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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
Mar. 31, 2014
Mar. 31, 2013
Accounting Policies [Abstract]    
Net income (loss) $ (9,798,757) $ (9,665,379)
Numerator, basic and diluted net income (loss) available to stockholders $ (9,798,757) $ (9,665,379)
Shares used in computation - basic:    
Weighted average common shares outstanding 83,937,883 77,344,388
Common shares outstanding for basic 83,937,883 77,344,388
Shares used in computation - diluted:    
Common shares outstanding for basic 83,937,883 77,344,388
Dilutive effect of potential common shares outstanding      
Shares used in computing diluted net income per share 83,937,883 77,344,388
Net income (loss) per share - basic $ (0.12) $ (0.12)
Net income (loss) per share - diluted $ (0.12) $ (0.12)