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Stock Based Compensation - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Mar. 31, 2012
Non Executive Director 1
Jun. 30, 2012
Non Executive Director 1
Jun. 30, 2012
Non Executive Director 1
May 31, 2012
Non Executive Director 2
Jun. 30, 2012
Non Executive Director 2
Jun. 30, 2012
Non Executive Director 2
Jul. 31, 2012
Non Executive Director 3
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Aggregate number of common stock shares available for grant 4,341,989                  
Stock option granted, shares 25,000     12,500     12,500     12,500
Stock option granted, exercise price per share       $ 2.77     $ 2.06     $ 1.22
Fair value of options granted       $ 15,300     $ 11,000     $ 7,000
Stock option fair value assumptions, assumed volatility rate       95.89%     95.21%     94.92%
Stock option fair value assumptions, expiration term       3 years     3 years     3 years
Stock option fair value assumptions, expected tenor       1 year 5 months 27 days     1 year 5 months 27 days     1 year 5 months 27 days
Stock option fair value assumptions, risk-free rate       0.21%     0.21%     0.24%
Stock option expense 26,300 3,169,000     0 15,300   11,000 11,000  
Weighted average grant date fair value $ 7.18   $ 7.29              
Aggregate intrinsic value of the stock options and warrants $ 1,382,612