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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
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 3990 Freedom Circle    
Entity Address, City or Town Santa Clara    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95054    
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 No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 4,479,899,092
Entity Common Stock, Shares Outstanding   121,890,028  
Entity Central Index Key 0001364954    
Current Fiscal Year End Date --12-31    
Document Fiscal Year End 2019    
Document Fiscal Period Focus FY    
Amendment Flag false