Receivables and Contract Liabilities - Trade Accounts Receivable and Contract Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Accounts receivable, before allowance for credit loss, current	$ 84,446	$ 78,973
Less: Provision for credit losses	(14,602)	(11,686)
Trade accounts receivable, net	69,844	67,287
Degree Program Segment
Segment Reporting Information [Line Items]
Accounts receivable, before allowance for credit loss, current	21,177	31,762
Degree Program Segment unbilled revenue	19,048	4,440
Alternative Credential Segment accounts receivable
Segment Reporting Information [Line Items]
Accounts receivable, before allowance for credit loss, current	$ 44,221	$ 42,771

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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