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Merger - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 15, 2015
Business Acquisition [Line Items]    
In-process research and development $ 7,534  
Goodwill 15,942  
Deferred tax liability (2,959)  
Ruthigen [Member]    
Business Acquisition [Line Items]    
Cash and cash equivalents   $ 9,671
In-process research and development 7,534 7,534
Goodwill $ 15,942 15,942
Property and equipment   156
Prepaid and other current assets   140
Total assets acquired   33,443
Accrued expenses and other current liabilities   (63)
Deferred tax liability   (2,959)
Total liabilities assumed   (3,022)
Total net assets acquired   $ 30,421