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Other Long-Term Debt | 3 Months Ended
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Mar. 31, 2026
Debt Disclosure [Abstract] |
Other Long-Term Debt | 7. Other Long-Term Debt Periphagen Note On December 9, 2019, the Company entered into a series of asset purchase agreements with Periphagen, Inc. (Periphagen), a biopharmaceutical company focused on the development of gene therapy vectors. Under the terms of the asset purchase agreements, the Company assumed a $1.0 million promissory note (the Periphagen Note) bearing a contractual interest rate of 2% compounded annually, with the outstanding balance and accrued interest due upon maturity in November 2027, with no interim installments due. The estimated market rate for the Company for an unsecured loan with a maturity in November 2027 was determined to be 15.83% as of December 9, 2019. Although the Company does not have a public credit rating, management estimates a CCC credit rating based on the Company’s financial position and stage of development. Using the commensurate rate for a CCC rated company and based on the amount due at maturity, the present value of the future cash outflow was determined to be $0.4 million at the transaction date. As of March 31, 2026, the carrying value of the note is $1.0 million. The carrying value of the note approximates fair value. Upon maturity, the Company will pay Periphagen $1.4 million for the outstanding balance and accrued interest due.

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