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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
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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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