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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

X

- 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

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+ References

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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))



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-Section S99



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-SubTopic 10



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-Name Regulation S-X (SX)



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-Section 02



-Paragraph 29, 30



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