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Condensed Consolidated Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Tranche B Warrants
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
Common Stock
Common Stock
Tranche B Warrants
Common Stock
Series F-1
Common Stock
Series F-2
Common Stock
Series F-3
Additional Paid in Capital
Additional Paid in Capital
Tranche B Warrants
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 (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 (16,202)                                              
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)
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          
Stock option exercise (in shares)                     468                          
Stock option exercise 2                             2                
Net loss (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)
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 (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]                                                
Stock option exercise (in shares) 32,300                                              
Net loss $ (24,852)                                              
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
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)        
Stock option exercise (in shares)                     32,300                          
Stock option exercise 169                   $ 1         168                
Net loss (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