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Background and Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Textbook library, net	$ 31,673		$ 0
Property and equipment, net	97,889		$ 87,359
Gain on textbook library, net	$ (1,175)	$ 0
Textbook Library
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Estimated useful life	4 years
Textbook library, net	$ 31,700
Property, plant and equipment, gross	35,100
Accumulated depreciation	(3,400)
Print textbook depreciation expense	3,500
Gain on textbook library, net	$ (1,200)

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- Definition

Gain and write-down on textbook library

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- Definition

Carrying amount as of the balance sheet date of amounts paid for textbooks which met the criteria for capitalization, net of related accumulated depreciation, which is expected to be used beyond one year.

+ References

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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