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Stockholders Equity - Additional Information (Detail) (USD $)
 0 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Aug. 15, 2013
SAR [Member]
Jun. 30, 2014
SAR [Member]
Jun. 30, 2014
Restricted Stock [Member]
Jul. 16, 2013
Underwritten Public Offering [Member]
Jun. 30, 2014
Private Placement Warrants [Member]
Jun. 30, 2013
Private Placement Warrants [Member]
Jun. 30, 2014
Private Placement Warrants [Member]
Jun. 30, 2013
Private Placement Warrants [Member]
Dec. 31, 2013
Private Placement Warrants [Member]
Jun. 30, 2014
Private Placement [Member]
Dec. 31, 2013
Private Placement [Member]
Feb. 14, 2014
Shelf Registration [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                        
Series A convertible preferred stock, shares outstanding 0 0                        
Common stock exercise price $ 0.001 $ 0.001         $ 13.00   $ 13.00          
Common stock, shares authorized 50,000,000 50,000,000                        
Common stock, shares issued 11,559,147 11,352,812                        
Common stock, shares outstanding 10,728,222 10,521,887                        
Public offering shares           2,005,000                
Underwritten public offering Price per share           $ 35.00           $ 71.97 $ 75.10  
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                
Grantee exercised Stock appreciation right     181,291 120,000                    
Common stock new issued to meet Stock appreciation right exercise     96,504 85,903 10,847                  
Income tax benefit realized in connection with exercise of stock appreciation right       2,248,000 214,000                  
Shares vested and unexercised       61,291                    
Shares issued withheld to satisfy income tax obligation, Value         340,000                  
Shares of common stock issuable upon exercise of the private placement warrant                 750,002          
Warrants expiry date                       Apr. 29, 2016    
Shares issued for warrants exercised             69,333 70,833 109,585 209,167        
Common stock reserved for the exercise of the Private Placement Warrants             287,257   287,257   396,842      
Aggregate offering value                           $ 150,000,000