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Computation of Basic and Diluted Net (Loss) Earnings Per Common Share (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share [Line Items]        
Net (loss) income $ (2,268,914) $ 1,962,495 $ (3,521,003) $ 2,984,422
Unvested restricted stock            
Unsecured convertible note   28,323   56,372
DILUTED (LOSS) EARNINGS PER SHARE $ (2,268,914) $ 1,990,818 $ (3,521,003) $ 3,040,794
Shares        
Net (loss) income 14,147,049 13,456,310 14,124,380 13,427,997
Unvested restricted stock   1,065,658   1,022,504
Unsecured convertible note   377,640   377,640
DILUTED (LOSS) EARNINGS PER SHARE 14,147,049 14,899,608 14,124,380 14,828,141
Earning per Share        
Net (loss) income $ (0.16) $ 0.15 $ (0.25) $ 0.22
Unvested restricted stock   $ (0.01)   $ (0.01)
Unsecured convertible note   $ (0.01)    
DILUTED (LOSS) EARNINGS PER SHARE $ (0.16) $ 0.13 $ (0.25) $ 0.21