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Equity - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 23,213	$ 20,316	$ 32,857
Amount capitalized for internal-use software	1,040	1,885	2,621
Total stock-based compensation	24,253	22,201	35,478
Marketing and advertising
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	2,201	1,901	8,660
Customer care and enrollment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	2,287	2,096	2,836
Technology and content
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	4,498	6,015	10,013
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 14,227	$ 10,304	$ 11,348

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