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Background and Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Textbook library, net	$ 34,575	$ 34,575		$ 0
Print textbook depreciation expense		10,699	$ 0
Gain on textbook library, net		$ (2,028)	$ 0
Textbook Library
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Estimated useful life		4 years
Textbook library, net	34,600	$ 34,600
Property, plant and equipment, gross	44,800	44,800
Accumulated depreciation	(9,200)	(9,200)
Write down		(1,000)
Print textbook depreciation expense	3,600	10,700
Gain on textbook library, net	$ (600)	$ (2,000)
Textbook Library | Minimum
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Contractual period		2 months
Textbook Library | Maximum
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Contractual period		5 months
eTextbooks | Minimum
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Contractual period		2 months
eTextbooks | Maximum
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Contractual period		5 months

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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.

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 210
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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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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