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Significant Accounting Policies (Details)	3 Months Ended				9 Months Ended
Significant Accounting Policies (Details)	Sep. 30, 2023 USD ($) segment	Jun. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($) reportingUnit	Mar. 31, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Jul. 01, 2023	Jan. 11, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 01, 2022 USD ($)	Apr. 30, 2020 USD ($)
Property and Equipment, Net
Goodwill impairment charge		$ 16,700,000	$ 50,200,000	$ 28,800,000	$ 16,717,000
Impairment of intangible assets, indefinite-lived (excluding goodwill)		$ 117,400,000	29,300,000	$ 30,000,000
Reporting units, percentage of fair value in excess of carrying amount	10.00%				10.00%
Net carrying amount	$ 883,090,000				$ 883,090,000			$ 936,144,000
Additional paid-in capital	(1,738,092,000)				(1,738,092,000)			(1,700,855,000)
Deferred tax liabilities, net	(310,000)				(310,000)			(282,000)
Accumulated deficit	(1,455,131,000)				(1,455,131,000)			$ (1,179,972,000)
Trade names
Property and Equipment, Net
Estimated useful life (in years)						25 years
Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2020-06
Property and Equipment, Net
Net carrying amount									$ 81,700,000
Additional paid-in capital									114,600,000
Deferred tax liabilities, net									22,100,000
Accumulated deficit									$ 32,800,000
The 2025 Notes \| Convertible senior notes
Property and Equipment, Net
Interest rate (as a percent)										2.25%
Principal										$ 380,000,000
2030 Notes \| Convertible senior notes
Property and Equipment, Net
Interest rate (as a percent)							4.50%
Principal	147,000,000				147,000,000		$ 147,000,000
Net carrying amount	$ 127,133,000				$ 127,133,000
Open Courses
Property and Equipment, Net
Goodwill impairment charge			43,000,000
Executive Education
Property and Equipment, Net
Goodwill impairment charge			$ 7,200,000
Alternative Credential Segment
Property and Equipment, Net
Number of reporting units \| segment	1	3
Number of reporting units with negative carrying amount \| reportingUnit			2
Degree Program Segment
Property and Equipment, Net
Number of reporting units \| segment					1