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Business Acquisitions - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Apr. 12, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]      
Business acquisitions, net of cash acquired   $ 0 $ 4,446
InPharmics LLC      
Business Acquisition [Line Items]      
Business acquisitions, net of cash acquired $ 5,000    
Cash on hand at signing 300    
Contingent consideration liability 500    
Intangibles $ 1,900