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Warrants - Warrants Assumed in Merger - Additional Information (Detail) - $ / shares |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 15, 2015 | May. 31, 2014 | Sep. 30, 2015
Series A Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of warrants issued |  |  | 1,219,000
Ruthigen [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Common stock issued |  | 136,000 |
Ruthigen [Member] | Warrant [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant exercise price |  |  | $ 22.65625
Number of shares issued under over allotment option |  |  | 37,100
Ruthigen [Member] | Private Placement [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Common stock issued | 379,387 | 379,387 | 379,387
Common stock, price per share |  | $ 6.875 | $ 6.875
Ruthigen [Member] | Over-Allotment Option [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant exercise price |  |  | $ 22.65625
Number of shares issued under over allotment option |  |  | 2,160
Ruthigen [Member] | Series A Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant exercise price |  | $ 17.83 |
Ruthigen [Member] | Series A Warrants [Member] | IPO [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of warrants issued |  | 1,219,000 |
Warrant exercise price |  | $ 18.125 |
Warrant per share |  | 0.4 |
Consideration for warrants |  | $ 0.00025 |
Ruthigen [Member] | Series A Warrants [Member] | IPO [Member] | Period of 20 Consecutive Business Days [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant exercise price |  | 18.125 |
Ruthigen [Member] | Series B Warrant [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant exercise price |  | 22.28 |
Ruthigen [Member] | Series B Warrant [Member] | IPO [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant exercise price |  | $ 22.65625 |
Warrant per share |  | 0.4 |

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- Definition Exercise price of the warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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