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Acquisitions - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Oct. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 79,509 $ 80,131  
Medical Surgery Technologies Ltd. [Member]      
Business Acquisition [Line Items]      
Property and equipment     $ 43
In-process research and development     10,633
Goodwill $ 9,600   9,638
Net assets acquired     $ 20,314