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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
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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)

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