Revenue Recognition Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) course
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
Expected collection period of tuition receivable	12 months
Unbilled receivables | $	$ 0.9
Current Liability
Graduation Fund [Line Items]
Graduation fund estimated to be redeemed | $	$ 20.8
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