Cover Page Document - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 06, 2020	Jun. 30, 2019
Cover Page [Abstract]
Entity Central Index Key	0001371285
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Title of 12(b) Security	Common stock, $0.00001 par value per share
City Area Code	(855)
Entity Address, Address Line One	6100 4th Avenue S, Suite 200
Entity Incorporation, State or Country Code	DE
Entity File Number	001-36537
Entity Registrant Name	TRUPANION, INC.
Entity Tax Identification Number	83-0480694
Entity Address, City or Town	Seattle,
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98108
Local Phone Number	727 - 9079
Trading Symbol	TRUP
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Public Float			$ 1,174,944,132
Current Fiscal Year End Date	--12-31
Document Type	10-K
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		34,958,851