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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Mar. 22, 2017
Jun. 30, 2016
Document and Entity Information [Abstract]      
Entity Registrant Name Upland Software, Inc.    
Entity Central Index Key 0001505155    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding (in shares)   17,817,672  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float (in dollars)     $ 41.1