Subsequent Events - Additional Information (Detail) - License and Collaboration Agreements [Member] - Baxalta [Member] - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Oct. 31, 2015	Jun. 30, 2015
Subsequent Event [Line Items]
Milestone achieved, amount		$ 20.0
Subsequent Event [Member] \| Phase 2 Clinical Trial in Pancreatic Cancer [Member]
Subsequent Event [Line Items]
Milestone achieved, amount	$ 47.5

The amount of consideration recognized during the period for the milestone or milestones.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 28

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=51671726&loc=SL6892177-166501

Name:	us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration