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Sale of Domain Name - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 30, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Nonoperating Income And Expense [Line Items] |  |  |  |  |
Provision for income taxes |  |  | $ (12,429,000) | $ 3,908,000 | $ (2,019,000)
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 |  |  |

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