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Subsequent Event - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified | 0 Months Ended
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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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- Definition 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 + Details
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