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Cover Page - USD ($)
12 Months Ended
Dec. 31, 2020
Jan. 31, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 001-38678    
Entity Registrant Name UPWORK INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 46-4337682    
Entity Address, Address Line One 2625 Augustine Drive, Suite 601    
Entity Address, City or Town Santa Clara,    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95054    
City Area Code 650    
Local Phone Number 316-7500    
Title of 12(b) Security Common Stock, $0.0001 par value per share    
Trading Symbol UPWK    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Public Float     $ 1,532,720,862
Entity Common Stock, Shares Outstanding   124,962,279  
Entity Central Index Key 0001627475    
Current Fiscal Year End Date --12-31    
Documents Incorporated by Reference Portions of the registrant’s definitive proxy statement for its 2021 Annual Meeting of Stockholders, or Proxy Statement, to be filed within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, are incorporated by reference in Part III. Except with respect to information specifically incorporated by reference in this Annual Report, the Proxy Statement shall not be deemed to be filed as part hereof.