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Cover Page
May 06, 2021
Nov. 05, 2020
Cover [Abstract]    
Document Type 8-K  
Document Period End Date May 06, 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  
Document Information [Line Items]    
Document Period End Date May 06, 2021