   $ 60,000 $ 50,000      
Maximum | Repricing Agreement            
Temporary Equity [Line Items]            
Limitations for issuance of common stock or voting power outstanding to holder, in percentage       19.99%    
Warrants Exercise Price Tranche One            
Temporary Equity [Line Items]            
Warrant exercise price per share | $ / shares           $ 6.00
Warrants to purchase common stock           125,000
Warrants Exercise Price Tranche Two            
Temporary Equity [Line Items]            
Warrant exercise price per share | $ / shares           $ 7.00
Warrants to purchase common stock           200,000
Securities Purchase Agreement            
Temporary Equity [Line Items]            
Number of warrants           325,000
Series A Convertible Preferred Stock            
Temporary Equity [Line Items]            
Conversion price per share | $ / shares           $ 5.00
Redeemable convertible preferred stock, shares authorized         1,000,000  
Cumulative dividends at a rate   6.00%        
Preferred stock value | $ $ 4,160,000          
Series A Convertible Preferred Stock | Common Stock | Repricing Agreement            
Temporary Equity [Line Items]            
Conversion price per share | $ / shares       $ 2.26    
Convertible preferred stock, shares issuable upon conversion   2,212,389        
Series A Convertible Preferred Stock | Accounts Payable and Other Accrued Expenses            
Temporary Equity [Line Items]            
Total accrued but unpaid dividends | $   $ 80,000 $ 230,000      
Series A Convertible Preferred Stock | Scenario, Plan            
Temporary Equity [Line Items]            
Redeemable convertible preferred stock, liquidation preference per share | $ / shares   $ 5.00        
Number of redemption price, accrued and unpaid dividends installment payments | Installment   36        
Annual interest rate on redemption value payable   6.00%        
Redemption price per share | $ / shares   $ 5.00 $ 5.00      
Series A Convertible Preferred Stock | Scenario, Plan | Maximum            
Temporary Equity [Line Items]            
Majority outstanding shares redeemable date   Apr. 30, 2017        
Series A Convertible Preferred Stock | Securities Purchase Agreement            
Temporary Equity [Line Items]            
Redeemable convertible preferred stock, shares issued           1,000,000
Warrant exercise price per share | $ / shares           $ 5.00
Series A Warrants | Common Stock | Repricing Agreement            
Temporary Equity [Line Items]            
Warrant exercise price per share | $ / shares       $ 2.72    
Warrants to purchase common stock       125,000    
Series B Warrants | Common Stock | Repricing Agreement            
Temporary Equity [Line Items]            
Warrant exercise price per share | $ / shares       $ 3.17    
Warrants to purchase common stock       200,000