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Summary of Significant Accounting Policies - Schedule of Dilutive Securities Excluded from Computation of Diluted Net Income Per Share (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]        
Net income (loss) $ 2,944,149 $ 10,466,582 $ 8,361,755 $ 6,717,120
Less: undistributed earnings allocated to participating securities (2,944,149) (10,466,582) (8,361,755) (6,717,120)
Net income (loss) allocable to common shares 0 0 0 0
Basic weighted average common shares outstanding 1,463,798 1,078,145 1,083,286 1,025,602
Basic income (loss) per common share $ 0.00 $ 0.00 $ 0.00 $ 0.00
Net income (loss) 2,944,149 10,466,582 8,361,755 6,717,120
Less: undistributed earnings allocated to participating securities and other add-backs to net income (loss) (2,944,149) (10,466,582) (8,361,755) (6,717,120)
Net income (loss) allocable to common shares $ 0 $ 0 $ 0 $ 0
Basic weighted average common shares outstanding 1,463,798 1,078,145 1,083,286 1,025,602
Effect of dilutive securities 20,445,061 20,334,703 0 0
Diluted weighted average common shares outstanding 21,908,859 21,412,848 1,083,286 1,025,602
Diluted income per common share $ 0.00 $ 0.00 $ 0.00 $ 0.00