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Acquisitions - Summary of Fair Value Consideration (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Contingent consideration   $ 11,635 $ 10,637
Medical Surgery Technologies Ltd. [Member]      
Business Acquisition [Line Items]      
Stock consideration $ 8,300    
Cash consideration 5,800    
Present value of deferred consideration 5,900    
Other consideration 314    
Total consideration $ 20,314