Annual report [Section 13 and 15(d), not S-K Item 405]

Consolidated Statements of Stockholders??? Equity

v3.25.1
Consolidated Statements of Stockholders’ Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
 [1]
Accumulated Deficit
Series A Preferred Stock
Preferred Stock
Series A Preferred Stock
Common Stock
 [1]
Series B Preferred Stock
Preferred Stock
Series B Preferred Stock
Common Stock
 [1]
Series C Preferred Stock
Preferred Stock
Series C Preferred Stock
Common Stock
 [1]
Series D Preferred Stock
Preferred Stock
Series E Preferred Stock
Series E Preferred Stock
Preferred Stock
Series E Preferred Stock
Common Stock
Series E Preferred Stock
Additional Paid-in Capital
 [1]
Series F Preferred Stock
Preferred Stock
Series F Preferred Stock
Common Stock
 [1]
Series F-1 Preferred Stock
Preferred Stock
Series F-1 Preferred Stock
Common Stock
 [1]
Series F-2 Preferred Stock
Preferred Stock
Series F-2 Preferred Stock
Common Stock
 [1]
Beginning balance (in shares) at Dec. 31, 2022   16 [1]     251   1,443   500,756   1,058   0     0   0   0  
Beginning balance at Dec. 31, 2022 $ 530 $ 0 [1] $ 88,535 $ (88,005) $ 0   $ 0   $ 0   $ 0   $ 0     $ 0   $ 0   $ 0  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                          
Exercise of common stock warrants (in shares) [1]   5                                      
Exercise of common stock warrants 2,062   2,062                                    
Issuance of common stock upon conversion (in shares) [1]   2                       4              
Issuance of common stock in connection with conversion of notes 516   516                 $ 1     $ 1            
Issuance of common stock in connection with equity line of credit, net of issuance costs (in shares) [1]   178                                      
Issuance of common stock in connection with equity line of credit, net of issuance costs 4,489   4,489                                    
Issuance of common stock/at-the-market offering, net of issuance costs (in shares) [1]   869                                      
Issuance of common stock/at-the-market offering, net of issuance costs 8,228 $ 0 [1] 8,228                                    
Issuance of Series E preferred stock in connection with LOC 4,350   4,350                                    
Deemed dividend for repricing of Series D preferred stock 0   6 (6)                                  
Commitment to issue shares of common stock in connection with March waiver agreement 298   298                                    
Issuance of common stock in connection with Series A and Series B Dividends (in shares) [1]   1                                      
Issuance of common stock in connection with conversion of October Notes (in shares) [1]   12                                      
Issuance of common stock in connection with conversion of October Notes 2,166   2,166                                    
Dividends paid in shares of Series D preferred stock (in shares)                     139                    
Series D preferred stock exchanged for Series F preferred stock in connection with Exchange Agreements (in shares)                     (1,197)         1,847          
Series D preferred stock exchanged for Series F preferred stock in connection with Exchange Agreements (450)   (450)                                    
Conversion of Demand Notes and October Notes into Series F preferred stock in connection with Exchange Agreements (in shares)                               3,198          
Conversion of Demand Notes and October Notes into Series F preferred stock in connection with Exchange Agreements 1,276   1,276                                    
Conversion of January Notes into Series F preferred stock in connection with Exchange Agreements (in shares)                               206          
Conversion of January Notes into Series F preferred stock in connection with Exchange Agreements 82   82                                    
Issuance of Series F-1 preferred stock (in shares)                                   3,583      
Issuance of Series F-1 preferred stock 1,372   1,372                                    
Issuance of Series F-2 preferred stock (in shares)                                       1,153  
Issuance of Series F-2 preferred stock 464   464                                    
Conversion of Series F preferred stock into common stock (in shares)   5 [1]                           (803)          
Conversion of Series F-1 preferred stock into common stock (in shares)   15 [1]                               (2,930)      
Commitment to issue shares of common stock in connection with January Notes 2,410   2,410                                    
Commitment to issue shares of common stock in connection with LOC Notes 230   230                                    
Commitment to issue shares of Series E preferred stock in connection with LOC Notes 3,363   3,363                                    
Commitment to issue shares of common stock in connection with Demand Notes 286   286                                    
Issuance of common stock to settle commitment shares (in shares) [1]   26                                      
Issuance of common stock to settle commitment shares 0                                        
Issuance of common stock in connection with January Notes Settlement (in shares) [1]   9                                      
Issuance of common stock in connection with January Notes Settlement 1,160   1,160                                    
Issuance of common stock in connection with equity line of credit (in shares) [1]   1                                      
Issuance of common stock in connection with equity line of credit 114   114                                    
Stock-based compensation (in shares) [1]   2                                      
Stock-based compensation 714   714                                    
Net loss (28,984)     (28,984)                                  
Ending balance (in shares) at Dec. 31, 2023   1,145 [1]     251   1,443   500,756   0   0     4,448   653   1,153  
Ending balance at Dec. 31, 2023 4,677 $ 0 [1] 121,672 (116,995) $ 0   $ 0   $ 0   $ 0   $ 0     $ 0   $ 0   $ 0  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                          
Issuance of common stock upon conversion (in shares)         251 242 1,443 1,472 500,756 521           4,448 4,323 653 758 1,153 936
Issuance of common stock in connection with equity line of credit, net of issuance costs (in shares) [1]   154,887                                      
Issuance of common stock in connection with equity line of credit, net of issuance costs 16,653   16,653                                    
Issuance of common stock/at-the-market offering, net of issuance costs (in shares) [1]   619,453                                      
Issuance of common stock/at-the-market offering, net of issuance costs 21,547   21,547                                    
Vesting of restricted stock units (in shares) [1]   4,218                                      
Issuance of common stock in connection with warrant exchange (in shares) [1]   334                                      
Issuance of common stock in connection with warrant exchange 63   63                                    
Conversion of accrued Series F and F-1 preferred stock dividends liability to common stock (in shares) [1]   172                                      
Issuance of common stock in connection with employee inducement award (Note 8) (in shares) [1]   1,334                                      
Issuance of common stock in connection with employee inducement award (Note 7) 292   292                                    
Stock-based compensation 4,958   4,958                                    
Net loss (25,946)     (25,946)                                  
Ending balance (in shares) at Dec. 31, 2024   790,774 [1]     0   0   0   0   0     0   0   0  
Ending balance at Dec. 31, 2024 $ 22,244 $ 0 [1] $ 165,185 $ (142,941) $ 0   $ 0   $ 0   $ 0   $ 0     $ 0   $ 0   $ 0  
[1] Amounts for both periods presented have been retroactively adjusted to reflect the 1-for-150 reverse stock splits effected on June 25, 2024 and January 30, 2025. See Note 1 for details.