Quarterly report [Sections 13 or 15(d)]

Note 6 - Stockholders' (Deficit) Equity and Equity-linked Instruments - Schedule of Preferred Stock (Details)

v3.25.3
Note 6 - Stockholders' (Deficit) Equity and Equity-linked Instruments - Schedule of Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Jul. 11, 2025
Jan. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Nov. 30, 2023
Aug. 23, 2023
Shares Purchased/ Issued in Exchange (in shares)   6,563   6,563    
Preferred Stock, Shares Outstanding (in shares)     1,882,907 17,499    
Gross Proceeds     $ 35,615,000      
Fees     4,420,000      
Net Proceeds     $ 31,195,000      
Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     46,000      
Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     3,452,933      
Conversions / Exchanges (in shares)     (1,570,026)      
Converted to Common stock (in shares)     1,570,026      
Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares)     (2,681,000)      
Original (in shares)     3,894,000      
Conversion of preferred stock to common stock (in shares) [3]     (1,213,000)      
Converted to Common stock (in shares)     2,681,000      
Series A Preferred Stock [Member]            
Conversion Prices (in dollars per share) [4],[5],[6],[7]     $ 496.4      
Preferred Stock, Shares Outstanding (in shares)     0      
Gross Proceeds     $ 5,359,000      
Fees     697,000      
Net Proceeds     $ 4,662,000      
Conversion Prices (in dollars per share) [4],[5],[6],[7]     $ 496.4      
Series A Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     2,000      
Series A Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     5,359      
Conversions / Exchanges (in shares)     (5,359)      
Converted to Common stock (in shares)     5,359      
Series A Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares)     0      
Original (in shares)     11,000      
Conversion of preferred stock to common stock (in shares) [3]     (11,000)      
Converted to Common stock (in shares)     0      
Series A-2 Preferred Stock [Member]            
Conversion Prices (in dollars per share) [4],[5],[6],[7]     $ 531.6      
Preferred Stock, Shares Outstanding (in shares)     0      
Gross Proceeds     $ 1,297,000      
Fees     169,000      
Net Proceeds     $ 1,128,000      
Conversion Prices (in dollars per share) [4],[5],[6],[7]     $ 531.6      
Series A-2 Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     0      
Series A-2 Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     1,297      
Conversions / Exchanges (in shares)     (1,297)      
Converted to Common stock (in shares)     1,297      
Series A-2 Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares)     0      
Original (in shares)     2,000      
Conversion of preferred stock to common stock (in shares) [3]     (2,000)      
Converted to Common stock (in shares)     0      
Series A-3 Preferred Stock [Member]            
Conversion Prices (in dollars per share) [4],[5],[6],[7]     $ 536.4      
Preferred Stock, Shares Outstanding (in shares)     0      
Gross Proceeds     $ 1,733,000      
Fees     225,000      
Net Proceeds     $ 1,508,000      
Conversion Prices (in dollars per share) [4],[5],[6],[7]     $ 536.4      
Series A-3 Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     0      
Series A-3 Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     1,733      
Conversions / Exchanges (in shares)     (1,733)      
Converted to Common stock (in shares)     1,733      
Series A-3 Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares)     0      
Original (in shares)     3,000      
Conversion of preferred stock to common stock (in shares) [3]     (3,000)      
Converted to Common stock (in shares)     0      
Series A-4 Preferred Stock [Member]            
Conversion Prices (in dollars per share) [4],[5],[6],[7]     $ 304      
Preferred Stock, Shares Outstanding (in shares)     0      
Gross Proceeds     $ 1,934,000      
Fees     251,000      
Net Proceeds     $ 1,683,000      
Conversion Prices (in dollars per share) [4],[5],[6],[7]     $ 304      
Series A-4 Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     1,000      
Series A-4 Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     1,934      
Conversions / Exchanges (in shares)     (1,934)      
Converted to Common stock (in shares)     1,934      
Series A-4 Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares)     0      
Original (in shares)     6,000      
Conversion of preferred stock to common stock (in shares) [3]     (6,000)      
Converted to Common stock (in shares)     0      
Series A-5 Preferred Stock [Member]            
Conversion Prices (in dollars per share) [4],[5],[6],[7]     $ 443.6      
Preferred Stock, Shares Outstanding (in shares)     0      
Gross Proceeds     $ 2,299,000      
Fees     299,000      
Net Proceeds     $ 2,000,000      
Conversion Prices (in dollars per share) [4],[5],[6],[7]     $ 443.6      
Series A-5 Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     1,000      
Series A-5 Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     2,299      
