Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information [Line Items]
Measurement period adjustment to reduce transition tax						$ 3,100
Digital asset impairment losses	$ 26,500	$ 44,200		$ 70,698	$ 0	0
Provision for income taxes				$ (12,429)	$ 3,908	$ (2,019)
Voice.com Domain Name
Quarterly Financial Information [Line Items]
Provision for income taxes			$ 8,100
Voice.com Domain Name | Other Income, Net
Quarterly Financial Information [Line Items]
Gain on sale of domain name			$ 29,800