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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Feb. 24, 2020
Jun. 28, 2019
Cover page.      
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-38600    
Entity Registrant Name TENABLE HOLDINGS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 47-5580846    
Entity Address, Address Line One 7021 Columbia Gateway Drive, Suite 500    
Entity Address, City or Town Columbia    
Entity Address, State or Province MD    
Entity Address, Postal Zip Code 21046    
City Area Code 410    
Local Phone Number 872-0555    
Title of 12(b) Security Common stock, par value $0.01 per share    
Trading Symbol TENB    
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    
Entity Shell Company false    
Entity Public Float     $ 1.2
Entity Common Stock, Shares Outstanding (in shares)   99,404,819  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant's definitive Proxy Statement relating to the 2020 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K. The Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the year ended December 31, 2019.
    
Entity Central Index Key 0001660280    
Current Fiscal Year End Date --12-31    
Document Type 10-K    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false