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Revenues - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Contract with customer, liability, revenue recognized | $ 35,200 | $ 31,300 | $ 33,800 | $ 32,600
Increase in accounts receivable, net |  |  | $ 4,337 |
Increase in accounts receivable, net, percent |  |  | 24.00% |
Decrease in contract assets |  |  | $ 1,521 |
Decrease in contract assets, percent |  |  | 11.00% |
Increase in deferred revenue |  |  | $ 25,332 |
Increase in deferred revenue, percent |  |  | 72.00% |
Textbook Library |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating lease income | $ 0 | $ 6,200 | $ 5,100 | $ 26,900

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