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Summary of Significant Accounting Policies - Basic and Diluted Net Loss per Share Computations (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accounting Policies [Abstract]        
Net loss $ (2,757,186) $ (7,191,653) $ (22,492,666) $ (19,476,782)
Weighted average shares outstanding used to compute basic and diluted net income or loss per share 66,535,000 41,402,717 59,224,989 39,787,527
Basic and diluted net loss per share $ (0.04) $ (0.17) $ (0.38) $ (0.49)