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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accounting Policies [Abstract]        
Net income (loss) $ (10,895,976) $ (15,590,350) $ (20,561,356) $ (21,072,148)
Cumulative dividends on Series G Preferred Stock   (5,000)   (15,000)
Numerator, basic and diluted net income (loss) available to stockholders $ (10,895,976) $ (15,595,350) $ (20,561,356) $ (21,087,148)
Shares used in computation - basic:        
Weighted average common shares outstanding 79,345,030 73,234,692 78,350,236 73,199,914
Shares used in computation - diluted:        
Weighted average common shares outstanding 79,345,030 73,234,692 78,350,236 73,199,914
Dilutive effect of potential common shares outstanding            
Shares used in computing diluted net income per share 79,345,030 73,234,692 78,350,236 73,199,914
Net income (loss) per share - basic $ (0.14) $ (0.21) $ (0.26) $ (0.29)
Net income (loss) per share - diluted $ (0.14) $ (0.21) $ (0.26) $ (0.29)