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Significant Accounting Policies - Foreign Currency Translation and Remeasurement (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accounting Policies [Abstract] |  |  |
Net gains from remeasurement of foreign currency transactions | $ 3.7 | $ 0.0 | $ 0.0

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- Definition Foreign Currency Translation And Remeasurement Gain (Loss), Before Tax + References No definition available. + Details
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Namespace Prefix: | chgg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration