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Condensed Consolidated Statements of Stockholders’ Equity (Unaudited) - USD ($)
$ in Thousands
Total
Series F-4
Series F-1
Series F-2
Series F-3
Stock options
Employee stock purchase plan
Preferred Stock
Preferred Stock
Series F-2
Preferred Stock
Series F-3
Preferred Stock
Series E
Common Stock
Common Stock
Series F-4
Common Stock
Series F-1
Common Stock
Series F-2
Common Stock
Series F-3
Common Stock
Series E
Additional Paid in Capital
Additional Paid in Capital
Series F-4
Additional Paid in Capital
Series F-1
Additional Paid in Capital
Series F-2
Additional Paid in Capital
Series F-3
Additional Paid in Capital
Stock options
Additional Paid in Capital
Employee stock purchase plan
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2022               11,357       10,046,571                            
Beginning balance at Dec. 31, 2022 $ (5,859)             $ 0       $ 100           $ 451,608             $ (457,484) $ (83)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                    
Compensation expense           $ 1,661                                 $ 1,661      
Private placement -issuance of common shares, net of expenses (in shares)                       19,646                            
Private placement -issuance of common shares, net of expenses 56                     $ 1           55                
Issuance of common stock with the employee stock purchase plan (in shares)                       15,417                            
Issuance of common stock with the employee stock purchase plan 47                                 47                
Net (loss) income (9,000)                                               (9,000)  
Foreign currency translation adjustments 19                                                 19
Ending balance (in shares) at Mar. 31, 2023               11,357       10,081,634                            
Ending balance at Mar. 31, 2023 (13,076)             $ 0       $ 101           453,371             (466,484) (64)
Beginning balance (in shares) at Dec. 31, 2022               11,357       10,046,571                            
Beginning balance at Dec. 31, 2022 (5,859)             $ 0       $ 100           451,608             (457,484) (83)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                    
Net (loss) income (36,542)                                                  
Ending balance (in shares) at Sep. 30, 2023               37,787       19,688,991                            
Ending balance at Sep. 30, 2023 24,719             $ 0       $ 197           518,607             (494,026) (59)
Beginning balance (in shares) at Mar. 31, 2023               11,357       10,081,634                            
Beginning balance at Mar. 31, 2023 (13,076)             $ 0       $ 101           453,371             (466,484) (64)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                    
Compensation expense           1,661                                 1,661      
Conversion of shares (in shares)                       538,828   4,629,539                        
Conversion of shares 5   $ 11,269                 $ 5   $ 47           $ 11,222            
Preferred F-2 Shares Issuance (in shares)                 9,624                                  
Preferred F-2 Shares Issuance       $ 7,099                                 $ 7,099          
Issuance of common stock related to stock option exercises (in shares)                       468                            
Issuance of common stock related to stock option exercises 2                                 2                
Net (loss) income (7,202)                                               (7,202)  
Ending balance (in shares) at Jun. 30, 2023               20,981       15,250,469                            
Ending balance at Jun. 30, 2023 (242)             $ 0       $ 153           473,355             (473,686) (64)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                    
Compensation expense 47         2,783                       47         2,783      
Issuance of common stock with the employee stock purchase plan (in shares)                       26,018                            
Issuance of common stock with the employee stock purchase plan 76                                 76                
Conversion of shares (in shares)                 (4,721) (13,232) (100) 31,110     1,430,603 2,940,440 10,000                  
Conversion of shares       0 $ 1                   $ 14 $ 30         (14) $ (29)        
Preferred F-2 Shares Issuance (in shares)                   34,859                                
Preferred F-2 Shares Issuance         42,388                                 42,388        
Issuance of common stock related to stock option exercises (in shares)                       351                            
Issuance of common stock related to stock option exercises 1                                 1                
Net (loss) income (20,340)                                               (20,340)  
Foreign currency translation adjustments 5                                                 5
Ending balance (in shares) at Sep. 30, 2023               37,787       19,688,991                            
Ending balance at Sep. 30, 2023 24,719             $ 0       $ 197           518,607             (494,026) (59)
Beginning balance (in shares) at Dec. 31, 2023               24,819       22,761,554                            
Beginning balance at Dec. 31, 2023 15,777             $ 0       $ 228           520,576             (505,162) 135
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                    
Compensation expense           2,895 $ 50                               2,895 $ 50    
Private placement -issuance of common shares, net of expenses (in shares)                       876,627                            
Private placement -issuance of common shares, net of expenses 6,912                     $ 8           6,904                
Issuance of common stock with the employee stock purchase plan (in shares)                       21,140                            
Issuance of common stock with the employee stock purchase plan 74                                 74                
Conversion of shares (in shares)                   (8,010)           1,779,998                    
Conversion of shares         1                     $ 18           (17)        
Net (loss) income (11,111)                                               (11,111)  
Unrealized gain (loss) on investments 8                                                 8
Foreign currency translation adjustments 14                                                 14
Ending balance (in shares) at Mar. 31, 2024               16,809       25,439,319                            
Ending balance at Mar. 31, 2024 14,620             $ 0       $ 254           530,482             (516,273) 157
Beginning balance (in shares) at Dec. 31, 2023               24,819       22,761,554                            
Beginning balance at Dec. 31, 2023 $ 15,777             $ 0       $ 228           520,576             (505,162) 135
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                    
Issuance of common stock related to stock option exercises (in shares) 70,088                                                  
Net (loss) income $ (22,988)                                                  
Ending balance (in shares) at Sep. 30, 2024               12,342       28,019,599                            
Ending balance at Sep. 30, 2024 8,571             $ 0       $ 280           536,430             (528,150) 11
Beginning balance (in shares) at Mar. 31, 2024               16,809       25,439,319                            
Beginning balance at Mar. 31, 2024 14,620             $ 0       $ 254           530,482             (516,273) 157
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                    
Compensation expense           3,021 48                               3,021 48    
Prior quarter private placement - expenses (141)                                 (141)                
Warrant exercise and conversion - F-4 Preferred to Common (in shares)                         41,666                          
Warrant exercise and conversion - F-4 Preferred to Common   $ 355                                 $ 355              
Conversion of shares (in shares)                 (1,457) (3,010)   1,307,706     441,514 668,888                    
Conversion of shares 10     $ 0 $ 0             $ 13     $ 4 $ 7   (3)     $ (4) $ (7)        
Issuance of common stock related to stock option exercises (in shares)                       32,300                            
Issuance of common stock related to stock option exercises 169                     $ 1           168                
Net (loss) income (13,741)                                               (13,741)  
Unrealized gain (loss) on investments (141)                                                 (141)
Foreign currency translation adjustments (8)                                                 (8)
Ending balance (in shares) at Jun. 30, 2024               12,342       27,931,393                            
Ending balance at Jun. 30, 2024 4,192             $ 0       $ 279           533,919             (530,014) 8
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                    
Compensation expense           $ 2,092 $ 49                               $ 2,092 $ 49    
Issuance of common stock with the employee stock purchase plan (in shares)                       50,418                            
Issuance of common stock with the employee stock purchase plan 175                     $ 1           174                
Issuance of common stock related to stock option exercises (in shares)                       37,788                            
Issuance of common stock related to stock option exercises 196                                 196                
Net (loss) income 1,864                                               1,864  
Unrealized gain (loss) on investments (14)                                                 (14)
Foreign currency translation adjustments 17                                                 17
Ending balance (in shares) at Sep. 30, 2024               12,342       28,019,599                            
Ending balance at Sep. 30, 2024 $ 8,571             $ 0       $ 280           $ 536,430             $ (528,150) $ 11