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Acquisitions - Summary of Initial Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 11, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 74,149   $ 70,557
Smadex      
Business Acquisition [Line Items]      
Accounts receivable   $ 900  
Other current assets   400  
Intangible assets subject to amortization   2,000  
Goodwill   3,600  
Current liabilities   (2,800)  
Long-term liabilities   (200)  
Deferred Tax   $ (400)