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Redeemable Convertible Preferred Stock and Common Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 15, 2015 | May. 31, 2014 | Sep. 30, 2015 | Dec. 31, 2014
Temporary Equity [Line Items] |  |  |  |
Preferred stock, shares outstanding |  |  |  | 63,413,042
Securities Purchase Agreement [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Gross proceeds from issuance of private placement | $ 10,000 |  |  |
Merger Agreement [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Exercise price per share of warrants | $ 7.563 |  |  |
Common stock shares converted after merger | 1,454,553 |  |  |
Warrants converted after merger | 3,190,030 |  |  |
Common Stock [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Preferred stock converted to common stock | 70,105,854 |  |  |
Common stock issued |  |  | 2,540,910 |
Ruthigen [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Common stock issued |  | 136,000 |  |
Private Placement [Member] | Securities Purchase Agreement [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Securities purchase agreement, units sold | 24,538,999 |  |  |
Securities purchase agreement, common stock per unit | 1 |  |  |
Securities purchase agreement, warrant per unit | 2.193140519 |  |  |
Exercise price per share of warrants | $ 0.448266 |  |  |
Private Placement [Member] | Ruthigen [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Gross proceeds from issuance of private placement |  |  | $ 2,600 |
Common stock issued | 379,387 | 379,387 | 379,387 |
Common stock, price per share |  | $ 6.875 | $ 6.875 |
Redeemable Convertible Preferred Stock [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Preferred stock, shares outstanding | 63,413,042 |  |  |

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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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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph b -Article 5 + Details
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