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Stock Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 288,000 $ 245,000 $ 743,947 $ 781,645  
Stock options outstanding 2,625,690 2,719,100 2,625,690 2,719,100 2,823,400
Closing price of the common stock $ 5.96   $ 5.96    
Weighted average grant date fair value of share-based awards granted     $ 3.63 $ 2.21  
Total fair value of stock options vested     756,444 953,330  
Total unrecognized compensation cost $ 2,070,353   $ 2,070,353    
Unrecognized compensation cost, weighted average remaining requisite service period     2 years 10 months 13 days    
Number of unvested options 930,147   930,147    
2012 Plan
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for future grant 1,567,620   1,567,620    
Employee Stock Option | Minimum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Incentive options, vesting period     4 years    
Incentive options, vesting on the first anniversary of the date of grant     20.00%    
Employee Stock Option | Maximum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Incentive options, vesting period     5 years    
Incentive options, vesting on the first anniversary of the date of grant     25.00%    
Incentive options, term     10 years    
Non-Employee Directors and Consultants
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Incentive options, vesting period     1 year    
Unvested Options
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Incentive options, vesting period     5 years