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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Segment
Jun. 30, 2011
Dec. 31, 2011
Significant Accounting Policies [Line Items]          
Number of operating segment     1    
Deferred revenue $ 19,000   $ 19,000   $ 500,000
Cost reimbursed to offset research and development expenses 400,000 100,000 1,000,000 400,000  
Share-based compensation forfeitures rate 12.00% 12.00%      
Stock options granted 185,000 208,000 200,948 304,000  
Restricted stock granted 0 0 0 0  
Unrecognized share-based compensation expense related to unvested awards 2,900,000   2,900,000    
Income tax expense $ 16,133   $ 166,538    
Anti-dilutive securities excluded from computation of earnings per share 11,600,000     10,900,000  
Maximum
         
Significant Accounting Policies [Line Items]          
Unrecognized share-based compensation expense related to unvested awards expected to be recognized in the period 2 years 1 month 6 days        
Liquidity | Maximum
         
Significant Accounting Policies [Line Items]          
Cash liquidity maturity period     3 months