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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
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accounting Policies [Abstract]        
Net income (loss) $ (7,415,124) $ (931,393) $ (21,229,763) $ (21,492,748)
Numerator, basic and diluted net income (loss) available to stockholders $ (7,415,124) $ (931,393) $ (21,229,763) $ (21,492,748)
Shares used in computation - basic:        
Weighted average common shares outstanding 85,271,429 80,252,203 84,707,367 78,991,192
Common shares outstanding for basic 85,271,429 80,252,203 84,707,367 78,991,192
Shares used in computation - diluted:        
Common shares outstanding for basic 85,271,429 80,252,203 84,707,367 78,991,192
Shares used in computing diluted net income per share 85,271,429 80,252,203 84,707,367 78,991,192
Net (loss) per share - basic $ (0.09) $ (0.01) $ (0.25) $ (0.27)
Net (loss) per share - diluted $ (0.09) $ (0.01) $ (0.25) $ (0.27)