Revenue Recognition - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) course term	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Graduation Fund [Line Items]
Number of free courses | course	1
Number of successfully completed courses | course	3
Consecutive terms of non attendance in which graduation fund credits will be lost | term	1
Expected collection period of tuition receivable	12 months
Graduation fund estimated to be redeemed	$ 18,100
Graduation fund liability	44,480	$ 46,842	$ 52,024
Undergraduate Degree Programs
Graduation Fund [Line Items]
Graduation fund liability	40,600	41,700
Tuition Cap
Graduation Fund [Line Items]
Contract liability	$ 11,800	$ 4,700
Minimum
Graduation Fund [Line Items]
Expected collection period of tuition receivable, noncurrent	2 years
Deferred acquisition costs, amortization period	1 year
Maximum
Graduation Fund [Line Items]
Expected collection period of tuition receivable, noncurrent	4 years
Deferred acquisition costs, amortization period	2 years