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Warrants - Warrants Assumed in Merger - Additional Information (Detail) - $ / shares
3 Months Ended 9 Months Ended
Jun. 15, 2015
May. 31, 2014
Sep. 30, 2015
Series A Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of warrants issued     1,219,000
Ruthigen [Member]      
Class of Warrant or Right [Line Items]      
Common stock issued   136,000  
Ruthigen [Member] | Warrant [Member]      
Class of Warrant or Right [Line Items]      
Warrant exercise price     $ 22.65625
Number of shares issued under over allotment option     37,100
Ruthigen [Member] | Private Placement [Member]      
Class of Warrant or Right [Line Items]      
Common stock issued 379,387 379,387 379,387
Common stock, price per share   $ 6.875 $ 6.875
Ruthigen [Member] | Over-Allotment Option [Member]      
Class of Warrant or Right [Line Items]      
Warrant exercise price     $ 22.65625
Number of shares issued under over allotment option     2,160
Ruthigen [Member] | Series A Warrants [Member]      
Class of Warrant or Right [Line Items]      
Warrant exercise price   $ 17.83  
Ruthigen [Member] | Series A Warrants [Member] | IPO [Member]      
Class of Warrant or Right [Line Items]      
Number of warrants issued   1,219,000  
Warrant exercise price   $ 18.125  
Warrant per share   0.4  
Consideration for warrants   $ 0.00025  
Ruthigen [Member] | Series A Warrants [Member] | IPO [Member] | Period of 20 Consecutive Business Days [Member]      
Class of Warrant or Right [Line Items]      
Warrant exercise price   18.125  
Ruthigen [Member] | Series B Warrant [Member]      
Class of Warrant or Right [Line Items]      
Warrant exercise price   22.28  
Ruthigen [Member] | Series B Warrant [Member] | IPO [Member]      
Class of Warrant or Right [Line Items]      
Warrant exercise price   $ 22.65625  
Warrant per share   0.4