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Product Acquisitions - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]      
Number of business acquisitions | Business   2  
Acquisitions of intangible assets $ 224 $ 36,667  
Fair value increase (decrease) (22) 65 $ (32)
Product acquisition and licensing agreements obligation, Other Liability 815    
Operating expenses      
Business Acquisition [Line Items]      
Fair value increase (decrease) $ (22) $ 65 $ (32)
Product Rights      
Business Acquisition [Line Items]      
Expected useful life 25 years    
Customer Lists      
Business Acquisition [Line Items]      
Expected useful life 10 years    
Trademarks      
Business Acquisition [Line Items]      
Expected useful life 25 years