Claims Reserve Cumulative claims paid and claims adjustment expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Subscription business [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 2,299,953
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	26,364
Subscription business [Member] \| Short-duration Insurance Contracts, Accident Year 2018 [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	437,682	$ 436,924	$ 436,489	$ 435,185
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	0
Subscription business [Member] \| Short-Duration Insurance Contract, Accident Year 2019
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	538,090	537,497	538,622
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	0
Subscription business [Member] \| Short-Duration Insurance Contract, Accident Year 2020
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	624,627	623,658
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	1,291
Subscription business [Member] \| Short-Duration Insurance Contract, Accident Year 2021
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	699,554
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	25,073
Other Operating Segment [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	1,152,797
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	29,557
Other Operating Segment [Member] \| Short-duration Insurance Contracts, Accident Year 2018 [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	211,959	211,777	212,156	$ 211,717
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	16
Other Operating Segment [Member] \| Short-Duration Insurance Contract, Accident Year 2019
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	285,798	286,253	$ 287,356
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	49
Other Operating Segment [Member] \| Short-Duration Insurance Contract, Accident Year 2020
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	320,461	$ 326,018
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	1,141
Other Operating Segment [Member] \| Short-Duration Insurance Contract, Accident Year 2021
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	334,579
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 28,351

TRUPANION, INC. 10-K