| Document and Entity Information | Sep. 16, 2020 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001639225 |
| Document Type | 8-K |
| Document Period End Date | Sep. 16, 2020 |
| Entity Registrant Name | Livongo Health, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38983 |
| Entity Tax Identification Number | 26-3542036 |
| Entity Address, Address Line One | 150 West Evelyn Avenue |
| Entity Address, Address Line Two | Suite 150 |
| Entity Address, City or Town | Mountain View |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94041 |
| City Area Code | (866) |
| Local Phone Number | 435-5643 |
| Written Communications | true |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock (par value $0.001 per share) |
| Trading Symbol | LVGO |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
