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Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]    
Goodwill $ 19,132 $ 33,433
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 5,472  
Total 11,761  
Sonar Acquisition    
Business Acquisition [Line Items]    
Cash and cash equivalents 480  
Accounts receivable 141  
Prepaid expenses and other current assets 42  
Property and equipment 25  
Identifiable intangible assets 5,052  
Liabilities assumed (171)  
Deferred tax liabilities (1,184)  
Net assets acquired 4,385  
Goodwill 8,842  
Total 13,227  
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