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Goodwill and IPR&D - Additional Information (Detail) - USD ($)
Sep. 30, 2015
Jun. 15, 2015
Indefinite-lived Intangible Assets [Line Items]    
Goodwill $ 15,942,000  
In-process research and development 7,534,000  
Ruthigen [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Goodwill 15,942,000 $ 15,942,000
Goodwill impairment loss 0  
In-process research and development 7,534,000 $ 7,534,000
Intangible assets impairment loss $ 0