v3.26.1
Cover - shares
 3 Months Ended
Mar. 31, 2026
Apr. 29, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-36720  
Entity Registrant Name UPLAND SOFTWARE, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 27-2992077  
Entity Address, Address Line One 900 S. Capital of Texas Highway, Las Cimas IV  
Entity Address, Address Line Two Suite 300  
Entity Address, City or Town Austin  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 78746  
City Area Code 512  
Local Phone Number 960-1010  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   29,363,201
Entity Central Index Key 0001505155  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Common Stock    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Trading Symbol UPLD  
Security Exchange Name NASDAQ  
Preferred Stock Purchase Rights    
Document Information [Line Items]    
Title of 12(b) Security Preferred Stock Purchase Rights  
No Trading Symbol Flag true  
Security Exchange Name NASDAQ