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Acquisition of Ceregene - Additional Information (Detail) (USD $)
 12 Months Ended
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