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Acquisitions and Divestitures - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Mar. 18, 2016
Dec. 31, 2015
May 31, 2015
Business Acquisition [Line Items]          
Goodwill $ 23,844 $ 23,426   $ 17,789  
Restore Flow Allografts [Member]          
Business Acquisition [Line Items]          
Accounts receivable 394        
Deferred cryopreservation costs 2,583        
Manufacturing equipment and supplies 125        
Accounts payable (286)        
Intangible assets 4,544        
Goodwill 5,599        
Purchase price 12,959        
ProCol Biologic Graft [Member]          
Business Acquisition [Line Items]          
Inventory 2,080        
Manufacturing equipment and supplies 25        
Intangible assets 620   $ 620    
Goodwill 318        
Purchase price $ 3,043        
Tru-Incise Valvulotome [Member]          
Business Acquisition [Line Items]          
Inventory         $ 88
Intangible assets         545
Goodwill         742
Purchase price         $ 1,375