Goodwill and Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill by Reportable Segment (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Beginning balance	$ 26,563,000	$ 26,563,000
Goodwill acquired	217,203,000
Impairment of goodwill	0	0	$ (7,336,000)
Adjustments	(280,000)
Ending balance	243,486,000	26,563,000	26,563,000
APUS Segment
Goodwill [Roll Forward]
Beginning balance	0	0
Goodwill acquired	0
Impairment of goodwill	0	0
Adjustments	0
Ending balance	0	0	0
RU Segment
Goodwill [Roll Forward]
Beginning balance	0	0
Goodwill acquired	217,203,000
Impairment of goodwill	0	0
Adjustments	(280,000)
Ending balance	216,923,000	0	0
HCN Segment
Goodwill [Roll Forward]
Beginning balance	26,563,000	26,563,000
Goodwill acquired	0
Impairment of goodwill	0	0	(7,300,000)
Adjustments	0
Ending balance	$ 26,563,000	$ 26,563,000	$ 26,563,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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