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Acquisition of Ceregene - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013
Business Acquisition [Line Items] |
Excess of consideration transferred over the fair values assigned to assets acquired and liabilities assumed | $ 1,585,000
Goodwill related to deferred tax liability | 700,000
Fair value liability for contingent consideration recognized | 1,570,000
Ceregene, Inc. [Member] |
Business Acquisition [Line Items] |
Common stock, transferred, shares | 100,000
Common stock, transferred, value | 1,200,000
Purchase price deposited in escrow account | 300,000
Estimated fair values of in-process research and development | 1,900,000
Excess of consideration transferred over the fair values assigned to assets acquired and liabilities assumed | 1,585,000
Changes in the Goodwill | 0
Fair value liability for contingent consideration recognized | 1,500,000
Acquisition-related transaction expenses | 100,000
Acquisition related operating expenses | $ 0

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