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Summary of Estimated Fair Values of Separately Identifiable Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Jul. 31, 2015
Dec. 31, 2014
Jul. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 57,450   $ 56,955
Pathfinder Therapeutics Inc      
Business Acquisition [Line Items]      
Inventory and receivables 200    
Goodwill 400 $ 400  
Intangible assets 1,100    
Total assets acquired 1,700    
Accrued liabilities (100)    
Total liabilities assumed (100)    
Total purchase price 1,600    
Pathfinder Therapeutics Inc | Developed technologies      
Business Acquisition [Line Items]      
Intangible assets 700    
Pathfinder Therapeutics Inc | Customer relationships      
Business Acquisition [Line Items]      
Intangible assets 300    
Pathfinder Therapeutics Inc | Trade names      
Business Acquisition [Line Items]      
Intangible assets $ 100