Conversions / Exchanges (in shares)     (2,299)      
Converted to Common stock (in shares)     2,299      
Series A-5 Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares)     0      
Original (in shares)     5,000      
Conversion of preferred stock to common stock (in shares) [3]     (5,000)      
Converted to Common stock (in shares)     0      
Series A A Preferred Stock [Member]            
Conversion Prices (in dollars per share)     $ 377.2      
Preferred Stock, Shares Outstanding (in shares)     153   7,322 10,706
Gross Proceeds     $ 7,680,000      
Fees     $ 966,000      
Price As Adjusted, Conversions (in dollars per share)     $ 75.6      
Conversion Prices (in dollars per share)     $ 377.2      
Series A A Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     3,000      
Series A A Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     7,680      
Conversions / Exchanges (in shares)     (7,527)      
Converted to Common stock (in shares)     7,527      
Series A A Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Net Proceeds     $ 6,714,000      
Original (in shares)     102,000      
Conversion of preferred stock to common stock (in shares) [3]     (100,000)      
Series A A Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Conversions / Exchanges (in shares)     (2,000)      
Converted to Common stock (in shares)     2,000      
Series AA-2 Convertible Preferred Stock [Member]            
Conversion Prices (in dollars per share)     $ 417.2      
Preferred Stock, Shares Outstanding (in shares)     0      
Gross Proceeds     $ 1,500,000      
Fees     $ 130,000      
Price As Adjusted, Conversions (in dollars per share)     $ 83.6      
Conversion Prices (in dollars per share)     $ 417.2      
Series AA-2 Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     1,500      
Conversions / Exchanges (in shares)     (1,500)      
Converted to Common stock (in shares)     1,500      
Series AA-2 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Net Proceeds     $ 1,370,000      
Original (in shares)     18,000      
Conversion of preferred stock to common stock (in shares) [3]     (18,000)      
Series AA-2 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Conversions / Exchanges (in shares)     0      
Converted to Common stock (in shares)     0      
Series AA-3 Convertible Preferred Stock [Member]            
Conversion Prices (in dollars per share)     $ 380      
Preferred Stock, Shares Outstanding (in shares)     0      
Gross Proceeds     $ 1,025,000      
Fees     $ 133,000      
Price As Adjusted, Conversions (in dollars per share)     $ 76      
Conversion Prices (in dollars per share)     $ 380      
Series AA-3 Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     1,025      
Conversions / Exchanges (in shares)     (1,025)      
Converted to Common stock (in shares)     1,025      
Series AA-3 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Net Proceeds     $ 892,000      
Original (in shares)     13,000      
Conversion of preferred stock to common stock (in shares) [3]     (13,000)      
Series AA-3 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Conversions / Exchanges (in shares)     0      
Converted to Common stock (in shares)     0      
Series AA-4 Convertible Preferred Stock [Member]            
Conversion Prices (in dollars per share)     $ 371.2      
Preferred Stock, Shares Outstanding (in shares)     0      
Gross Proceeds     $ 1,026,000      
Fees     $ 133,000      
Price As Adjusted, Conversions (in dollars per share)     $ 74.4      
Conversion Prices (in dollars per share)     $ 371.2      
Series AA-4 Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     1,026      
Conversions / Exchanges (in shares)     (1,026)      
Converted to Common stock (in shares)     1,026      
Series AA-4 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Net Proceeds     $ 893,000      
Original (in shares)     14,000      
Conversion of preferred stock to common stock (in shares) [3]     (14,000)      
Series AA-4 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Conversions / Exchanges (in shares)     0      
Converted to Common stock (in shares)     0      
Series AA-5 Convertible Preferred Stock [Member]            
Conversion Prices (in dollars per share)     $ 424      
Preferred Stock, Shares Outstanding (in shares)     0      
Gross Proceeds     $ 550,000      
Fees     $ 72,000      
Price As Adjusted, Conversions (in dollars per share)     $ 84.8      
Conversion Prices (in dollars per share)     $ 424      
Series AA-5 Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     550      
Conversions / Exchanges (in shares)     (550)      
Converted to Common stock (in shares)     550      
Series AA-5 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Net Proceeds     $ 478,000      
Original (in shares)     6,000      
Conversion of preferred stock to common stock (in shares) [3]     (6,000)      
Series AA-5 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Conversions / Exchanges (in shares)     0      
Converted to Common stock (in shares)     0      
Series AAA Convertible Preferred Stock [Member]            
