Commitments and Contingencies	9 Months Ended
Sep. 30, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 4. COMMITMENTS AND CONTINGENCIES Orion License and Supply Agreements On November 13, 2013, the Company acquired certain assets of Phyxius Pharma, Inc. (“Phyxius”) pursuant to an asset purchase agreement by and among the Company, Phyxius and the stockholders of Phyxius, dated October 21, 2013. Among these assets was a license with Orion Corporation (“Orion”) for the exclusive, sublicensable right to develop and commercialize pharmaceutical products containing levosimendan, 2.5 mg/ml concentrate for solution for infusion / 5ml vial in the United States and Canada (as amended from time to time, the “License”). On October 9, 2020 and January 25, 2022, the Company entered into amendments to the License to include in the scope of the License two new product formulations containing levosimendan, in capsule and solid dosage form (TNX-103) and a subcutaneously administered dosage form (TNX-102), subject to specified limitations (together, the “Product”). On February 19, 2024, the Company entered into an amendment to the License providing global rights to oral and subcutaneous formulations of levosimendan used in the treatment of pulmonary hypertension in heart failure with preserved ejection fraction (“PH-HFpEF”). The amendment also reduced the tiered royalties based on worldwide net sales of the product by the Company and its sublicensees, increased the License’s existing milestone payment due to Orion upon the grant of United States Food and Drug Administration (the “FDA”) approval of a levosimendan-based product to $10.0 million and added a milestone payment to Orion of $5.0 million due upon the grant of regulatory approval for a levosimendan-based product in Japan. The amendment also (i) increased the Company’s obligations to make certain non-refundable commercialization milestone payments to Orion, aggregating to up to $45.0 million, contingent upon achievement of certain cumulative worldwide sales of the product by the Company, and (ii) reduced the maximum price per capsule payable by the Company to Orion, under a supply agreement finalized in June 2026, for the commercial supply of oral levosimendan-based product. Pursuant to the License, the Company and Orion will agree to a new trademark when commercializing levosimendan in any of the dosage forms. On September 3, 2025, the Company entered into an amendment to the License providing exclusive worldwide rights to develop, commercialize, manufacture, and have manufactured any orally-administered pharmaceutical product containing levosimendan and, in addition to the Company’s existing rights to develop and commercialize subcutaneously administered products containing levosimendan, to manufacture or have manufactured such products. The License also grants the Company a right of first refusal to commercialize new developments of the Product, including developments as to the formulation, presentation, means of delivery, route of administration, dosage or indication but, pursuant to the February 2024 amendment, excluding new applications of levosimendan for neurological diseases and disorders developed by Orion. On June 29, 2026, the Company further amended the License and extended to December 31, 2035, the date by which regulatory approval for the Product must be obtained in the United States, in order to avoid the effectiveness of a termination right for either party based on the failure to achieve such milestone. Pursuant to the amendment, the Company also is required to comply with certain information and cybersecurity requirements of Orion. The term of the License extends until 10 years after the launch of the Product in the territory, provided that the License will continue after the end of the term in each country in the territory until the expiration of Orion’s patent rights in the Product in such country. As of September 30, 2026, the Company has not met any of the developmental milestones under the License and, accordingly, has not recorded any liability for the contingent payments due to Orion. On June 29, 2026, the Company and Orion also entered into a supply agreement to govern Orion's manufacture and supply of oral levosimendan for development and, if approved, commercial purposes (“Supply Agreement”). The Supply Agreement has an initial term of five years from the first delivery of supplied oral levosimendan with automatic three-year renewals unless either party provides 24 months' prior written notice of non-renewal. Either party may terminate the Supply Agreement for the other party's material breach, subject to a 60-day cure period, insolvency or in connection with a termination of the License. The Supply Agreement establishes forecasting, ordering, delivery, quality, pricing, and non-conforming product provisions and certain alternative manufacturing rights between Orion and the Company. The Supply Agreement also includes cost-sharing provisions with respect to scaling up Orion's manufacturing capabilities. Litigation The Company is subject to litigation in the normal course of business, none of which management believes will have a material adverse effect on the Company’s consolidated financial statements.

