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Note 3 - Fair Value Measurements | 12 Months Ended
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Dec. 31, 2024
Notes to Financial Statements |
Fair Value Disclosures [Text Block] | NOTE 3. FAIR VALUE MEASUREMENTS The following tables presents the Company’s financial instruments measured at fair value on a recurring basis as of December 31, 2024 and 2023 (in thousands):
|  |  |  |  |  | Fair Value Measurements Using |
|  |  |  |  |  | Quoted |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Prices in |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Active |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Markets |  |  | Significant |  |  |  |  |
|  |  |  |  |  | for |  |  | Other |  |  | Significant |
|  | Balance at |  |  | Identical |  |  | Observable |  |  | Unobservable |
|  | December |  |  | Items |  |  | Inputs |  |  | Inputs |
|  | 31, 2024 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash held as a certificate of deposit |  | $ | 477 |  |  | $ | 477 |  |  | $ | — |  |  | $ | — |
|  |  |  |  |  | Fair Value Measurements Using |
|  |  |  |  |  | Quoted |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Prices in |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Active |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Markets |  |  | Significant |  |  |  |  |
|  |  |  |  |  | for |  |  | Other |  |  | Significant |
|  | Balance at |  |  | Identical |  |  | Observable |  |  | Unobservable |
|  | December |  |  | Items |  |  | Inputs |  |  | Inputs |
|  | 31, 2023 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash held as a certificate of deposit |  | $ | 476 |  |  | $ | 476 |  |  | $ | — |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liability |  | $ | 334 |  |  | $ | — |  |  | $ | 334 |  |  | $ | — |
The Company’s cash equivalents and restricted cash held as certificates of 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. The Secured Convertible Notes and Unsecured Convertible Notes (see Note 13, “Convertible Notes”) are carried at proceeds, net of discounts, which management believes approximates fair value. As a result of certain call and put options within the Secured Convertible Notes and Unsecured Convertible Notes, the Company recorded an embedded derivative liability on its consolidated balance sheets with a corresponding debt discount which is netted against the face value of the Secured Convertible Notes and Unsecured Convertible Notes. The fair value of the embedded derivatives were calculated using the Black Scholes valuation model using Level 2 inputs of the fair value hierarchy. The fair value of the December 2023 Warrants issued in conjunction with the 2023 Warrant Reprice Transaction as well as the accounting for the warrant amendment and preferred stock conversion price adjustments that resulted from the 2023 Warrant Reprice Transaction were classified within Level 2. The fair value of the March 2024 Warrant issued in conjunction with the 2024 Subsidiary Guarantee Termination was classified within Level 2. See Note 14, “Common Stock Warrants and Warrant Liabilities,” subheading “Summary of Common Stock Warrant Liabilities,” for a reconciliation of the beginning and ending balances for the warrant liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2024 and 2023. Black Scholes Valuation Models and Assumptions The Company utilizes a Black Scholes model for various valuations as outlined throughout this annual report. The following tables summarize the assumptions utilized for valuations impacting results for the years ended December 31, 2024 and 2023. See also Note 16, “Equity-Based Compensation” for related Black Scholes valuation assumptions. Warrant Liabilities Various of the Company’s warrants have been 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 14, “Common Stock Warrants and Warrant Liabilities” for additional information and the definitions of the Company’s warrants.
| May 2023 Warrants |  | May 2023 Warrants |
Measurement event | Issuance |  | Stockholder Approval |
Date | May 1, 2023 |  | June 9, 2023 |
Total Value | $1.6 million |  | $1.4 million |
Gain (Loss) | not applicable |  | $0.2 million |
Assumptions: |  |  |  |  |  |
Exercise price | $ | 45.50 |  | $ | 45.50 |
Market price | $ | 25.20 | (a) | $ | 23.80 |
Volatility |  | 80.1 | % |  | 77.6 | %
Risk-free rate |  | 3.60 | - | 4.04 | % |  | 3.92 | - | 4.59 | %
Dividend yield |  | 0.0 | % |  | 0.0 | %
Term (years) |  | 2.1 | - | 5.1 |  |  | 2.0 | - | 5.0 |
|  | December 2023 Warrants |  |  | December 2023 Warrants |
Measurement event |  | Reporting Date |  |  | Stockholder Approval |
Date |  | December 31, 2023 |  |  | May 28, 2024 |
Total Value |  | $0.3 million |  |  | $0.2 million |
Gain (Loss) |  | $56 thousand |  |  | $(51 thousand) |
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 |  | Reporting Date |  |  | Stockholder Approval |
Date |  | March 31, 2024 |  |  | May 28, 2024 |
Total Value |  | $0.1 million |  |  | $0.1 million |
Gain (Loss) |  | $21 thousand |  |  | $(28 thousand) |
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 4.90 |  |  | $ | 4.90 |
Market price |  | $ | 3.66 |  |  | $ | 4.94 |
Volatility |  |  | 86.9 | % |  |  | 83.9 | %
Risk-free rate |  |  | 4.21 | % |  |  | 4.56 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (years) |  |  | 5.5 |  |  |  | 5.3 |
| (a) | Adjusted for the dilutive effect of the 2023 Private Placement. See additional discussion above.
