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Summary of Significant Accounting Policies (Details 4) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Reconciliation of the numerators and denominators used in computing basic and diluted net income per share        
Net income (loss) $ 3,802,983 $ (5,137,997) $ (17,269,166) $ (12,242,585)
Accretion of Series G Preferred Stock       (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   (105,000) (10,000) (343,479)
Numerator, basic and diluted net income (loss) available to stockholders $ 3,802,983 $ (5,242,997) $ (17,279,166) $ (15,480,191)
Shares used in computation - basic:        
Weighted average common shares outstanding 74,087,794 72,793,773 73,498,034 69,292,452
Additional shares from participating securities per the two class method 4,456,597      
Common shares outstanding for basic 78,544,391 72,793,773 73,498,034 69,292,452
Shares used in computation - diluted:        
Common shares outstanding for basic 78,544,391 72,793,773 73,498,034 69,292,452
Dilutive effect of potential common shares outstanding 2,896,457      
Shares used in computing diluted net income per share 81,440,848 72,793,773 73,498,034 69,292,452
Net income (loss) per share ? basic $ 0.05 $ (0.07) $ (0.24) $ (0.22)
Net income (loss) per share ? diluted $ 0.05 $ (0.07) $ (0.24) $ (0.22)