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Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disaggregation of Revenue [Line Items]          
Total net revenues $ 153,009 $ 93,862 $ 284,599 $ 191,271  
Change in total net revenues $ 59,147   $ 93,328    
Change in total net revenues, percent 63.00%   49.00%    
Contract with customer, liability, revenue recognized $ 33,400 19,900 $ 17,800 13,600  
Contract with customer, liability, revenue recognized, prior period   700   700  
Accounts receivable, net 8,834   8,834   $ 11,529
Change in accounts receivable     $ (2,695)    
Change in accounts receivable, percent     (23.00%)    
Deferred revenue 28,320   $ 28,320   18,780
Change in deferred revenue     $ 9,540    
Change in deferred revenue, percent     51.00%    
Contract assets 4,742   $ 4,742   $ 3,531
Change in contract assets     $ 1,211    
Change in contract assets, percent     34.00%    
Textbook Library          
Disaggregation of Revenue [Line Items]          
Operating lease income 11,100   $ 23,400    
Chegg Services          
Disaggregation of Revenue [Line Items]          
Total net revenues 126,004 80,307 226,363 155,599  
Change in total net revenues $ 45,697   $ 70,764    
Change in total net revenues, percent 57.00%   45.00%    
Required Materials          
Disaggregation of Revenue [Line Items]          
Total net revenues $ 27,005 $ 13,555 $ 58,236 $ 35,672  
Change in total net revenues $ 13,450   $ 22,564    
Change in total net revenues, percent 99.00%   63.00%