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Intangible Assets - Summary of Assets, Estimated Fair Values (Detail) (Ceregene, Inc. [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Finite-Lived Intangible Assets [Line Items] |  |
Total identifiable intangible assets | $ 1,870 | $ 1,870
CERE-110 for the treatment of Alzheimer's disease [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total identifiable intangible assets | 1,640 | 1,640
CERE-120 for the treatment of Parkinson's disease [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total identifiable intangible assets | $ 230 | $ 230

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