Schedule 1-Parent Only Disclosures Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
Stock-based compensation expense		$ 38,312	$ 33,432	$ 33,161
Other, net		2,097	(1,748)	1,347
Net cash provided by operating activities		89,488	48,287	18,638
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Purchases of property, equipment, and internal-use software		(14,129)	(9,716)	(18,280)
Other		1,664	2,099	1,585
Net cash provided by (used in) investing activities		(95,887)	(13,457)	7,639
Dividends from subsidiaries		53,900	12,800	7,300
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
Proceeds from exercise of stock options		1,694	752	2,655
Shares withheld to satisfy tax withholding		(3,712)	(2,519)	(1,536)
Repayment of debt financing	$ (14,900)	(134,438)	(1,350)	(1,717)
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation		(22,862)	(3,957)	59,126
Net change in cash, cash equivalents, and restricted cash		(28,072)	28,996	85,827
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning Balance		199,530	170,464	84,637
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance		171,458	199,530	170,464
Parent Company
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Net loss		19,433	(9,633)	(44,693)
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
(Income) loss attributable to investments in subsidiaries		14,729	(8,707)	(39,184)
Depreciation and amortization		1,042	941	494
Stock-based compensation expense		8,109	6,178	4,575
Other, net		3,040	(395)	4,200
Changes in operating assets and liabilities		1,968	507	6,194
Net cash provided by operating activities		64,942	19,087	24,791
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Purchases of property, equipment, and internal-use software		(945)	(1,201)	(172)
Advances to and investments in subsidiaries		(39,687)	(13,526)	(87,198)
Other		1,546	2,157	1,586
Net cash provided by (used in) investing activities		(39,086)	(12,570)	(85,784)
Dividends from subsidiaries		53,862	12,782	14,837
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
Proceeds from exercise of stock options		1,694	752	2,655
Shares withheld to satisfy tax withholding		(3,712)	(2,519)	(1,536)
Proceeds from debt financing, net of financing fees		114,208	0	59,972
Repayment of debt financing		(134,438)	(1,350)	(1,225)
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation		(22,248)	(3,117)	59,866
Net change in cash, cash equivalents, and restricted cash		3,608	3,400	(1,127)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning Balance		37,357	33,957	35,084
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance		40,965	37,357	$ 33,957
Subsidiary Issuer
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
Stock-based compensation expense		$ 30,200	$ 27,300

TRUPANION, INC. 10-K