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Revenues (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]          
Total net revenues $ 74,237 $ 62,640 $ 225,408 $ 181,559  
Change in total net revenues $ 11,597   $ 43,849    
Change in total net revenues, percent 19.00%   24.00%    
Aggregate amount of unsatisfied performance obligations $ 29,000   $ 29,000    
Contract with customer, liability, revenue recognized 10,800   11,700    
Accounts receivable 8,620   8,620   $ 10,855
Deferred revenue 25,281   25,281   $ 13,440
Change in accounts receivable     $ (2,235)    
Change in accounts receivable, percent     (21.00%)    
Change in deferred revenue     $ 11,841    
Change in deferred revenue, percent     88.00%    
Enrollment Marketing          
Disaggregation of Revenue [Line Items]          
Change in deferred revenue 1,000   $ 2,100    
Chegg Services          
Disaggregation of Revenue [Line Items]          
Total net revenues 54,201 39,475 172,327 125,210  
Change in total net revenues $ 14,726   $ 47,117    
Change in total net revenues, percent 37.00%   38.00%    
Required Materials          
Disaggregation of Revenue [Line Items]          
Total net revenues $ 20,036 $ 23,165 $ 53,081 $ 56,349  
Change in total net revenues $ (3,129)   $ (3,268)    
Change in total net revenues, percent (14.00%)   (6.00%)