Revenue Recognition - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) course segment
Graduation Fund [Line Items]
Number of free courses	1
Number of successfully completed courses	3
Consecutive terms of non attendance in which Graduation Fund credits will be lost	1
Limitation of consecutive terms of non attendance to retain graduation fund credits without loss | segment	3
Expected collection period of tuition receivable	12 months
Current Liability
Graduation Fund [Line Items]
Graduation fund estimated to be redeemed | $	$ 19.5
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