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Note 3 - Fair Value Measurements | 9 Months Ended
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Sep. 30, 2025
Notes to Financial Statements |
Fair Value Disclosures [Text Block] | NOTE 3. FAIR VALUE MEASUREMENTS The following tables present the Company’s financial instruments measured at fair value on a recurring basis as of September 30, 2025 and December 31, 2024 (in thousands):
|  |  |  |  |  | Fair Value Measurements Using |
|  |  |  |  |  | Quoted |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Prices in |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Active |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Markets |  |  | Significant |  |  |  |  |
|  |  |  |  |  | for |  |  | Other |  |  | Significant |
|  | Balance at |  |  | Identical |  |  | Observable |  |  | Unobservable |
|  | September 30, |  |  | Items |  |  | Inputs |  |  | Inputs |
|  | 2025 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash held as a deposit |  | $ | 393 |  |  | $ | 393 |  |  | $ | — |  |  | $ | — |
|  |  |  |  |  | Fair Value Measurements Using |
|  |  |  |  |  | Quoted |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Prices in |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Active |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Markets |  |  | Significant |  |  |  |  |
|  |  |  |  |  | for |  |  | Other |  |  | Significant |
|  | Balance at |  |  | Identical |  |  | Observable |  |  | Unobservable |
|  | December 31, |  |  | Items |  |  | Inputs |  |  | Inputs |
|  | 2024 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash held as a deposit |  | $ | 477 |  |  | $ | 477 |  |  | $ | — |  |  | $ | — |
The Company’s cash equivalents and restricted cash held as a deposit are classified within Level 1 of the fair value hierarchy because they are valued using quoted market prices in active markets, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency. Black Scholes Valuation Models and Assumptions The Company utilizes a Black Scholes model for various valuations as outlined throughout this report. The following tables summarize the assumptions utilized for valuations impacting results for the periods reported. See also Note 12, “Stock-Based Compensation” for related Black Scholes valuation assumptions. Warrant Liabilities Certain of the Company’s warrants were subject to stockholder approval upon issuance or amendment and prior to exercise. Warrants requiring stockholder approval are recorded as a liability at fair value upon issuance or amendment and continue to be recorded as a liability at fair value at each reporting date until stockholder approval occurs at which time they are transferred to stockholders’ equity at their fair value on the date of approval. Fair value was determined using a Black Scholes model as outlined below. See Note 10, “Common Stock Warrants” for additional information and the definitions of the Company’s warrants.
|  | December 2023 Warrants |  |  | December 2023 Warrants |
Measurement event |  | Reporting Date |  |  | Stockholder Approval |
Date |  | December 31, 2023 |  |  | May 28, 2024 |
Total Value (in millions) |  |  | 0.3 |  |  |  | 0.2 |
Gain (Loss) (in thousands) |  | not applicable |  |  |  | (51 | )
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 8.75 |  |  | $ | 8.75 |
Market price |  | $ | 7.14 |  |  | $ | 4.94 |
Volatility |  |  | 79.3 | % |  |  | 83.9 | %
Risk-free rate |  |  | 3.85 | % |  |  | 4.56 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (years) |  |  | 5.5 |  |  |  | 5.1 |
|  | March |  |  | March |
|  | 2024 |  |  | 2024 |
|  | Warrant |  |  | Warrant |
Measurement event |  | Issuance |  |  | Stockholder Approval |
Date |  | March 25, 2024 |  |  | May 28, 2024 |
Total Value (in millions) |  | $ | 0.1 |  |  | $ | 0.1 |
Gain (Loss) (in thousands) |  |  |  |  |  | $ | (28 | )
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 4.90 |  |  | $ | 4.90 |
Market price |  | $ | 4.55 |  |  | $ | 4.940 |
Volatility |  |  | 86.9 | % |  |  | 83.9 | %
Risk-free rate |  |  | 4.24 | % |  |  | 4.56 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (years) |  |  | 5.5 |  |  |  | 5.3 |
|  | September 2022, November 2022, & May 2023 Warrants |
Measurement event |  | Prior to amendment |  |  | After amendment |
Date |  | June 14, 2024 |  |  | June 14, 2024 |
Total Value (in thousands) |  | $ | 66 |  |  | $ | 100 |
Loss (in thousands) |  | not applicable |  |  | $ | 70 |
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 8.75 | - | 52.50 |  |  | $ | 2.50 |
Market price |  | $ | 2.51 |  |  | $ | 2.51 |
Volatility |  |  | 89.3 | % |  |  | 89.3 | %
Risk-free rate |  |  | 4.27% | - | 5.08% |  |  |  | 4.27% | - | 5.08% |
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (years) |  |  | 1.0 | - | 4.4 |  |  |  | 1.0 | - | 4.4 |
Preferred Stock Conversion Price Adjustments Terms of the Company’s outstanding Preferred Stock historically included a Ratchet whereby the applicable conversion price could be adjusted (see Note 11, “Stockholders’ Equity (Deficit)”). The applicable Ratchet provisions of the Company’s outstanding Preferred Stock terminated during the quarter ended March 31, 2024. Prior to its termination, when a conversion price for outstanding Preferred Stock was adjusted under the Ratchet, the Company recorded a deemed dividend as a reduction to income available to common stockholders. In accordance with ASC 820, the deemed dividend is measured as the difference between (1) the fair value of the Preferred Stock immediately prior to the conversion price adjustment (but without the Ratchet anti-dilution protection feature) and (2) the fair value of the Preferred Stock immediately after the conversion price adjustment (but without the Ratchet anti-dilution protection feature). Fair value was determined using a Black Scholes model as outlined below.
|  | Series C Preferred Stock |
Measurement event |  | Prior to Ratchet |  |  | After Ratchet |
Date |  | March 24, 2024 |  |  | March 24, 2024 |
Total value (a) (in millions) |  | $ | 0.5 |  |  | $ | 0.9 |
Deemed dividend (in millions) |  | not applicable |  |  | $ | 0.4 |
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 8.75 |  |  | $ | 4.90 |
Market price |  | $ | 4.77 |  |  | $ | 4.77 |
Volatility |  |  | 79.9 | % |  |  | 79.9 | %
Risk-free rate |  |  | 5.51 | % |  |  | 5.51 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (in years) |  |  | 0.1 |  |  |  | 0.1 |
| (a) | Includes value of incremental shares underlying preferred stock and adjusted for probability of occurrence.
Bifurcatable Derivatives Upon issuance in March 2024, the Unsecured Convertible Notes contained a lender’s conversion option which represented an embedded call option requiring bifurcation as an embedded derivative liability at fair value (see Note 9, “Convertible Notes” for additional discussion). Fair value was determined using a Black Scholes model as outlined below.
|  | Unsecured Convertible Notes derivative |  |  | Unsecured Convertible Notes derivative |
Measurement event |  | Issuance |  |  | Stockholder Approval |
Date |  | March 25, 2024 |  |  | May 28, 2024 |
Total value (in millions) |  | $ | 0.2 |  |  | $ | 0.2 |
Gain (Loss) (in thousands) |  | not applicable |  |  | $ | (82 | )
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 4.90 |  |  | $ | 4.90 |
Market price |  | $ | 4.51 |  |  | $ | 4.94 |
Volatility |  |  | 86.9 | % |  |  | 83.9 | %
Risk-free rate |  |  | 4.54 | % |  |  | 4.94 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (years) |  |  | 2.0 |  |  |  | 1.8 |

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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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