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Long-Lived Assets - Textbook Library (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Property and equipment, gross	$ 27,569	$ 47,293
Less accumulated depreciation and amortization	(16,328)	(13,144)
Textbook library, net	11,241	34,149
Print textbook depreciation expense	10,859	15,397	$ 0
Loss (gain) on textbook library, net	$ 10,956	$ (1,453)	$ 0