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Long-Lived Assets - Textbook Library (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |
Property and equipment, gross | $ 27,569 | $ 47,293 |
Less accumulated depreciation and amortization | (16,328) | (13,144) |
Textbook library, net | 11,241 | 34,149 |
Print textbook depreciation expense | 10,859 | 15,397 | $ 0
Loss (gain) on textbook library, net | $ 10,956 | $ (1,453) | $ 0

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- Definition Accumulated Depreciation, Depletion And Amortization, Textbook Library + References No definition available. + Details
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Namespace Prefix: | chgg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Depreciation, Textbook Library + References No definition available. + Details
Name: | chgg_DepreciationTextbookLibrary
Namespace Prefix: | chgg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Textbook Library, Gain (Loss), Net + References No definition available. + Details
Name: | chgg_TextbookLibraryGainLossNet
Namespace Prefix: | chgg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Textbook Library, Gross + References No definition available. + Details
Name: | chgg_TextbookLibraryGross
Namespace Prefix: | chgg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of amounts paid for textbooks which met the criteria for capitalization, net of related accumulated depreciation, which is expected to be used beyond one year. + References No definition available. + Details
Name: | chgg_TextbookLibraryNet
Namespace Prefix: | chgg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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