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Restructuring and Other Costs - Restructuring and Related Costs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring And Related Activities [Abstract]
Severance benefits	$ 9,350,000
Asset impairments and lease termination costs	2,538,000
Gain on fair value remeasurement of cost and equity method investments	(1,099,000)
Liquidation dividend from a cost method investment	(1,247,000)
Gain on sale of internet protocol addresses	(1,409,000)
Total restructuring and other costs, net	$ 8,133,000	$ 0	$ 0

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Gain on fair value remeasurement of cost and equity method investments.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of restructuring charges, remediation cost, and asset impairment loss.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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