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Sale of Domain Name - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
May 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Other Nonoperating Income And Expense [Line Items]            
Provision for income taxes   $ (8,804,000) $ (291,000)   $ (5,735,000) $ 6,419,000
Voice.com Domain Name            
Other Nonoperating Income And Expense [Line Items]            
Proceeds from third-party for sale of domain name $ 30,000,000.0          
Unamortized cost $ 0          
Provision for income taxes       $ 8,100,000    
Voice.com Domain Name | Other Income, Net            
Other Nonoperating Income And Expense [Line Items]            
Gain on sale of domain name       $ 29,800,000