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Significant Accounting Policies - Property Plant and Equipment (Details)	12 Months Ended
	Dec. 31, 2021
Content
Property, Plant and Equipment [Line Items]
Useful life	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Useful life	5 years
Internal-use software and website development
Property, Plant and Equipment [Line Items]
Useful life	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Useful life	5 years
Computers and equipment
Property, Plant and Equipment [Line Items]
Useful life	3 years
Textbook Library
Property, Plant and Equipment [Line Items]
Useful life	4 years

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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X

- Details

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Balance Type:
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X

- Details

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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=chgg_TextbookLibraryMember
Namespace Prefix:
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Balance Type:
Period Type: