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Merger - Summary of Acquisition Date Fair Value of Consideration Transferred (Parenthetical) (Detail) - shares |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 15, 2015 | May. 31, 2014 | Jun. 30, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |
Common stock outstanding |  |  | 14,646,108 | 188,625
Ruthigen [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Common stock outstanding | 1,921,716 |  |  |
Common stock issued |  | 136,000 |  |
Employee [Member] | Ruthigen [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Common stock issued | 36,000 |  |  |
Restricted Stock Units [Member] | Ruthigen [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Common stock issued | 67,732 |  |  |
Private Placement [Member] | Ruthigen [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Common stock issued | 379,387 | 379,387 | 379,387 |

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