v3.25.4
Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2025
Feb. 28, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-36180    
Entity Registrant Name CHEGG, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-3237489    
Entity Address, Address Line One 2261 Market Street STE 46218    
Entity Address, City or Town San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94114    
City Area Code 408    
Local Phone Number 855-5700    
Title of 12(b) Security Common Stock, $0.001 par value per share    
Trading Symbol CHGG    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 126,089,139
Entity Common Stock, Shares Outstanding   111,798,694  
Documents Incorporated by Reference
Portions of the Registrant's definitive proxy statement for the Registrant's 2026 Annual Meeting of Stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. The Proxy Statement will be filed within 120 days of the Registrant's fiscal year ended December 31, 2025.
    
Entity Central Index Key 0001364954    
Document Fiscal Year End 2025    
Document Fiscal Period Focus FY    
Amendment Flag false