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Sale of Domain Name - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
May 30, 2019
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Other Nonoperating Income And Expense [Line Items]            
Provision for income taxes   $ (291,000)   $ (1,240,000) $ 6,419,000 $ (699,000)
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   $ 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   $ 29,800,000