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Cover Page
Feb. 25, 2021
Feb. 24, 2021
Feb. 18, 2020
Cover [Abstract]      
Document Type 8-K    
Document Period End Date   Feb. 25, 2021  
Entity Registrant Name Groupon, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 27-0903295    
Entity Address, Address Line One 600 W Chicago Avenue    
Entity Address, Address Line Two Suite 400    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60654    
City Area Code (312)    
Local Phone Number 334-1579    
Entity File Number 1-35335    
Written Communications false    
Soliciting Material false    
Pre-commencement Tender Offer false    
Pre-commencement Issuer Tender Offer false    
Title of 12(b) Security Common stock, par value $0.0001 per share    
Trading Symbol GRPN    
Security Exchange Name NASDAQ    
Entity Emerging Growth Company false    
Entity Central Index Key     0001490281
Amendment Flag     false