Revenue Recognition - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) course term
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 current tuition receivable	12 months
Graduation fund estimated to be redeemed | $	$ 20.8
Unbilled receivables | $	$ 0.5
Minimum
Graduation Fund [Line Items]
Expected collection period of noncurrent tuition receivable	2 years
Deferred acquisition costs, amortization period	1 year
Maximum
Graduation Fund [Line Items]
Expected collection period of noncurrent tuition receivable	4 years
Deferred acquisition costs, amortization period	2 years