Annual report pursuant to Section 13 and 15(d)

Note 7 - Stockholders" Equity and Equity-linked Instruments - Schedule of Stock by Class (Details)

v3.24.1.u1
Note 7 - Stockholders" Equity and Equity-linked Instruments - Schedule of Stock by Class (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Nov. 30, 2023
Aug. 23, 2023
Preferred Stock, Shares Issued (in shares) 23,656 10,323    
Issued (in shares) 23,656 10,323    
Preferred Stock, Shares Outstanding (in shares) 23,656 10,323    
Net Proceeds $ 19,295,000 $ 8,926,000    
Outstanding (in shares) 23,656 10,323    
Series AAA Convertible Preferred Stock [Member]        
Conversion Price – At Issuance (in dollars per share) $ 1.674      
Original Conversion Price – At Issuance(2) (in dollars per share) 1.674      
Price As Adjusted, Conversions (in dollars per share) $ 1.674      
Stock Issued During Period, Shares, New Issues (in shares) 5,377      
Preferred Stock, Shares Issued (in shares) 5,377      
Gross Proceeds $ 5,377,000      
Issued (in shares) 5,377      
Converted (in shares) 0      
Fees $ 645,000      
Converted (in shares) 0      
Preferred Stock, Shares Outstanding (in shares) 5,377      
Net Proceeds $ 4,732,000      
Outstanding (in shares) 5,377      
Original Conversion Shares (in shares) 3,212,000      
Conversion Shares – At Issuance (in shares) 3,212,000      
Original Conversion Shares (in shares) 3,212,000      
Conversion of stock, amount converted $ 0      
Conversion Shares (in shares) 3,212,000      
Placement Agent Warrants (1) (in shares) [1] 466,000      
Placement Agent Warrants (1) (in shares) [1] 466,000      
Conversion of Stock, Shares Converted 0      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 3,212,000      
Adjusted Conversion Price(1) (in shares) 0      
Conversion Shares At End of Period (in shares) 3,212,000      
Series A A Preferred Stock [Member]        
Conversion Price – At Issuance (in dollars per share) [2] $ 9.43      
Original Conversion Price – At Issuance(2) (in dollars per share) [2] 9.43      
Preferred Stock, Convertible, Conversion Price $ 9.43     $ 2.6
Stock Issued During Period, Shares, New Issues (in shares) 7,680      
Gross Proceeds $ 7,680,000      
Fees 966,000      
Preferred Stock, Shares Outstanding (in shares)     7,322 10,706
Net Proceeds $ 6,714,000      
Outstanding (in shares)     7,322 10,706
Conversion Shares – At Issuance (in shares) 814,000      
Conversion Shares (in shares) 814,000      
Placement Agent Warrants (1) (in shares) [3] 114,000      
Placement Agent Warrants (1) (in shares) [3] 114,000      
Series AA Convertible Preferred Stock [Member]        
Price As Adjusted, Conversions (in dollars per share) $ 1.89      
Preferred Stock, Shares Issued (in shares) 7,680      
Issued (in shares) 7,680      
Converted (in shares) (2,926)      
Converted (in shares) 2,926      
Preferred Stock, Shares Outstanding (in shares) 4,754      
Outstanding (in shares) 4,754      
Original Conversion Shares (in shares) 814,000      
Original Conversion Shares (in shares) 814,000      
Conversion of stock, amount converted $ (1,336,000)      
Conversion of Stock, Shares Converted [4] 3,043,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 2,521,000      
Adjusted Conversion Price(1) (in shares) [4] 3,043,000      
Conversion Shares At End of Period (in shares) 2,521,000      
Series A Preferred Stock [Member]        
Conversion Price – At Issuance (in dollars per share) $ 12.4      
Original Conversion Price – At Issuance(2) (in dollars per share) 12.4      
Preferred Stock, Convertible, Conversion Price $ 12.4      
Stock Issued During Period, Shares, New Issues (in shares) 5,359      
Preferred Stock, Shares Issued (in shares) 5,359      
