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Stockholders' Equity - Additional Information (Detail) - USD ($)
 12 Months Ended
Aug. 15, 2013
Jul. 16, 2013
Oct. 31, 2011
Apr. 29, 2011
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 10, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock, shares authorized         50,000,000 50,000,000    
Common stock, par value         $ 0.001 $ 0.001    
Common stock, shares issued         11,583,831 11,562,209    
Common stock, shares outstanding         10,752,906 10,731,284    
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    
Series A convertible preferred stock, shares outstanding         0 0    
Shares issued withheld to satisfy income tax obligation, Value         $ 351,000 $ 430,000 $ 2,063,000  
Income tax benefit realized in connection with exercise of stock appreciation right         $ 65,000 $ 2,704,000 1,642,000  
Shares of common stock issuable upon exercise of the private placement warrant         750,002      
Common stock exercise price         $ 13.00      
Estimated fair value       $ 2,887,000        
Volatility factor       50.00%        
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      
Common stock repurchased by the company, shares         830,925 830,925    
Common stock repurchased by the company, value         $ 4,250,000 $ 4,250,000    
Proceeds to the company from public offering             $ 36,750,000  
Proceeds from sale of shares         $ 0      
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    
Grantee exercised Stock appreciation right 181,291         120,000    
Number of shares granted to employees           181,291    
Common stock issued 96,504              
Shares issued withheld to satisfy income tax obligation, Value $ 2,063,000         $ 2,427,000    
Shares issued withheld to satisfy income tax obligation 42,314              
Income tax benefit realized in connection with exercise of stock appreciation right $ 1,642,000              
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock issued         16,622 13,909    
Shares issued withheld to satisfy income tax obligation, Value         $ 351,000 $ 430,000    
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      
Series A convertible preferred stock, par value         $ 0.001      
Series A convertible preferred stock, shares issued         0 0    
Series A convertible preferred stock, shares outstanding         0 0    
Stock Purchase Agreement [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock repurchased by the company, shares     830,925          
Common stock repurchased by the company, value     $ 4,250,000          
Common stock repurchased by the company, per share value     $ 5.11          
Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total Shares registered for future issuance               150,000,000
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      
Shares issued for warrants exercised         5,000 109,585 339,410  
Common stock reserved for the exercise of the Private Placement Warrants         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    
Warrants expiry date         Apr. 29, 2016      
Volatility factor         55.00% 55.00%    
Dividend yield         0.00% 0.00%    
Underwritten public offering price per share         $ 18.25 $ 51.61    
Underwritten Public Offering [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Public offering shares   2,005,000            
Underwritten public offering price per share   $ 35.00            
Shares sold through public offering   1,050,000            
Share sold by stockholders through public offering   955,000            
Proceeds to the company from public offering   $ 34,530,000            
Public offering expense   $ 514,000