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Required Materials Transition (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Apr. 30, 2022
Impaired Long-Lived Assets Held and Used [Line Items]        
Print textbook depreciation expense $ 1,610 $ 10,859 $ 15,397  
Net gain (loss) on textbook library (4,976) $ 10,956 $ (1,453)  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GT Marketplace, LLC        
Impaired Long-Lived Assets Held and Used [Line Items]        
Consideration received on sale       $ 14,000
Gain from sale $ 4,400      
Disposal Group, Held-for-sale, Not Discontinued Operations | GT Marketplace, LLC        
Impaired Long-Lived Assets Held and Used [Line Items]        
Assets held for sale       $ 7,700