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Goodwill and IPR&D - Additional Information (Detail) - USD ($) | Sep. 30, 2015 | Jun. 15, 2015
--- | --- | ---
Indefinite-lived Intangible Assets [Line Items] |  |
Goodwill | $ 15,942,000 |
In-process research and development | 7,534,000 |
Ruthigen [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Goodwill | 15,942,000 | $ 15,942,000
Goodwill impairment loss | 0 |
In-process research and development | 7,534,000 | $ 7,534,000
Intangible assets impairment loss | $ 0 |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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