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Background and Basis of Presentation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Textbook library, net | $ 27,129 | $ 27,129 |  | $ 0
Print textbook depreciation expense |  | 7,062 | $ 0 |
Gain on textbook library, net |  | $ (1,371) | $ 0 |
Textbook Library |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Estimated useful life |  | 4 years |  |
Textbook library, net | 27,100 | $ 27,100 |  |
Property, plant and equipment, gross | 33,700 | 33,700 |  |
Accumulated depreciation | (6,400) | (6,400) |  |
Write down |  | (100) |  |
Print textbook depreciation expense | 3,600 | 7,100 |  |
Gain on textbook library, net | $ (200) | $ (1,400) |  |
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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