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Acquisition and Divestitures - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Mar. 18, 2016
Business Acquisition [Line Items]      
Goodwill $ 23,602 $ 23,844  
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
Goodwill     318
Purchase price     $ 3,043