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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total net revenues	$ 171,942	$ 154,018	$ 568,798	$ 438,617
Change, Total net revenues	$ 17,924		$ 130,181
Change, Total net revenues, percent	12.00%		30.00%
Chegg Services
Disaggregation of Revenue [Line Items]
Total net revenues	$ 146,790	118,895	$ 482,654	345,258
Change, Total net revenues	$ 27,895		$ 137,396
Change, Total net revenues, percent	23.00%		40.00%
Required Materials
Disaggregation of Revenue [Line Items]
Total net revenues	$ 25,152	$ 35,123	$ 86,144	$ 93,359
Change, Total net revenues	$ (9,971)		$ (7,215)
Change, Total net revenues, percent	(28.00%)		(8.00%)

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