Other Balance Sheet Details - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Payables and Accruals [Abstract]
Accrued university and instructional staff compensation	$ 28,884	$ 36,806
Accrued marketing expenses	33,430	26,469
Accrued transaction and integration expenses	18,545	4,072
Accrued compensation and related benefits	40,549	49,143
Accounts payable and other accrued expenses	28,673	48,233
Total accounts payable and accrued expenses	$ 150,081	$ 164,723