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Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Net revenues $ 125,504 $ 94,151 $ 93,862 $ 97,409 $ 95,676 $ 74,237 $ 74,222 $ 76,949 $ 410,926 $ 321,084 $ 255,066
Change in total net revenues                 $ 89,842 $ 66,018  
Change in total net revenues, percent                 28.00% 26.00%  
Contract with customer, liability, revenue recognized                 $ 17,000 $ 11,700  
Contract with customer, liability, revenue recognized, prior period                 3,400    
Aggregate amount of unsatisfied performance obligations 18,800               18,800    
Accounts receivable 11,529       12,733       11,529 12,733  
Deferred revenue 18,780       17,418       18,780 17,418  
Contract with Customer, Asset, Net, Current $ 3,531       $ 337       3,531 337  
Change in accounts receivable                 $ (1,204)    
Change in accounts receivable, percent                 (9.00%)    
Change in deferred revenue                 $ 1,362    
Change in deferred revenue, percent                 8.00%    
Change in contract assets                 $ 3,194    
Chegg Services                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 332,221 253,985 185,683
Change in total net revenues                 $ 78,236 $ 68,302  
Change in total net revenues, percent                 31.00% 37.00%  
Required Materials                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 $ 78,705 $ 67,099 $ 69,383
Change in total net revenues                 $ 11,606 $ (2,284)  
Change in total net revenues, percent                 17.00% (3.00%)