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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accounting Policies [Abstract]        
Net income (loss) $ (4,580,255) $ (7,415,124) $ (20,420,945) $ (21,229,763)
Numerator, basic and diluted net income (loss) available to stockholders $ (4,580,255) $ (7,415,124) $ (20,420,945) $ (21,229,763)
Shares used in computation - basic:        
Weighted average common shares outstanding 89,781,577 85,271,429 88,655,418 84,707,367
Common shares outstanding for basic 89,781,577 85,271,429 88,655,418 84,707,367
Shares used in computation - diluted:        
Common shares outstanding for basic 89,781,577 85,271,429 88,655,418 84,707,367
Shares used in computing diluted net income per share 89,781,577 85,271,429 88,655,418 84,707,367
Net (loss) per share - basic $ (0.05) $ (0.09) $ (0.23) $ (0.25)
Net (loss) per share - diluted $ (0.05) $ (0.09) $ (0.23) $ (0.25)