v3.10.0.1
Document and Entity Information - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Feb. 28, 2019
Oct. 03, 2018
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Trading Symbol UPWK    
Entity Registrant Name Upwork Inc.    
Entity Central Index Key 0001627475    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Common Stock, Shares Outstanding   106,692,030  
Entity Public Float     $ 900,000
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Well-known Seasoned Issuer No