COVER PAGE - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2019	Feb. 28, 2020	Jun. 30, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-38983
Entity Registrant Name	Livongo Health, Inc.
Entity Incorporation, State or Country Code	DE
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
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	LVGO
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding		96,032
Documents Incorporated by Reference	Documents Incorporated By Reference: Portions of the registrant's definitive Proxy Statement for its 2020 Annual Meeting of Stockholders, to be filed hereafter, are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Except for the portions of such proxy statement specifically incorporated by reference in this Annual Report on Form 10-K, such proxy statement shall not be deemed to be filed as part hereof.
Entity Central Index Key	0001639225
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY