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Acquisition of Ceregene - Summary of Assets, Estimated Fair Values (Detail) (Ceregene, Inc. [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Business Acquisition [Line Items]
Value of Intangible Assets Acquired	$ 1,870
CERE-110 for the treatment of Alzheimer's disease [Member]
Business Acquisition [Line Items]
Value of Intangible Assets Acquired	1,640
CERE-120 for the treatment of Parkinson's disease [Member]
Business Acquisition [Line Items]
Value of Intangible Assets Acquired	$ 230

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- Definition

The amount of identifiable intangible assets recognized as of 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=6910749&loc=d3e4845-128472



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 55

-Paragraph 37

-URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464

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