Goodwill and Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	$ 40,826	$ 40,826
Accumulated Amortization	36,251	25,313
Net Carrying Amount	4,575	15,513
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross carrying amount, before impairment	54,721	54,721
Impairment	26,500	15,500
Gross/net carrying amount	28,221	39,221
Total intangible assets, Gross	95,547	95,547
Total intangible assets, Impairment	26,500	15,500
Total intangible assets, net	32,796	54,734
Trade name
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross carrying amount, before impairment	28,498	28,498
Impairment	8,000
Gross/net carrying amount	20,498	28,498
Accreditation, licensing, and Title IV
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross carrying amount, before impairment	26,186	26,186
Impairment	18,500	15,500
Gross/net carrying amount	7,686	10,686
Affiliation agreements
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross carrying amount, before impairment	37	37
Gross/net carrying amount	37	37
Student roster
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	20,000	20,000
Accumulated Amortization	20,000	13,333
Net Carrying Amount	0	6,667
Curricula
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	14,563	14,563
Accumulated Amortization	10,219	6,680
Net Carrying Amount	4,344	7,883
Student and customer contracts and relationships
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	4,614	4,614
Accumulated Amortization	4,391	4,168
Net Carrying Amount	223	446
Lead conversions
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	1,500	1,500
Accumulated Amortization	1,500	1,000
Net Carrying Amount	0	500
Non-compete agreements
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	86	86
Accumulated Amortization	86	86
Net Carrying Amount	0	0
Tradename
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	35	35
Accumulated Amortization	35	35
Net Carrying Amount	0	0
Accreditation and licenses
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	28	28
Accumulated Amortization	20	11
Net Carrying Amount	$ 8	$ 17