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Merger - Summary of Acquisition Date Fair Value of Consideration Transferred (Detail) - Jun. 15, 2015 - Ruthigen [Member] - USD ($) $ / shares in Units, $ in Thousands	Total
Business Acquisition [Line Items]
Number of shares of Company Common Stock owned by Ruthigen stockholders	2,404,835
Multiplied by the price per share of Company Common Stock	$ 12.65
Total consideration transferred	$ 30,421

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Number of shares of equity interests issued or issuable to acquire entity.

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