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Financial Instruments and Fair Value Measurements | 6 Months Ended
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Jun. 30, 2026
Fair Value Disclosures [Abstract] |
Financial Instruments and Fair Value Measurements | 5. Financial Instruments and Fair Value Measurements Our assets that are required to be measured at fair value on a recurring basis consist of money market funds classified as cash and cash equivalents on our condensed consolidated balance sheets as of June 30, 2026 and December 31, 2025. Our liabilities that are required to be measured at fair value on a recurring basis consist of a derivative liability pursuant to a loan and security agreement (the “K2HV Loan Agreement”) with K2 HealthVentures LLC (“K2HV”) (see Note 7, Term Loan) on our condensed consolidated balance sheet as of December 31, 2025. We do not have any liabilities that are required to be measured at fair value on a recurring basis as of June 30, 2026. The carrying amounts reflected in the condensed consolidated balance sheets for cash, prepaid expenses and other current assets, accounts payable and accrued expenses approximate their fair values, due to their short-term nature. Assets measured at fair value on a recurring basis as of June 30, 2026 were as follows:
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
Assets: |  |  |  |  |  |  |
Money market funds | $ | 21,489 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,489 |
Total assets | $ | 21,489 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,489 |
Assets and liabilities measured at fair value on a recurring basis as of December 31, 2025 were as follows:
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
Assets: |  |  |  |  |  |  |
Money market funds | $ | 56,548 |  |  | $ | — |  |  | $ | — |  |  | $ | 56,548 |
Total assets | $ | 56,548 |  |  | $ | — |  |  | $ | — |  |  | $ | 56,548 |
Liabilities: |  |  |  |  |  |  |
Derivative liability | $ | — |  |  | $ | — |  |  | $ | 759 |  |  | $ | 759 |
Total liabilities | $ | — |  |  | $ | — |  |  | $ | 759 |  |  | $ | 759 |
There were no changes in valuation techniques used during the three or six months ended June 30, 2026. Derivative Liability In May 2024, we entered into the K2HV Loan Agreement, as further described in Note 7, which provided up to $60.0 million principal in term loans. Pursuant to the terms of the K2HV Loan Agreement, the lenders thereto could elect, prior to the full repayment of the term loans, to convert up to $5.0 million of the outstanding principal of the term loans into shares of our common stock at a conversion price of the lesser of $6.3182 per share (the “Fixed Price Conversion”) and the lowest effective price per share of our first equity financing following the closing of the K2HV Loan Agreement (the “Variable Price Conversion”), subject to customary adjustments and 9.99% and 19.99% beneficial ownership limitations. The Fixed Price Conversion and Variable Price Conversion within the K2HV Loan Agreement were required to be bifurcated as a single compound embedded derivative carried at fair value, with subsequent changes in fair value recognized in the condensed consolidated statements of operations. In May 2026, we repaid all amounts owed under K2HV Loan Agreement, as described in Note 7. Upon repayment of the outstanding principal of the term loan, the lenders’ ability to exercise the conversion option expired. The following table reconciles the change in fair value of the derivative liability based on Level 3 inputs:
| Six Months Ended June 30,
| 2026 |  | 2025
| (in thousands)
Balance at beginning of period | $ | 759 |  |  | $ | 2,829 |
Change in fair value | (707) |  |  | (190) |
Extinguishment of note payable | (52) |  |  | — |
Balance at end of period | $ | — |  |  | $ | 2,639 |
The change in fair value of the derivative liability is included in other income, net in the accompanying condensed consolidated statements of operations. We recognized nominal gains related to change in fair value of the derivative liability during the three months ended June 30, 2026 and 2025. We recognized gains of $0.7 million and $0.2 million related to change in fair value of the derivative liability during the six months ended June 30, 2026 and 2025, respectively. The fair value of the derivative liability immediately prior to repayment of the amounts owed under K2HV Loan Agreement was written off and is included in the loss on extinguishment of note payable in the accompanying condensed consolidated statement of operations in the amount of $0.1 million for the three and six months ended June 30, 2026. The fair value of the derivative liability in the term loan was estimated using the Monte Carlo and the Black-Scholes models, each weighted based on the probable outcomes of various scenarios. A summary of the weighted-average significant unobservable inputs (Level 3 inputs) used in measuring the derivative liability in the term loan as of December 31, 2025 is as follows:
Stock price |  |  | $0.63
Volatility |  |  | 105.0%
Risk-free rate (continuous) |  |  | 3.5%
Expected term (in years) |  |  | 0.25
Dividend yield (continuous) |  |  | —%

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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