Nature of Operations and Summary of Significant Accounting Policies (Notes)	6 Months Ended
Jun. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Summary of Significant Accounting Policies [Text Block]	Nature of Operations and Significant Accounting Policies Description of Business and Basis of Presentation Trupanion, Inc. (collectively with its wholly-owned subsidiaries, the "Company") provides medical insurance for cats and dogs in the United States, Canada, and certain countries in Continental Europe. Through its data-driven, vertically-integrated approach, the Company develops and offers high-value medical insurance products, priced to take into account each pet's unique characteristics and coverage level. The financial data as of December 31, 2024 was derived from the Company's audited consolidated financial statements. The accompanying unaudited interim consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") and, in management's opinion, have been prepared on the same basis as the audited financial statements and include all adjustments, consisting of normal recurring adjustments, necessary for the fair presentation of the Company's financial position, results of operations, comprehensive income (loss), stockholders' equity and cash flows for the interim periods. These unaudited interim consolidated financial statements should be read in conjunction with the Company’s audited financial statements included in the Company’s Annual Report on Form 10-K, filed with the U.S. Securities and Exchange Commission ("SEC") on February 27, 2025 ("the 2024 10-K"). The Company's accounting policies are described in Note 1 to the audited financial statements included in the 2024 10-K and, for incremental accounting topics in the current period, are described below. Operating results for the six months ended June 30, 2025 are not necessarily indicative of the results that may be expected for the full fiscal year or any other interim period. Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from such estimates. See Note 1 to the audited financial statements included in the 2024 10-K for additional discussion of these estimates and assumptions. Acquisition of Intellectual Property The Company’s intellectual property acquisition was determined to be an asset acquisition in accordance with ASC 805-50, Business Combinations. To conclude if a transaction is an asset acquisition, the Company considers if substantially all of the fair value of the gross assets acquired are concentrated in a single identifiable asset or group of similar identifiable assets. The Company then considers if the acquired set of assets consist of inputs and processes that contribute to the creation of outputs. The acquired assets are recognized based on their cost to the Company, which includes related transaction costs. The Company allocates the purchase price based on relative fair value of the assets acquired. Refer to Note 4 for further discussion on the Company's acquisition of intellectual property. Nonmonetary Exchange The Company accounts for nonmonetary exchanges at fair value. If the transaction lacks commercial substance or fair value is not determinable, the asset received is recorded at the carrying amount of the asset surrendered. The Company evaluates each transaction individually to determine the appropriate accounting treatment. Accumulated Other Comprehensive Income Reclassifications The Company’s available-for-sale securities are reported at fair value with unrealized gains and losses included in accumulated other comprehensive income (loss). Upon realization, through sale or maturity, realized gains and losses are reclassified out of accumulated other comprehensive income. The Company has made a policy election to report the reclassification of accumulated other comprehensive income (loss), net from the beginning to the end of the period within our Statement of Comprehensive Income (Loss) and Note 11, Accumulated Comprehensive Income (Loss).

Trupanion, Inc. (collectively with its wholly-owned subsidiaries, the "Company") provides medical insurance for cats and dogs in the United States, Canada, and certain countries in Continental Europe. Through its data-driven, vertically-integrated approach, the Company develops and offers high-value medical insurance products, priced to take into account each pet's unique characteristics and coverage level.

The financial data as of December 31, 2024 was derived from the Company's audited consolidated financial statements. The accompanying unaudited interim consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") and, in management's opinion, have been prepared on the same basis as the audited financial statements and include all adjustments, consisting of normal recurring adjustments, necessary for the fair presentation of the Company's financial position, results of operations, comprehensive income (loss), stockholders' equity and cash flows for the interim periods. These unaudited interim consolidated financial statements should be read in conjunction with the Company’s audited financial statements included in the Company’s Annual Report on Form 10-K, filed with the U.S. Securities and Exchange Commission ("SEC") on February 27, 2025 ("the 2024 10-K"). The Company's accounting policies are described in Note 1 to the audited financial statements included in the 2024 10-K and, for incremental accounting topics in the current period, are described below. Operating results for the six months ended June 30, 2025 are not necessarily indicative of the results that may be expected for the full fiscal year or any other interim period.

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from such estimates. See Note 1 to the audited financial statements included in the 2024 10-K for additional discussion of these estimates and assumptions.

The Company’s intellectual property acquisition was determined to be an asset acquisition in accordance with ASC 805-50, Business Combinations. To conclude if a transaction is an asset acquisition, the Company considers if substantially all of the fair value of the gross assets acquired are concentrated in a single identifiable asset or group of similar identifiable assets. The Company then considers if the acquired set of assets consist of inputs and processes that contribute to the creation of outputs. The acquired assets are recognized based on their cost to the Company, which includes related transaction costs. The Company allocates the purchase price based on relative fair value of the assets acquired. Refer to Note 4 for further discussion on the Company's acquisition of intellectual property.

The Company accounts for nonmonetary exchanges at fair value. If the transaction lacks commercial substance or fair value is not determinable, the asset received is recorded at the carrying amount of the asset surrendered. The Company evaluates each transaction individually to determine the appropriate accounting treatment.

The Company’s available-for-sale securities are reported at fair value with unrealized gains and losses included in accumulated other comprehensive income (loss). Upon realization, through sale or maturity, realized gains and losses are reclassified out of accumulated other comprehensive income. The Company has made a policy election to report the reclassification of accumulated other comprehensive income (loss), net from the beginning to the end of the period within our Statement of Comprehensive Income (Loss) and Note 11, Accumulated Comprehensive Income (Loss).