Gross Proceeds $ 5,359,000      
Issued (in shares) 5,359      
Converted (in shares) (4,551)      
Fees $ 752,000      
Converted (in shares) 4,551      
Preferred Stock, Shares Outstanding (in shares) 808      
Net Proceeds $ 4,607,000      
Outstanding (in shares) 808      
Original Conversion Shares (in shares) 432,000      
Conversion Shares – At Issuance (in shares) 432,000      
Original Conversion Shares (in shares) 432,000      
Conversion of stock, amount converted $ (367,000)      
Conversion Shares (in shares) 432,000      
Placement Agent Warrants (1) (in shares) [5] 62,000      
Placement Agent Warrants (1) (in shares) [5] 62,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 65,000      
Conversion Shares At End of Period (in shares) 65,000      
Series AA-2 Convertible Preferred Stock [Member]        
Conversion Price – At Issuance (in dollars per share) [2] $ 10.43      
Original Conversion Price – At Issuance(2) (in dollars per share) [2] 10.43      
Price As Adjusted, Conversions (in dollars per share) $ 2.09      
Preferred Stock, Convertible, Conversion Price       $ 10.43
Stock Issued During Period, Shares, New Issues (in shares) 1,500      
Preferred Stock, Shares Issued (in shares) 1,500      
Gross Proceeds $ 1,500,000      
Issued (in shares) 1,500      
Converted (in shares) (1,500)      
Fees $ 130,000      
Converted (in shares) 1,500      
Preferred Stock, Shares Outstanding (in shares) 0      
Net Proceeds $ 1,370,000      
Outstanding (in shares) 0      
Original Conversion Shares (in shares) 144,000      
Conversion Shares – At Issuance (in shares) 144,000      
Original Conversion Shares (in shares) 144,000      
Conversion of stock, amount converted $ (274,000)      
Conversion Shares (in shares) 144,000      
Placement Agent Warrants (1) (in shares) [3] 13,000      
Placement Agent Warrants (1) (in shares) [3] 13,000      
Conversion of Stock, Shares Converted [4] 130,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 0      
Adjusted Conversion Price(1) (in shares) [4] 130,000      
Conversion Shares At End of Period (in shares) 0      
Series A-2 Preferred Stock [Member]        
Conversion Price – At Issuance (in dollars per share) $ 13.29      
Original Conversion Price – At Issuance(2) (in dollars per share) 13.29      
Preferred Stock, Convertible, Conversion Price $ 13.29      
Stock Issued During Period, Shares, New Issues (in shares) 1,297      
Preferred Stock, Shares Issued (in shares) 1,297      
Gross Proceeds $ 1,297,000      
Issued (in shares) 1,297      
Converted (in shares) (834)      
Fees $ 169,000      
Converted (in shares) 834      
Preferred Stock, Shares Outstanding (in shares) 463      
Net Proceeds $ 1,128,000      
Outstanding (in shares) 463      
Original Conversion Shares (in shares) 98,000      
Conversion Shares – At Issuance (in shares) 98,000      
Original Conversion Shares (in shares) 98,000      
Conversion of stock, amount converted $ (63,000)      
Conversion Shares (in shares) 98,000      
Placement Agent Warrants (1) (in shares) [5] 14,000      
Placement Agent Warrants (1) (in shares) [5] 14,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 35,000      
Conversion Shares At End of Period (in shares) 35,000      
Series AAA-2 Convertible Preferred Stock [Member]        
Conversion Price – At Issuance (in dollars per share) $ 1.71      
Original Conversion Price – At Issuance(2) (in dollars per share) 1.71      
Price As Adjusted, Conversions (in dollars per share) $ 1.71      
Stock Issued During Period, Shares, New Issues (in shares) 2,978      
Preferred Stock, Shares Issued (in shares) 2,978      
Gross Proceeds $ 2,978,000      
Issued (in shares) 2,978      
Converted (in shares) 0      
Fees $ 357,000      