Conversion Prices (in dollars per share)     $ 66.8      
Preferred Stock, Shares Outstanding (in shares)     115      
Gross Proceeds     $ 5,377,000      
Fees     645,000      
Net Proceeds     $ 4,732,000      
Price As Adjusted, Conversions (in dollars per share)     $ 20.08      
Conversion Prices (in dollars per share)     $ 66.8      
Series AAA Convertible Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     19,000      
Series AAA Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     9,388      
Conversions / Exchanges (in shares)     (9,273)      
Converted to Common stock (in shares)     9,273      
Series AAA Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares)     (5,000)      
Original (in shares)     467,000      
Conversion of preferred stock to common stock (in shares) [3]     (462,000)      
Converted to Common stock (in shares)     5,000      
Series AAA-2 Convertible Preferred Stock [Member]            
Conversion Prices (in dollars per share)     $ 68.4      
Preferred Stock, Shares Outstanding (in shares)     156      
Gross Proceeds     $ 2,978,000      
Fees     357,000      
Net Proceeds     $ 2,621,000      
Price As Adjusted, Conversions (in dollars per share)     $ 20.52      
Conversion Prices (in dollars per share)     $ 68.4      
Series AAA-2 Convertible Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     11,000      
Series AAA-2 Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     5,334      
Conversions / Exchanges (in shares)     (5,178)      
Converted to Common stock (in shares)     5,178      
Series AAA-2 Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares)     (8,000)      
Original (in shares)     81,000      
Conversion of preferred stock to common stock (in shares) [3]     (73,000)      
Converted to Common stock (in shares)     8,000      
Series AAA Junior Preferred Stock [Member]            
Conversion Prices (in dollars per share)     $ 50      
Preferred Stock, Shares Outstanding (in shares)     5      
Gross Proceeds     $ 1,210,000      
Fees     145,000      
Net Proceeds     $ 1,065,000      
Price As Adjusted, Conversions (in dollars per share)     $ 15      
Conversion Prices (in dollars per share)     $ 50      
Series AAA Junior Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     4,000      
Series AAA Junior Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     1,210      
Conversions / Exchanges (in shares)     (1,205)      
Converted to Common stock (in shares)     1,205      
Series AAA Junior Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares)     (1,000)      
Original (in shares)     81,000      
Conversion of preferred stock to common stock (in shares) [3]     (80,000)      
Converted to Common stock (in shares)     1,000      
Series AAA-2 Junior Convertible Preferred Stock [Member]            
Conversion Prices (in dollars per share)     $ 50      
Preferred Stock, Shares Outstanding (in shares)     10      
Gross Proceeds     $ 551,000      
Fees     66,000      
Net Proceeds     $ 485,000      
Price As Adjusted, Conversions (in dollars per share)     $ 15      
Conversion Prices (in dollars per share)     $ 50      
Series AAA-2 Junior Convertible Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     2,000      
Series AAA-2 Junior Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     551      
Conversions / Exchanges (in shares)     (541)      
Converted to Common stock (in shares)     541      
Series AAA-2 Junior Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares)     (1,000)      
Original (in shares)     37,000      
Conversion of preferred stock to common stock (in shares) [3]     (36,000)      
Converted to Common stock (in shares)     1,000      
Series AAA-3 Junior Preferred Stock [Member]            
Conversion Prices (in dollars per share)     $ 50      
Preferred Stock, Shares Outstanding (in shares)     0      
Gross Proceeds     $ 697,000      
Fees     84,000      
Net Proceeds     $ 613,000      
Price As Adjusted, Conversions (in dollars per share)     $ 15      
Conversion Prices (in dollars per share)     $ 50      
Series AAA-3 Junior Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     2,000      
Series AAA-3 Junior Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     697      
Conversions / Exchanges (in shares)     (697)      
Converted to Common stock (in shares)     697      
Series AAA-3 Junior Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares)     0      
Original (in shares)     46,000      
Conversion of preferred stock to common stock (in shares) [3]     (46,000)      
Converted to Common stock (in shares)     0      
Series AAA-4 Junior Preferred Stock [Member]            
Conversion Prices (in dollars per share)     $ 50      
Preferred Stock, Shares Outstanding (in shares)     0      
Gross Proceeds     $ 399,000      
Fees     48,000      
Net Proceeds     $ 351,000      
Price As Adjusted, Conversions (in dollars per share)     $ 15      
Conversion Prices (in dollars per share)     $ 50      
Series AAA-4 Junior Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1]     1,000      
