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Cover - USD ($)
 12 Months Ended
Dec. 31, 2024
Mar. 06, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-35335    
Entity Registrant Name Groupon, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 27-0903295    
Entity Address, Address Line One 35 West Wacker Drive    
Entity Address, Address Line Two 25th Floor    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60601    
City Area Code (773)    
Local Phone Number 945-6801    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol GRPN    
Security Exchange Name NASDAQ    
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    
Smaller Reporting Company false    
Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 376,952,000
Entity Common Stock, Shares Outstanding   39,810,936  
Documents Incorporated by Reference The information required by Part III of this Report, to the extent not set forth herein, is incorporated herein by reference from the registrant's definitive proxy statement relating to the Annual Meeting of Stockholders to be held in 2025 or, if not filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year to which this Report relates, from an amended report on Form 10-K/A filed in the same time period.    
Entity Central Index Key 0001490281    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY