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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net loss from continuing operations $ (9,642,647) $ (2,619,594) $ (27,455,062) $ (22,153,018)
Net loss from discontinued operations   (137,592)   (339,648)
Net loss $ (9,642,647) $ (2,757,186) $ (27,455,062) $ (22,492,666)
Weighted average shares outstanding used to compute basic and diluted net income or loss per share 108,478,361 66,535,000 91,106,853 59,224,989
Basic and diluted net loss per share from continuing operations $ (0.09) $ (0.04) $ (0.30) $ (0.38)
Basic and diluted net loss per share from discontinued operations 0 0 0 0
Basic and diluted net loss per share $ (0.09) $ (0.04) $ (0.30) $ (0.38)