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Stockholders' Equity - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 29, 2011
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Jun. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized   50,000,000   50,000,000   50,000,000  
Common stock, par value   $ 0.001   $ 0.001   $ 0.001  
Common stock, shares issued   11,580,608   11,580,608   11,562,209  
Common stock, shares outstanding   10,749,683   10,749,683   10,731,284  
Series A convertible preferred stock, shares authorized   114,000   114,000   114,000  
Series A convertible preferred stock, par value   $ 0.001   $ 0.001   $ 0.001  
Series A convertible preferred stock, shares issued   0   0   0  
Series A convertible preferred stock, shares outstanding   0   0   0  
Income tax benefit realized in connection with exercise of stock appreciation right       $ 102,000 $ 221,000    
Shares of common stock issuable upon exercise of the private placement warrant       750,002      
Common stock exercise price   $ 13.00   $ 13.00      
Estimated fair value $ 2,887,000            
Volatility factor 50.00%     55.00%      
Risk-free interest rate 2.10%            
Dividend yield 0.00%     0.00%      
Private placement warrants term       5 years      
Common stock valuation exercise price   $ 10.08   $ 10.08      
Shares registered for future issuance             500,000
SAR [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unexercised shares vested under Stock appreciation right   61,291   61,291      
Stock appreciation right shares subject to vest   181,290   181,290      
Number of shares exercised         120,000    
Number of shares granted to employees         181,291    
Shares issued withheld to satisfy income tax obligation, Value       $ 2,248,000      
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock issued   1,819 656 13,399 11,503    
Shares issued withheld to satisfy income tax obligation, Value   $ 27,000 $ 21,000 $ 316,000 $ 361,000    
Series A Preferred Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Series A convertible preferred stock, shares authorized   114,000   114,000      
Series A convertible preferred stock, par value   $ 0.001   $ 0.001      
Series A convertible preferred stock, shares issued   0   0   0  
Series A convertible preferred stock, shares outstanding   0   0   0  
Common Stock [Member] | SAR [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock issued       85,903      
Private Placement Warrants [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock exercise price   $ 13.00   $ 13.00      
Shares issued for warrants exercised   0 0 5,000 109,585    
Common stock reserved for the exercise of the Private Placement Warrants   282,257   282,257   287,257  
Private Placement [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock exercise price   $ 13.00   $ 13.00   $ 13.00  
Warrants expiry date       Apr. 29, 2016      
Volatility factor       55.00%   55.00%  
Dividend yield       0.00%   0.00%