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Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($)
$ in Thousands
Total
Preferred F-1 Stock
Preferred F-2 Stock
Preferred F-3 Stock
Common Stock
Common Stock
Preferred F-1 Stock
Common Stock
Preferred F-2 Stock
Common Stock
Preferred F-3 Stock
Common Stock
Preferred Series E Stock
Preferred Stock
Preferred Stock
Preferred F-2 Stock
Preferred Stock
Preferred F-3 Stock
Preferred Stock
Preferred Series E Stock
Additional Paid in Capital
Additional Paid in Capital
Preferred F-1 Stock
Additional Paid in Capital
Preferred F-2 Stock
Additional Paid in Capital
Preferred F-3 Stock
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2021         7,906,728         11,357                  
Beginning Balance at Dec. 31, 2021 $ 11,952       $ 79         $ 0       $ 432,831       $ (420,976) $ 18
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Compensation expense for issuance of stock options 2,271                         2,271          
Net loss (9,000)                                 (9,000)  
Total comprehensive income 2                                   2
Ending Balance (in shares) at Mar. 31, 2022         7,906,728         11,357                  
Ending Balance at Mar. 31, 2022 5,225       $ 79         $ 0       435,102       (429,976) 20
Beginning Balance (in shares) at Dec. 31, 2021         7,906,728         11,357                  
Beginning Balance at Dec. 31, 2021 11,952       $ 79         $ 0       432,831       (420,976) 18
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Net loss (28,036)                                    
Ending Balance (in shares) at Sep. 30, 2022         8,597,682         11,357                  
Ending Balance at Sep. 30, 2022 (5,246)       $ 86         $ 0       443,737       (449,012) (57)
Beginning Balance (in shares) at Mar. 31, 2022         7,906,728         11,357                  
Beginning Balance at Mar. 31, 2022 5,225       $ 79         $ 0       435,102       (429,976) 20
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Compensation expense for issuance of stock options 2,119                         2,119          
Net loss (10,159)                                 (10,159)  
Total comprehensive income (31)                                   (31)
Ending Balance (in shares) at Jun. 30, 2022         7,906,728         11,357                  
Ending Balance at Jun. 30, 2022 (2,846)       $ 79         $ 0       437,221       (440,135) (11)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Compensation expense for issuance of stock options 1,627                         1,627          
Private placement - issuance of common stock and prefunded warrants, net of expense (in shares)         690,954                            
Private placement - issuance of common stock and prefunded warrants, net of expense 4,896       $ 7                 4,889          
Net loss (8,877)                                 (8,877)  
Total comprehensive income (46)                                   (46)
Ending Balance (in shares) at Sep. 30, 2022         8,597,682         11,357                  
Ending Balance at Sep. 30, 2022 (5,246)       $ 86         $ 0       443,737       (449,012) (57)
Beginning Balance (in shares) at Dec. 31, 2022         10,046,571         11,357                  
Beginning Balance at Dec. 31, 2022 (5,859)       $ 100         $ 0       451,608       (457,484) (83)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Compensation expense for issuance of stock options 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)  
Total comprehensive income 19                                   19
Ending Balance (in shares) at Mar. 31, 2023         10,081,634         11,357                  
Ending Balance at Mar. 31, 2023 (13,076)       $ 101         $ 0       453,371       (466,484) (64)
Beginning Balance (in shares) at Dec. 31, 2022         10,046,571         11,357                  
Beginning Balance at Dec. 31, 2022 $ (5,859)       $ 100         $ 0       451,608       (457,484) (83)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Issuance of common stock related to stock option exercises (in shares) 819                                    
Net loss $ (36,542)                                    
Ending Balance (in shares) at Sep. 30, 2023         19,688,991         37,787                  
Ending Balance at Sep. 30, 2023 24,719       $ 197         $ 0       518,607       (494,026) (59)
Beginning Balance (in shares) at Mar. 31, 2023         10,081,634         11,357                  
Beginning Balance at Mar. 31, 2023 (13,076)       $ 101         $ 0       453,371       (466,484) (64)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Compensation expense for issuance of stock options 1,661                         1,661          
Stock issued during period (in shares)                     9,624                
Stock issued during the period     $ 7,099                         $ 7,099      
Conversion of shares (in shares)         538,828 4,629,539                          
Conversion of shares 5 $ 11,269     $ 5 $ 47                 $ 11,222        
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 (7,202)                                 (7,202)  
Total comprehensive income 0                                   0
Ending Balance (in shares) at Jun. 30, 2023         15,250,469         20,981                  
Ending Balance at Jun. 30, 2023 (242)       $ 153         $ 0       473,355       (473,686) (64)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Compensation expense for issuance of stock options 2,783                         2,783          
Stock issued during period (in shares)                       34,859              
Stock issued during the period       $ 42,388                         $ 42,388    
Conversion of shares (in shares)         31,110   1,430,603 2,940,440 10,000   (4,721) (13,232) (100)            
Conversion of shares     $ 0 $ 1     $ 14 $ 30               $ (14) $ (29)    
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          
Issuance of common stock related to stock option exercises (in shares)         351                            
Issuance of common stock related to stock option exercises 1                         1          
Compensation expense for issuance of employee stock purchase plan 47                         47          
Net loss (20,340)                                 (20,340)  
Total comprehensive income 5                                   5
Ending Balance (in shares) at Sep. 30, 2023         19,688,991         37,787                  
Ending Balance at Sep. 30, 2023 $ 24,719       $ 197         $ 0       $ 518,607       $ (494,026) $ (59)