| Cover Page - shares | 9 Months Ended | |
| Sep. 30, 2022 | Oct. 26, 2022 | |
| Cover [Abstract] | ||
| Document Type | 10-Q/A | |
| Document Quarterly Report | true | |
| Document Period End Date | Sep. 30, 2022 | |
| 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 | 6100 Merriweather Drive | |
| Entity Address, City or Town | Columbia | |
| Entity Address, State or Province | MD | |
| Entity Address, Postal Zip Code | 21044 | |
| 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 Current Reporting Status | Yes | |
| Entity Interactive Data Current | Yes | |
| Entity Filer Category | Large Accelerated Filer | |
| Entity Emerging Growth Company | false | |
| Entity Small Business | false | |
| Entity Shell Company | false | |
| Entity Common Stock, Shares Outstanding | 112,514,101 | |
| Current Fiscal Year End Date | --12-31 | |
| Document Fiscal Year Focus | 2022 | |
| Document Fiscal Period Focus (i.e. Q1,Q2,Q3,FY) | Q3 | |
| Amendment Flag | true | |
| Amendment Description | The purpose of this amendment (Amendment) to our Form 10-Q for the quarter ended September 30, 2022 (Form 10-Q) as filed with the Securities and Exchange Commission (SEC) on October 31, 2022 is solely to correct the number of new enterprise platform customers added in the three months ended September 30, 2022 and the corresponding percentage change year-over-year, which were reported incorrectly due to a clerical error. The amended number of new enterprise platform customers is 508 compared to 712 previously reported. The amended disclosure can be found under the Customer Metrics heading in the Key Operating and Financial Metrics section of Item 2 on page 6 below. The remainder of our Form 10-Q, including Item 2 below, is unchanged. Our financial results for the three and nine months ended September 30, 2022 and our financial outlook for three months and year ending December 31, 2022 were not impacted by this Amendment.This Amendment is as of the original filing date of our Form 10-Q, October 31, 2022. The Amendment does not reflect events or transactions that may have occurred after the original filing date or modify or update any disclosures in our Form 10-Q that may have been affected by subsequent events or transactions. Accordingly, this Amendment should be read in conjunction with our Form 10-Q and our other filings with the SEC. | |
| Entity Central Index Key | 0001660280 |
