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Acquisitions - Summary of Preliminary Estimated Fair Value of the Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Goodwill $ 24,442 $ 24,442
Callcap Acquisition    
Business Acquisition [Line Items]    
Cash and cash equivalents 490  
Accounts receivable 246  
Prepaid expenses and other current assets 504  
Property and equipment 93  
Identifiable intangible assets 15,128  
Liabilities assumed (482)  
Net assets acquired 15,979  
Goodwill 19,031  
Total $ 35,010