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Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Goodwill $ 24,442 $ 24,442
Telmetrics Acquisition    
Business Acquisition [Line Items]    
Cash and cash equivalents 359  
Accounts receivable 1,274  
Prepaid expenses and other current assets 586  
Property and equipment 281  
Identifiable intangible assets 6,351  
Liabilities assumed (885)  
Deferred tax liabilities (1,677)  
Net assets acquired 6,289  
Goodwill 5,411  
Total $ 11,700