Commitments and Contingencies

9 Months Ended

Sep. 30, 2026

Commitments and Contingencies Disclosure [Abstract]

NOTE 4. COMMITMENTS AND CONTINGENCIES

Orion License and Supply Agreements

On November 13, 2013, the Company acquired certain assets of Phyxius Pharma, Inc. (“Phyxius”) pursuant to an asset purchase agreement by and among the Company, Phyxius and the stockholders of Phyxius, dated October 21, 2013. Among these assets was a license with Orion Corporation (“Orion”) for the exclusive, sublicensable right to develop and commercialize pharmaceutical products containing levosimendan, 2.5 mg/ml concentrate for solution for infusion / 5ml vial in the United States and Canada (as amended from time to time, the “License”). On October 9, 2020 and January 25, 2022, the Company entered into amendments to the License to include in the scope of the License two new product formulations containing levosimendan, in capsule and solid dosage form (TNX-103) and a subcutaneously administered dosage form (TNX-102), subject to specified limitations (together, the “Product”).

On February 19, 2024, the Company entered into an amendment to the License providing global rights to oral and subcutaneous formulations of levosimendan used in the treatment of pulmonary hypertension in heart failure with preserved ejection fraction (“PH-HFpEF”). The amendment also reduced the tiered royalties based on worldwide net sales of the product by the Company and its sublicensees, increased the License’s existing milestone payment due to Orion upon the grant of United States Food and Drug Administration (the “FDA”) approval of a levosimendan-based product to $10.0 million and added a milestone payment to Orion of $5.0 million due upon the grant of regulatory approval for a levosimendan-based product in Japan. The amendment also (i) increased the Company’s obligations to make certain non-refundable commercialization milestone payments to Orion, aggregating to up to $45.0 million, contingent upon achievement of certain cumulative worldwide sales of the product by the Company, and (ii) reduced the maximum price per capsule payable by the Company to Orion, under a supply agreement finalized in June 2026, for the commercial supply of oral levosimendan-based product. Pursuant to the License, the Company and Orion will agree to a new trademark when commercializing levosimendan in any of the dosage forms.

On September 3, 2025, the Company entered into an amendment to the License providing exclusive worldwide rights to develop, commercialize, manufacture, and have manufactured any orally-administered pharmaceutical product containing levosimendan and, in addition to the Company’s existing rights to develop and commercialize subcutaneously administered products containing levosimendan, to manufacture or have manufactured such products.

The License also grants the Company a right of first refusal to commercialize new developments of the Product, including developments as to the formulation, presentation, means of delivery, route of administration, dosage or indication but, pursuant to the February 2024 amendment, excluding new applications of levosimendan for neurological diseases and disorders developed by Orion.

On June 29, 2026, the Company further amended the License and extended to December 31, 2035, the date by which regulatory approval for the Product must be obtained in the United States, in order to avoid the effectiveness of a termination right for either party based on the failure to achieve such milestone. Pursuant to the amendment, the Company also is required to comply with certain information and cybersecurity requirements of Orion.

The term of the License extends until 10 years after the launch of the Product in the territory, provided that the License will continue after the end of the term in each country in the territory until the expiration of Orion’s patent rights in the Product in such country.

As of September 30, 2026, the Company has not met any of the developmental milestones under the License and, accordingly, has not recorded any liability for the contingent payments due to Orion.

On June 29, 2026, the Company and Orion also entered into a supply agreement to govern Orion's manufacture and supply of oral levosimendan for development and, if approved, commercial purposes (“Supply Agreement”). The Supply Agreement has an initial term of five years from the first delivery of supplied oral levosimendan with automatic three-year renewals unless either party provides 24 months' prior written notice of non-renewal. Either party may terminate the Supply Agreement for the other party's material breach, subject to a 60-day cure period, insolvency or in connection with a termination of the License. The Supply Agreement establishes forecasting, ordering, delivery, quality, pricing, and non-conforming product provisions and certain alternative manufacturing rights between Orion and the Company. The Supply Agreement also includes cost-sharing provisions with respect to scaling up Orion's manufacturing capabilities.

Litigation

The Company is subject to litigation in the normal course of business, none of which management believes will have a material adverse effect on the Company’s consolidated financial statements.