Series AAA-4 Junior Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2]     399      
Conversions / Exchanges (in shares)     (399)      
Converted to Common stock (in shares)     399      
Series AAA-4 Junior Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares)     0      
Original (in shares)     27,000      
Conversion of preferred stock to common stock (in shares) [3]     (27,000)      
Converted to Common stock (in shares)     0      
Series AAAA Junior Convertible Preferred Stock [Member]            
Conversion Prices (in dollars per share) [4],[5],[6],[7],[8]     $ 4.91      
Shares Purchased/ Issued in Exchange (in shares) 3,775,047          
Preferred Stock, Shares Outstanding (in shares) [8]     1,866,481      
Gross Proceeds [8]     $ 0      
Fees [8]     0      
Net Proceeds [8]     $ 0      
Conversion Prices (in dollars per share) [4],[5],[6],[7],[8]     $ 4.91      
Series AAAA Junior Convertible Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1],[8]     0      
Series AAAA Junior Convertible Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2],[8]     3,394,964      
Conversions / Exchanges (in shares) [8]     (1,528,483)      
Converted to Common stock (in shares) [8]     1,528,483      
Series AAAA Junior Convertible Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares) [8]     (380,000)      
Original (in shares) [8]     691,000      
Conversion of preferred stock to common stock (in shares) [3],[8]     (311,000)      
Converted to Common stock (in shares) [8]     380,000      
Series B Preferred Stock [Member]            
Conversion Prices (in dollars per share) [4],[5],[6],[7],[9]     $ 7      
Preferred Stock, Shares Outstanding (in shares) [9]     15,987      
Gross Proceeds [9]     $ 0      
Fees [9]     0      
Net Proceeds [9]     $ 0      
Conversion Prices (in dollars per share) [4],[5],[6],[7],[9]     $ 7      
Series B Preferred Stock [Member] | Warrants Issued With Placement Agent Agreement [Member]            
Placement Agent Warrants (in shares) [1],[9]     0      
Series B Preferred Stock [Member] | Preferred Stock Converted to Preferred Stock [Member]            
Shares Purchased/ Issued in Exchange (in shares) [2],[9]     15,987      
Conversions / Exchanges (in shares) [9]     0      
Converted to Common stock (in shares) [9]     (0)      
Series B Preferred Stock [Member] | Preferred Stock Converted to Common Stock [Member]            
Conversions / Exchanges (in shares) [9]     (2,284,000)      
Original (in shares) [9]     2,284,000      
Conversion of preferred stock to common stock (in shares) [3],[9]     0      
Converted to Common stock (in shares) [9]     2,284,000      
[1] Pursuant to the terms of the Placement Agent Agreements, we agreed to issue to the Placement Agent, following the final closing under the individual Preferred Stock Offerings (effective as of the respective individual series closing dates), five-year warrants to purchase 14.5% of the shares of common stock issuable upon conversion of the respective series of Convertible Preferred Stock sold in the respective Preferred Stock Offering, at an exercise price equal to the applicable Preferred Stock Offering conversion price. See below for placement agent warrants exchanged in connection with the Exchange.
[2] Series AAA and Series AAA-2 totals include 4,011 and 2,356 preferred shares, respectively, issued in connection with the Series Exchange Agreements described below.
[3] As adjusted to reflect reduction in conversion prices as a result of the Series AA Down Round Feature, described below.
[4] In July 2025, the conversion prices for the AAA Preferred and the AAA Junior Preferred were adjusted pursuant to the applicable Down Round Feature. The conversion prices for AAA, AAA-2, AAA Junior, AAA Junior-2, AAA Junior-3 and AAA Junior-4 Preferred stock outstanding were adjusted to the conversion prices shown in the table above on the applicable date that the Down Round Feature was triggered (“July 2025 Down Round”). The July 2025 Down Round, resulted in a deemed dividend totaling $308,000, which was charged to accumulated deficit in the September 30, 2025 condensed balance sheet.
[5] The Conversion price for Series AA Preferred Stock outstanding as of August 23, 2023, totaling 10,706 shares of Series AA Preferred Stock, was adjusted to $104.00 as a result of the Series AA Down Round Feature described below.
[6] The Conversion prices for the Series AA Preferred Stock outstanding as of November 30, 2023, totaling 7,322 shares of Series AA Preferred Stock, were adjusted to the conversion prices shown in the table above, as a result of the Series AA Down Round Feature described below.
[7] The triggering of the Down Round Feature for the Series AA Preferred Stock, occurring in August 2023, resulted in a deemed dividend totaling $6,446,000, which was charged to retained earnings in the September 30, 2023 condensed balance sheet.
[8] Series AAAA Junior Preferred Stock was issued in exchange for certain debt outstanding, as described at Note 5.
[9] Series B Preferred Stock was issued in exchange for certain preferred stock outstanding, as described below.