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Net Loss per Common Share - Additional Information (Detail) - shares
Jun. 30, 2016
May 31, 2016
Nov. 30, 2015
Sep. 30, 2015
Net Income Loss Per Common Share [Line Items]        
Return of loaned common stock (in shares)       9,000,000
Shares loaned under the share lending arrangement 9,000,000      
Warrants to purchase of common stock     159,304  
A Warrants        
Net Income Loss Per Common Share [Line Items]        
Warrants to purchase of common stock   36,407,765    
Warrants outstanding 36,407,765      
B Warrants        
Net Income Loss Per Common Share [Line Items]        
Warrants to purchase of common stock   12,135,921    
Warrants outstanding 12,135,921