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Revenues - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Contract with customer, liability, revenue recognized	$ 31,300	$ 25,400	$ 32,600	$ 18,000
Contract with customer, liability, revenue recognized, prior period	0		3,400
Accounts receivable, net			$ (3,611)
Accounts receivable, net, percent			(28.00%)
Deferred revenue			$ 17,363
Deferred revenue, percent			53.00%
Contract assets			$ 3,115
Contract assets, percent			24.00%
Textbook Library
Disaggregation of Revenue [Line Items]
Operating lease income	$ 6,200	$ 12,000	$ 26,900	$ 35,400

X

- Definition

Contract With Customer, Liability, Revenue Recognized, Prior Period

+ References

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- Definition

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
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+ References

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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