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Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators used in Computing Basic and Diluted Net Income Per Share (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accounting Policies [Abstract]        
Net income (loss) $ (931,393) $ 3,802,983 $ (21,492,748) $ (17,269,166)
Cumulative dividends on Series G Preferred Stock       (10,000)
Numerator, basic and diluted net income (loss) available to stockholders $ (931,393) $ 3,802,983 $ (21,492,748) $ (17,279,166)
Shares used in computation - basic:        
Weighted average common shares outstanding 80,252,203 74,087,794 78,991,192 73,498,034
Additional shares from participating securities per the two-class method   4,456,597    
Common shares outstanding for basic 80,252,203 78,544,391 78,991,192 73,498,034
Shares used in computation - diluted:        
Common shares outstanding for basic 80,252,203 78,544,391 78,991,192 73,498,034
Dilutive effect of potential common shares outstanding   2,896,457    
Shares used in computing diluted net income per share 80,252,203 81,440,848 78,991,192 73,498,034
Net income (loss) per share - basic $ (0.01) $ 0.05 $ (0.27) $ (0.24)
Net income (loss) per share - diluted $ (0.01) $ 0.05 $ (0.27) $ (0.24)