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Business Acquisitions - Immunologix, Inc. - Additional Information (Detail) (Immunologix, Inc. [Member], USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 12 Months Ended
Oct. 21, 2011
Dec. 31, 2011
Business Acquisition [Line Items]    
Percentage of outstanding common stock acquired 100.00%  
Fair Value of Consideration Transferred $ 13,850  
Business acquisition, consideration paid, shares issued 153,365  
Business acquisition, percentage of consideration required 50.00%  
Potential Contingent Consideration Arrangement 0  
Potential Contingent Consideration Arrangement 2,000  
Fair value of the contingent consideration arrangement 0  
Business combination, acquisition related cost   293
Patents and Related Technologies [Member]
   
Business Acquisition [Line Items]    
Acquired Intangible Assets, useful life 13 years  
Cash [Member]
   
Business Acquisition [Line Items]    
Fair Value of Consideration Transferred $ 12,758