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Summary of Significant Accounting Policies (Details 4) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Reconciliation of the numerators and denominators used in computing basic and diluted net income per share |  |  |  |
Net loss | $ (15,590,350) | $ (1,930,553) | $ (21,072,148) | $ (7,104,588)
Accretion of Series G Preferred Stock |  | (1,564,578) |  | (1,987,977)
Fair market value of warrants issued to Series G Preferred Stock stockholders |  | (906,150) |  | (906,150)
Cumulative dividends on Series G Preferred Stock | (5,000) | (105,000) | (15,000) | (238,479)
Numerator, basic and diluted net income (loss) available to stockholders | $ (15,595,350) | $ (4,506,281) | $ (21,087,194) | $ (10,237,194)
Shares used in computation - basic: |  |  |  |
Weighted average common shares outstanding | 73,234,692 | 67,873,487 | 73,199,914 | 67,512,776
Shares used in computation - diluted: |  |  |  |
Shares used in computing diluted net income per share | 73,234,692 | 67,873,487 | 73,199,914 | 67,512,776
Dilutive effect of potential common shares outstanding |  |  |  |
Net loss per share - basic | $ (0.21) | $ (0.07) | $ (0.29) | $ (0.15)
Net loss per share - diluted | $ (0.21) | $ (0.07) | $ (0.29) | $ (0.15)

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