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Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Disaggregation of Revenue [Line Items]          
Total net revenues $ 154,018 $ 94,151 $ 438,617 $ 285,422  
Change in total net revenues $ 59,867   $ 153,195    
Change in total net revenues, percent 64.00%   54.00%    
Contract with customer, liability, revenue recognized $ 25,400 15,700 $ 18,000 16,000  
Contract with customer, liability, revenue recognized, prior period   2,200   2,700  
Accounts receivable, net 12,487   12,487   $ 11,529
Change in accounts receivable     $ 958    
Change in accounts receivable, percent     8.00%    
Deferred revenue 51,941   $ 51,941   18,780
Change in deferred revenue     $ 33,161    
Change in deferred revenue, percent     177.00%    
Contract assets 8,214   $ 8,214   $ 3,531
Change in contract assets     $ 4,683    
Change in contract assets, percent     133.00%    
Textbook Library          
Disaggregation of Revenue [Line Items]          
Operating lease income 12,000   $ 35,400    
Chegg Services          
Disaggregation of Revenue [Line Items]          
Total net revenues 118,895 69,304 345,258 224,903  
Change in total net revenues $ 49,591   $ 120,355    
Change in total net revenues, percent 72.00%   54.00%    
Required Materials          
Disaggregation of Revenue [Line Items]          
Total net revenues $ 35,123 $ 24,847 $ 93,359 $ 60,519  
Change in total net revenues $ 10,276   $ 32,840    
Change in total net revenues, percent 41.00%   54.00%