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Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Net revenues $ 205,721 $ 154,018 $ 153,009 $ 131,590 $ 125,504 $ 94,151 $ 93,862 $ 97,409 $ 644,338 $ 410,926 $ 321,084
Change in total net revenues                 $ 233,412 $ 89,842  
Change in total net revenues, percent                 57.00% 28.00%  
Contract with customer, liability, revenue recognized                 $ 18,300 $ 17,000 11,700
Contract with customer, liability, revenue recognized, prior period                   3,400  
Accounts receivable, net 12,913       11,529       12,913 11,529  
Change in accounts receivable                 $ 1,384    
Change in accounts receivable, percent                 12.00%    
Deferred revenue 32,620       18,780       $ 32,620 18,780  
Change in deferred revenue                 $ 13,840    
Change in deferred revenue, percent                 74.00%    
Contract assets 13,243       $ 3,531       $ 13,243 3,531  
Change in contract assets                 $ 9,712    
Change in contract assets, percent                 275.00%    
Chegg Services                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 $ 521,228 332,221 253,985
Change in total net revenues                 $ 189,007 $ 78,236  
Change in total net revenues, percent                 57.00% 31.00%  
Required Materials                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 $ 123,110 $ 78,705 $ 67,099
Change in total net revenues                 $ 44,405 $ 11,606  
Change in total net revenues, percent                 56.00% 17.00%  
Textbook Library                      
Disaggregation of Revenue [Line Items]                      
Operating lease income $ 50,800