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Development, Commercialization and Supply Agreement - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 26, 2015	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
License And Collaboration Agreements [Line Items]
Licensing revenue			$ 293,000	$ 163,000	$ 825,000	$ 538,000
Deferred revenue			$ 15,400,000		15,400,000
Eddingpharm
License And Collaboration Agreements [Line Items]
Non-refundable up-front received	$ 15,000,000
Licensing agreement term	16 years
Eddingpharm | Maximum
License And Collaboration Agreements [Line Items]
Additional upfront payment eligible to receive based on development, regulatory and sales Milestone					$ 153,000,000
Eddingpharm | Clinical Trial Application
License And Collaboration Agreements [Line Items]
Licensing agreement term		4 years
Non-refundable milestone payment		$ 1,000,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.3)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.4(a).Q1)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
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