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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%) |

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