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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 |  |  |  |  |  |  |  |  |  |

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