Warrant Modifications Amendments to warrant terms are recorded as a non-cash gain (or loss) on modification of common stock warrants. The gain or loss represents the decrease or increase in the fair value of the amended warrants when comparing the value immediately before and after amendment using the Black Scholes option pricing model. Fair value was determined using a Black Scholes model as outlined below.
|  | July 2020, November 2021, September 2022 & November 2022 Warrants |
Measurement event |  | Prior to amendment |  |  | After amendment |
Date |  | April 27, 2023 |  |  | April 27, 2023 |
Total Value |  | $0.3 million |  |  | $0.5 million |
Loss |  | not applicable |  |  | $0.2 million |
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 220.50 |  |  | $ | 52.50 |
Market price |  | $ | 25.20 | (a) |  | $ | 25.20 | (a)
Volatility |  |  | 80.1 | % |  |  | 80.1 | %
Risk-free rate |  |  | 3.59 | - | 4.73 | % |  |  | 3.59 | - | 4.73 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (years) |  |  | 1.1 | - | 5.6 |  |  |  | 1.1 | - | 5.6 |
|  | May 2023 Warrants |
Measurement event |  | Prior to amendment |  |  | After amendment |
Date |  | December 21, 2023 |  |  | December 21, 2023 |
Total Value |  | $56 thousand |  |  | $0.2 million |
Loss |  | not applicable |  |  | $0.1 million |
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 45.50 |  |  | $ | 8.75 |
Market price |  | $ | 8.07 |  |  | $ | 8.07 |
Volatility |  |  | 79.3 | % |  |  | 79.3 | %
Risk-free rate |  |  | 3.92 | - | 4.62 | % |  |  | 3.92 | - | 4.62 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (years) |  |  | 1.5 | - | 4.5 |  |  |  | 1.5 | - | 4.5 |
|  | September 2022, November 2022, and May 2023 Warrants |
Measurement event |  | Prior to amendment |  |  | After amendment |
Date |  | June 14, 2024 |  |  | June 14, 2024 |
Total Value |  | $66 thousand |  |  | $0.1 million |
Loss |  | not applicable |  |  | $70 thousand |
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 | %
| (a) | Adjusted for the dilutive effect of the 2023 Private Placement. See additional discussion above.
Warrant Down Round Feature Adjustment Terms of the Company’s outstanding 2024 July Warrants included a down round feature adjustment whereby the applicable exercise price was automatically adjusted (see Note 11, “Financing Activities”). When the exercise price was adjusted, 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 2024 July Warrants immediately prior to the conversion price adjustment and (2) the fair value of the 2024 July Warrants immediately after the conversion price adjustment. Fair value was determined using a Black Scholes model, as outlined below.
