Cover Page Document - shares	9 Months Ended
	Sep. 30, 2023	Oct. 27, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-36537
Entity Registrant Name	TRUPANION, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	83-0480694
Entity Address, Address Line One	6100 4th Avenue S, Suite 200
Entity Address, City or Town	Seattle,
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98108
City Area Code	(855)
Local Phone Number	727 - 9079
Title of 12(b) Security	Common stock, $0.00001 par value per share
Trading Symbol	TRUP
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		41,545,178
Entity Central Index Key	0001371285
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false