Converted (in shares) (0)      
Preferred Stock, Shares Outstanding (in shares) 2,978      
Net Proceeds $ 2,621,000      
Outstanding (in shares) 2,978      
Original Conversion Shares (in shares) 1,742,000      
Conversion Shares – At Issuance (in shares) 1,742,000      
Original Conversion Shares (in shares) 1,742,000      
Conversion of stock, amount converted $ 0      
Conversion Shares (in shares) 1,742,000      
Placement Agent Warrants (1) (in shares) [1] 253,000      
Placement Agent Warrants (1) (in shares) [1] 253,000      
Conversion of Stock, Shares Converted 0      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 1,742,000      
Adjusted Conversion Price(1) (in shares) 0      
Conversion Shares At End of Period (in shares) 1,742,000      
Series AA-3 Convertible Preferred Stock [Member]        
Conversion Price – At Issuance (in dollars per share) [2] $ 9.5      
Original Conversion Price – At Issuance(2) (in dollars per share) [2] 9.5      
Price As Adjusted, Conversions (in dollars per share) $ 1.9      
Preferred Stock, Convertible, Conversion Price       9.5
Stock Issued During Period, Shares, New Issues (in shares) 1,025      
Preferred Stock, Shares Issued (in shares) 1,025      
Gross Proceeds $ 1,025,000      
Issued (in shares) 1,025      
Converted (in shares) (634)      
Fees $ 133,000      
Converted (in shares) 634      
Preferred Stock, Shares Outstanding (in shares) 391      
Net Proceeds $ 892,000      
Outstanding (in shares) 391      
Original Conversion Shares (in shares) 108,000      
Conversion Shares – At Issuance (in shares) 108,000      
Original Conversion Shares (in shares) 108,000      
Conversion of stock, amount converted $ (334,000)      
Conversion Shares (in shares) 108,000      
Placement Agent Warrants (1) (in shares) [3] 15,000      
Placement Agent Warrants (1) (in shares) [3] 15,000      
Conversion of Stock, Shares Converted [4] 432,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 206,000      
Adjusted Conversion Price(1) (in shares) [4] 432,000      
Conversion Shares At End of Period (in shares) 206,000      
Series A-3 Preferred Stock [Member]        
Conversion Price – At Issuance (in dollars per share) $ 13.41      
Original Conversion Price – At Issuance(2) (in dollars per share) 13.41      
Preferred Stock, Convertible, Conversion Price $ 13.41      
Stock Issued During Period, Shares, New Issues (in shares) 1,733      
Preferred Stock, Shares Issued (in shares) 1,733      
Gross Proceeds $ 1,733,000      
Issued (in shares) 1,733      
Converted (in shares) (1,418)      
Fees $ 225,000      
Converted (in shares) 1,418      
Preferred Stock, Shares Outstanding (in shares) 315      
Net Proceeds $ 1,508,000      
Outstanding (in shares) 315      
Original Conversion Shares (in shares) 129,000      
Conversion Shares – At Issuance (in shares) 129,000      
Original Conversion Shares (in shares) 129,000      
Conversion of stock, amount converted $ (106,000)      
Conversion Shares (in shares) 129,000      
Placement Agent Warrants (1) (in shares) [5] 18,000      
Placement Agent Warrants (1) (in shares) [5] 18,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 23,000      
Conversion Shares At End of Period (in shares) 23,000      
Series AAA and AAA-2 Convertible Preferred Stock [Member]        
Stock Issued During Period, Shares, New Issues (in shares) 8,355      
Preferred Stock, Shares Issued (in shares) 8,355      
Gross Proceeds $ 8,355,000      
Issued (in shares) 8,355      
Converted (in shares) 0      
Fees $ 1,002,000      
Converted (in shares) (0)      
Preferred Stock, Shares Outstanding (in shares) 8,355      
Net Proceeds $ 7,353,000      
Outstanding (in shares) 8,355      
Original Conversion Shares (in shares) 4,954,000      