|  | Series F-1 |
Measurement event |  | Prior to adjustment |  |  | After adjustment |
Date |  | September 27, 2024 |  |  | September 27, 2024 |
Total value |  | $1.7 million |  |  | $1.9 million |
Deemed dividend |  | not applicable |  |  | $0.2 million |
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 1.10 |  |  | $ | 0.66 |
Market price |  | $ | 0.71 |  |  | $ | 0.71 |
Volatility |  |  | 97.1 | % |  |  | 97.1 | %
Risk-free rate |  |  | 3.55 | % |  |  | 3.55 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (in years) |  |  | 4.84 |  |  |  | 4.84 |
|  | Series F-2 |
Measurement event |  | Prior to adjustment |  |  | After adjustment |
Date |  | September 27, 2024 |  |  | September 27, 2024 |
Total value |  | $0.2 million |  |  | $0.6 million |
Deemed dividend |  | not applicable |  |  | $0.4 million |
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 1.10 |  |  | $ | 0.66 |
Market price |  | $ | 0.71 |  |  | $ | 0.71 |
Volatility |  |  | 97.1 | % |  |  | 97.1 | %
Risk-free rate |  |  | 4.64 | % |  |  | 4.64 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (in years) |  |  | 0.34 |  |  |  | 0.34 |
|  | Series F-3 |
Measurement event |  | Prior to adjustment |  |  | After adjustment |
Date |  | September 27, 2024 |  |  | September 27, 2024 |
Total value |  | $0.6 million |  |  | $1.0 million |
Deemed dividend |  | not applicable |  |  | $0.4 million |
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 1.10 |  |  | $ | 0.66 |
Market price |  | $ | 0.71 |  |  | $ | 0.71 |
Volatility |  |  | 97.1 | % |  |  | 97.1 | %
Risk-free rate |  |  | 4.10 | % |  |  | 4.10 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (in years) |  |  | 0.84 |  |  |  | 0.84 |
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 15, “Stockholders’ Equity”). The applicable Ratchet provisions of the Company’s outstanding Preferred Stock terminated during the quarter ended March 31, 2024. When a conversion price 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 anti-dilution protection feature) and (2) the fair value of the Preferred Stock immediately after the conversion price adjustment (but without the anti-dilution protection feature). Fair value was determined using a Black Scholes model as outlined below.
|  | Series B & C Preferred Stock |
Measurement event |  | Prior to Ratchet |  |  | After Ratchet |
Date |  | April 27, 2023 |  |  | April 27, 2023 |
Total value (b) |  | $9.6 million |  |  | $11.6 million |
Deemed dividend |  | not applicable |  |  | $2.0 million |
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 220.50 |  |  | $ | 45.50 |
Market price |  | $ | 25.20 | (a) |  | $ | 25.20 | (a)
Volatility |  |  | 80.1 | % |  |  | 80.1 | %
Risk-free rate |  |  | 4.91 | % |  |  | 4.91 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (in years) |  |  | 0.8 |  |  |  | 0.8 |
|  | Series B & C Preferred Stock |
Measurement event |  | Prior to Ratchet |  |  | After Ratchet |
Date |  | December 21, 2023 |  |  | December 21, 2023 |
Total value (b) |  | $1.7 million |  |  | $6.8 million |
Deemed dividend |  | not applicable |  |  | $5.1 million |
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 45.50 |  |  | $ | 8.75 |
Market price |  | $ | 8.07 |  |  | $ | 8.07 |
Volatility |  |  | 79.3 | % |  |  | 79.3 | %
Risk-free rate |  |  | 5.43 | % |  |  | 5.43 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (years) |  |  | 0.3 |  |  |  | 0.3 |
|  | Series C Preferred Stock |
Measurement event |  | Prior to Ratchet |  |  | After Ratchet |
Date |  | March 24, 2024 |  |  | March 24, 2024 |
Total value (b) |  | $0.5 million |  |  | $0.9 million |
Deemed dividend |  | not applicable |  |  | $0.4 million |
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) | Adjusted for the dilutive effect of the 2023 Private Placement. See additional discussion above.
| (b) | 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 13, “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 |  |  | Shareholder Approval |
Date |  | March 25, 2024 |  |  | May 28, 2024 |
Total value |  | $0.2 million |  |  | $0.2 million |
Gain (Loss) |  | not applicable |  |  | $(82 thousand) |
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 |
Upon issuance in May 2023, the Secured 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 13, “Convertible Notes” for additional discussion). Fair value was determined using a Black Scholes model as outlined below.
|  | Secured Convertible Notes derivative |  |  | Secured Convertible Notes derivative |
Measurement event |  | Issuance |  |  | Shareholder Approval |
Date |  | April 27, 2023 |  |  | June 9, 2023 |
Total value (b) |  | $0.2 million |  |  | $0.2 million |
Gain |  | not applicable |  |  | $40 thousand |
Assumptions: |  |  |  |  |  |  |  |
Exercise price |  | $ | 45.50 |  |  | $ | 45.50 |
Market price |  |  | 25.20 | (a) |  | $ | 23.80 |
Volatility |  |  | 80.1 | % |  |  | 76.9 | %
Risk-free rate |  |  | 4.88 | % |  |  | 5.41 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Term (years) |  |  | 0.8 |  |  |  | 0.7 |
| (a) | Adjusted for the dilutive effect of the 2023 Private Placement. See additional discussion above.
| (b) | Adjusted for probability of occurrence.

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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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