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Subsequent Event - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Jan. 08, 2014 Program
Subsequent Event [Line Items]
Number of research programs	2
Upfront license fee	$ 20.0
Milestone payments	293.8
Beta-thalassemia [Member]
Subsequent Event [Line Items]
Milestone payments	7.5
Sickle cell disease [Member]
Subsequent Event [Line Items]
Milestone payments	$ 7.5

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Costs incurred and are directly related to generating license revenue. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark.

+ 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 210.5-03.2(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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