Conversion Shares – At Issuance (in shares) 4,954,000      
Original Conversion Shares (in shares) 4,954,000      
Conversion Shares (in shares) 4,954,000      
Placement Agent Warrants (1) (in shares) [1] 719,000      
Placement Agent Warrants (1) (in shares) [1] 719,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 4,954,000      
Conversion Shares At End of Period (in shares) 4,954,000      
Series AA-4 Convertible Preferred Stock [Member]        
Conversion Price – At Issuance (in dollars per share) [2] $ 9.28      
Original Conversion Price – At Issuance(2) (in dollars per share) [2] 9.28      
Price As Adjusted, Conversions (in dollars per share) $ 1.86      
Preferred Stock, Convertible, Conversion Price       9.28
Stock Issued During Period, Shares, New Issues (in shares) 1,026      
Preferred Stock, Shares Issued (in shares) 1,026      
Gross Proceeds $ 1,026,000      
Issued (in shares) 1,026      
Converted (in shares) (511)      
Fees $ 133,000      
Converted (in shares) 511      
Preferred Stock, Shares Outstanding (in shares) 515      
Net Proceeds $ 893,000      
Outstanding (in shares) 515      
Original Conversion Shares (in shares) 109,000      
Conversion Shares – At Issuance (in shares) 111,000      
Original Conversion Shares (in shares) 109,000      
Conversion of stock, amount converted $ (275,000)      
Conversion Shares (in shares) 111,000      
Placement Agent Warrants (1) (in shares) [3] 16,000      
Placement Agent Warrants (1) (in shares) [3] 16,000      
Conversion of Stock, Shares Converted [4] 443,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 277,000      
Adjusted Conversion Price(1) (in shares) [4] 443,000      
Conversion Shares At End of Period (in shares) 277,000      
Series A-4 Preferred Stock [Member]        
Conversion Price – At Issuance (in dollars per share) $ 7.6      
Original Conversion Price – At Issuance(2) (in dollars per share) 7.6      
Preferred Stock, Convertible, Conversion Price $ 7.6      
Stock Issued During Period, Shares, New Issues (in shares) 1,934      
Preferred Stock, Shares Issued (in shares) 1,934      
Gross Proceeds $ 1,934,000      
Issued (in shares) 1,934      
Converted (in shares) (1,383)      
Fees $ 251,000      
Converted (in shares) 1,383      
Preferred Stock, Shares Outstanding (in shares) 551      
Net Proceeds $ 1,683,000      
Outstanding (in shares) 551      
Original Conversion Shares (in shares) 254,000      
Conversion Shares – At Issuance (in shares) 254,000      
Original Conversion Shares (in shares) 254,000      
Conversion of stock, amount converted $ (182,000)      
Conversion Shares (in shares) 254,000      
Placement Agent Warrants (1) (in shares) [5] 36,000      
Placement Agent Warrants (1) (in shares) [5] 36,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 72,000      
Conversion Shares At End of Period (in shares) 72,000      
Series AAA Preferred Stock Exchanges [Member]        
Price As Adjusted, Conversions (in dollars per share) $ 1.674      
Preferred Stock, Shares Issued (in shares) 4,011      
Issued (in shares) 4,011      
Converted (in shares) (125)      
Converted (in shares) 125      
Preferred Stock, Shares Outstanding (in shares) 3,886      
Outstanding (in shares) 3,886      
Original Conversion Shares (in shares) 2,396,000      
Original Conversion Shares (in shares) 2,396,000      
Conversion of stock, amount converted $ (75,000)      
Conversion of Stock, Shares Converted 0      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 2,321,000      
Adjusted Conversion Price(1) (in shares) 0      
Conversion Shares At End of Period (in shares) 2,321,000      
Series AA-5 Convertible Preferred Stock [Member]        
