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Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Total net revenues $ 198,378 $ 131,590  
Change in total net revenues $ 66,788    
Change in total net revenues, percent 51.00%    
Contract with customer, liability, revenue recognized $ 29,500 17,500  
Accounts receivable, net 11,633   $ 12,913
Change in accounts receivable $ (1,280)    
Change in accounts receivable, percent (10.00%)    
Deferred revenue $ 48,608   32,620
Change in deferred revenue $ 15,988    
Change in deferred revenue, percent 49.00%    
Contract assets $ 18,043   $ 13,243
Change in contract assets $ 4,800    
Change in contract assets, percent 36.00%    
Chegg Services      
Disaggregation of Revenue [Line Items]      
Total net revenues $ 162,351 100,359  
Change in total net revenues $ 61,992    
Change in total net revenues, percent 62.00%    
Required Materials      
Disaggregation of Revenue [Line Items]      
Total net revenues $ 36,027 31,231  
Change in total net revenues $ 4,796    
Change in total net revenues, percent 15.00%    
Textbook Library      
Disaggregation of Revenue [Line Items]      
Operating lease income $ 10,700 $ 12,300