| Cover Page Document | Feb. 10, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 10, 2021 |
| Entity Registrant Name | TENABLE HOLDINGS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-38600 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | TENB |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001660280 |
| Amendment Flag | false |
| Entity Tax Identification Number | 47-5580846 |