Conversion Price – At Issuance (in dollars per share) [2] $ 10.6      
Original Conversion Price – At Issuance(2) (in dollars per share) [2] 10.6      
Price As Adjusted, Conversions (in dollars per share) $ 2.12      
Preferred Stock, Convertible, Conversion Price       $ 10.6
Stock Issued During Period, Shares, New Issues (in shares) 550      
Preferred Stock, Shares Issued (in shares) 550      
Gross Proceeds $ 550,000      
Issued (in shares) 550      
Converted (in shares) 0      
Fees $ 72,000      
Converted (in shares) (0)      
Preferred Stock, Shares Outstanding (in shares) 550      
Net Proceeds $ 478,000      
Outstanding (in shares) 550      
Original Conversion Shares (in shares) 58,000      
Conversion Shares – At Issuance (in shares) 52,000      
Original Conversion Shares (in shares) 58,000      
Conversion of stock, amount converted $ 0      
Conversion Shares (in shares) 52,000      
Placement Agent Warrants (1) (in shares) [3] 7,000      
Placement Agent Warrants (1) (in shares) [3] 7,000      
Conversion of Stock, Shares Converted [4] 201,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 259,000      
Adjusted Conversion Price(1) (in shares) [4] 201,000      
Conversion Shares At End of Period (in shares) 259,000      
Series A-5 Preferred Stock [Member]        
Conversion Price – At Issuance (in dollars per share) $ 11.09      
Original Conversion Price – At Issuance(2) (in dollars per share) 11.09      
Preferred Stock, Convertible, Conversion Price $ 11.09      
Stock Issued During Period, Shares, New Issues (in shares) 2,299      
Preferred Stock, Shares Issued (in shares) 2,299      
Gross Proceeds $ 2,299,000      
Issued (in shares) 2,299      
Converted (in shares) (1,487)      
Fees $ 299,000      
Converted (in shares) 1,487      
Preferred Stock, Shares Outstanding (in shares) 812      
Net Proceeds $ 2,000,000      
Outstanding (in shares) 812      
Original Conversion Shares (in shares) 207,000      
Conversion Shares – At Issuance (in shares) 207,000      
Original Conversion Shares (in shares) 207,000      
Conversion of stock, amount converted $ (134,000)      
Conversion Shares (in shares) 207,000      
Placement Agent Warrants (1) (in shares) [5] 30,000      
Placement Agent Warrants (1) (in shares) [5] 30,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 73,000      
Conversion Shares At End of Period (in shares) 73,000      
Series AAA-2 Preferred Stock Exchanges [Member]        
Price As Adjusted, Conversions (in dollars per share) $ 1.71      
Preferred Stock, Shares Issued (in shares) 2,356      
Issued (in shares) 2,356      
Converted (in shares) (100)      
Converted (in shares) 100      
Preferred Stock, Shares Outstanding (in shares) 2,256      
Outstanding (in shares) 2,256      
Original Conversion Shares (in shares) 1,378,000      
Original Conversion Shares (in shares) 1,378,000      
Conversion of stock, amount converted $ (58,000)      
Conversion of Stock, Shares Converted 0      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 1,320,000      
Adjusted Conversion Price(1) (in shares) 0      
Conversion Shares At End of Period (in shares) 1,320,000      
Series AA, AA-2, AA-3, and AA-4 Convertible Preferred Stock [Member]        
Stock Issued During Period, Shares, New Issues (in shares) 11,781      
Preferred Stock, Shares Issued (in shares) 11,781      
Gross Proceeds $ 11,781,000      
Issued (in shares) 11,781      
Converted (in shares) (5,571)      
Fees $ 1,434,000      
Converted (in shares) 5,571      
Preferred Stock, Shares Outstanding (in shares) 6,210      
Net Proceeds $ 10,347,000      
Outstanding (in shares) 6,210      
Original Conversion Shares (in shares) 1,233,000      
Conversion Shares – At Issuance (in shares) 1,229,000      
