Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 606,328	$ 418,803	$ 321,785
Costs and expenses:
Instructional costs and services	288,472	172,622	122,161
Selling and promotional	154,649	93,317	72,989
General and administrative	120,352	103,379	88,043
Loss on disposals of long-lived assets	1,176	1,282	851
Impairment of goodwill and intangible assets	146,900	0	0
Depreciation and amortization	32,127	17,832	12,984
Total costs and expenses	743,676	388,432	297,028
Income (loss) from operations before interest and income taxes	(137,348)	30,371	24,757
Gain on acquisition (Note 3)	3,828	0	0
Interest income (expense)	(17,728)	(4,277)	1,092
Income (loss) from operations before income taxes	(151,248)	26,094	25,849
Income tax expense (benefit)	(36,276)	7,511	7,020
Equity investment loss	(21)	(831)	(7)
Net income (loss)	(114,993)	17,752	18,822
Preferred stock dividends	48	0	0
Net income available to common stockholders basic	(115,041)	17,752	18,822
Net income available to common stockholders diluted	$ (115,041)	$ 17,752	$ 18,822
Net income (loss) per common share:
Basic (in dollars per share)	$ (6.10)	$ 0.98	$ 1.27
Diluted (in dollars per share)	$ (6.08)	$ 0.97	$ 1.25
Weighted average number of shares outstanding:
Basic (in shares)	18,859	18,085	14,876
Diluted (in shares)	18,914	18,255	15,047