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Note 4 - Fair Value Measurements | 12 Months Ended
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Dec. 31, 2024
Disclosure Text Block [Abstract] |
Fair Value Measurements | 4. Fair Value Measurements The Company’s financial instruments consist principally of cash and cash equivalents, restricted cash, other current receivables, accounts payable, accrued liabilities, insurance financing debt, liability-classified warrants and a contingent consideration obligation. The carrying amounts of financial instruments such as restricted cash, other current receivables, accounts payable, and accrued liabilities approximate their related fair values due to the short-term nature of these instruments. The carrying value of the Company’s insurance financing debt approximates its fair value as of December 31, 2024 and December 31, 2023 due to the market rate of interest, which is based on level 2 inputs. The Company’s liability-classified warrants and its contingent consideration obligation are carried at fair value based on level 3 inputs. None of the Company’s non-financial assets or liabilities are recorded at fair value on a nonrecurring basis. Cash and Cash Equivalents The Company invests its excess cash in money market funds that are classified as level 1 in the fair value hierarchy due to their short-term maturity, and measured the fair value based on quoted prices in active markets for identical assets. The fair value of the Company's cash and cash equivalents invested in money market funds was $9.8 million and $12.3 million as of December 31, 2024 and December 31, 2023, respectively. Contingent Consideration Obligation Pursuant to the Giiant License Agreement, the Company incurred a contingent consideration obligation related to future milestone payments. The Company has an obligation to make contingent consideration payments to Giiant, in either cash or shares of the Company’s common stock solely at the Company’s election, upon the achievement of development milestones. On August 2, 2024, the Company and Giiant entered into an amendment to the Giiant License Agreement, which among other things, reduced the milestone payments due to Giiant upon the achievement of certain development milestones (see Note 7, Collaborations and License Agreements, for further details). The fair value of the contingent consideration obligation is determined using a probability-based model that estimates the likelihood of success in achieving each of the defined milestones that is then discounted to present value using the Company's incremental borrowing rate. The fair value measurement is based on significant inputs not observable in the market and thus represents a Level 3 measurement as defined in fair value measurement accounting. The significant assumptions used in the calculation of the fair value as of December 31, 2024 included a discount rate of 9.29% and management's updated projections of the likelihood of success in achieving each of the defined milestones based on empirical, published industry data. The following table summarizes the activity of the Company’s Level 3 contingent consideration obligations, which are fair valued on a recurring basis (in thousands):
|  | Year Ended December 31, |
Contingent Consideration Obligation |  | 2024 |  |  | 2023 |
Fair value at beginning of year |  | $ | 204 |  |  | $ | — |
Initial fair value at the original issuance date |  |  | — |  |  |  | 212 |
Change in fair value during the year |  |  | (54 | ) |  |  | (8 | )
Fair value at end of year |  | $ | 150 |  |  | $ | 204 |
As of December 31, 2024, the entire amount of contingent consideration obligation of $150,000 was classified as a noncurrent liability in the consolidated balance sheet as none of it is expected to be settled within one-year of the balance sheet date. As of December 31, 2023, approximately $143,000 of the contingent consideration obligation was classified in accrued liabilities in the consolidated balance sheets as it was expected to be settled within one-year of the balance sheet date and the remaining obligation of approximately $61,000 was classified as a noncurrent liability in the consolidated balance sheet. The change in the fair value of the contingent consideration obligation of approximately $54,000 for the year ended December 31, 2024 was primarily due to the reduction in the milestone payments that would be due to Giiant upon the achievement of certain development milestones pursuant to the amendment to the Giiant License Agreement, partially offset by an increase in management's projected likelihood of success in achieving each of the defined milestones as a result of the Company's commencement of a Phase 1 trial in November of 2024. The change in the revaluation of the liability in the years ended December 31, 2024 and December 31, 2023 is recognized in research and development expenses in the consolidated statements of operations. In addition, the initial fair value of the contingent consideration obligation of $0.2 million and transaction-related costs of approxi mately $0.1 million for the year ended December 31, 2023 is recognized in research and development expenses in the consolidated statements of operations. Liability-Classified Warrants The Company has issued warrants that are accounted for as liabilities based upon the guidance of with ASC 480 and ASC 815. Estimating fair values of liability-classified financial instruments requires the development of estimates that may, and are likely to, change over the duration of the instrument with related changes in internal and external market factors. Changes in fair value of the liability-classified warrants are recognized as a component of other income, net in the consolidated statement of operations. As of December 31, 2024, the fair value of the Company's liability-classified warrants outstanding was determined using a Black-Scholes option pricing model valuation model to be insignificant due to the low market price of the Company's stock at the date of valuation relative to the exercise price of the underlying warrants outstanding. The following table summarizes the activity of the Company’s Level 3 liability-classified warrants during the years ended December 31, 2024 and December 31, 2023 (in thousands):
|  | Year Ended December 31, |
Warrant Liabilities |  | 2024 |  |  | 2023 |
Fair value at beginning of year |  | $ | 2 |  |  | $ | 61 |
Change in fair value during the period |  |  | — |  |  |  | (59 | )
Fair value at end of year |  | $ | 2 |  |  | $ | 2 |

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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/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 2: 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 3: 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 4: 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 5: 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 6: 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 7: 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 8: 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 9: 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 10: 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 11: 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 12: 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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