Original Conversion Shares (in shares) 1,233,000      
Conversion of stock, amount converted $ (2,219,000)      
Conversion Shares (in shares) 1,229,000      
Placement Agent Warrants (1) (in shares) [3] 165,000      
Placement Agent Warrants (1) (in shares) [3] 165,000      
Conversion of Stock, Shares Converted [4] 4,249,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 3,263,000      
Adjusted Conversion Price(1) (in shares) [4] 4,249,000      
Conversion Shares At End of Period (in shares) 3,263,000      
Series A Preferred Offerings [Member]        
Stock Issued During Period, Shares, New Issues (in shares) 12,622      
Preferred Stock, Shares Issued (in shares) 12,622      
Gross Proceeds $ 12,622,000      
Issued (in shares) 12,622      
Converted (in shares) (9,673)      
Fees $ 1,696,000      
Converted (in shares) 9,673      
Preferred Stock, Shares Outstanding (in shares) 2,949      
Net Proceeds $ 10,926,000      
Outstanding (in shares) 2,949      
Original Conversion Shares (in shares) 1,120,000      
Conversion Shares – At Issuance (in shares) 1,120,000      
Original Conversion Shares (in shares) 1,120,000      
Conversion of stock, amount converted $ (852,000)      
Conversion Shares (in shares) 1,120,000      
Placement Agent Warrants (1) (in shares) [5] 160,000      
Placement Agent Warrants (1) (in shares) [5] 160,000      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 268,000      
Conversion Shares At End of Period (in shares) 268,000      
Series AAA and AAA-2 Preferred Stock Exchanges [Member]        
Preferred Stock, Shares Issued (in shares) 6,367      
Issued (in shares) 6,367      
Converted (in shares) (225)      
Converted (in shares) 225      
Preferred Stock, Shares Outstanding (in shares) 6,142      
Outstanding (in shares) 6,142      
Original Conversion Shares (in shares) 3,774,000      
Original Conversion Shares (in shares) 3,774,000      
Conversion of stock, amount converted $ (133,000)      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 3,641,000      
Conversion Shares At End of Period (in shares) 3,641,000      
Series Preferred AAA [Member]        
Preferred Stock, Shares Issued (in shares) 14,722      
Issued (in shares) 14,722      
Converted (in shares) (225)      
Converted (in shares) 225      
Preferred Stock, Shares Outstanding (in shares) 14,497      
Outstanding (in shares) 14,497      
Original Conversion Shares (in shares) 8,728,000      
Original Conversion Shares (in shares) 8,728,000      
Conversion of stock, amount converted $ (133,000)      
Adjusted Conversion Shares as of December 31, 2023 (in shares) 8,595,000      
Conversion Shares At End of Period (in shares) 8,595,000      
[1] Issued upon final closing of the Series AAA Preferred Stock offering, effective as of the respective closing dates.
[2] 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 $2.60 as a result of the Series AA Down Round Feature described below. The Conversion price for Series AA Preferred stock outstanding as of November 30, 2023, totaling 7,322 shares of Series AA Preferred stock, was adjusted as described in the table below as a result of the Series AA Down Round Feature described below.
[3] Issued on May 26, 2023, effective as of the applicable closing date, upon final closing of the Series AA Preferred Stock offering.
[4] 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. The original conversion prices for the Series AA Preferred, as of the respective issuance dates, were as follows: Series AA - $9.43; Series AA-2 - $10.43; Series AA-3 - $9.50; Series AA-4 - $9.28; Series AA-5 - $10.60.
[5] Issued on May 26, 2023, effective as of the applicable closing date, upon final closing of the Series A Preferred Stock offering