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Redeemable Convertible Preferred Stock and Common Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 15, 2015
May. 31, 2014
Sep. 30, 2015
Dec. 31, 2014
Temporary Equity [Line Items]        
Preferred stock, shares outstanding       63,413,042
Securities Purchase Agreement [Member]        
Temporary Equity [Line Items]        
Gross proceeds from issuance of private placement $ 10,000      
Merger Agreement [Member]        
Temporary Equity [Line Items]        
Exercise price per share of warrants $ 7.563      
Common stock shares converted after merger 1,454,553      
Warrants converted after merger 3,190,030      
Common Stock [Member]        
Temporary Equity [Line Items]        
Preferred stock converted to common stock 70,105,854      
Common stock issued     2,540,910  
Ruthigen [Member]        
Temporary Equity [Line Items]        
Common stock issued   136,000    
Private Placement [Member] | Securities Purchase Agreement [Member]        
Temporary Equity [Line Items]        
Securities purchase agreement, units sold 24,538,999      
Securities purchase agreement, common stock per unit 1      
Securities purchase agreement, warrant per unit 2.193140519      
Exercise price per share of warrants $ 0.448266      
Private Placement [Member] | Ruthigen [Member]        
Temporary Equity [Line Items]        
Gross proceeds from issuance of private placement     $ 2,600  
Common stock issued 379,387 379,387 379,387  
Common stock, price per share   $ 6.875 $ 6.875  
Redeemable Convertible Preferred Stock [Member]        
Temporary Equity [Line Items]        
Preferred stock, shares outstanding 63,413,042