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Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($)
$ in Thousands
Total
Preferred F-1 Stock
Series F-2
Common Stock
Common Stock
Preferred F-1 Stock
Preferred Stock
Preferred Stock
Series F-2
Additional Paid in Capital
Additional Paid in Capital
Preferred F-1 Stock
Additional Paid in Capital
Series F-2
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Preferred stock, par value (in dollars per share) $ 0.01                      
Common stock, par value (in dollars per share) $ 0.01                      
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 (19,159)                      
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]                        
Preferred stock, par value (in dollars per share) $ 0.01                      
Common stock, par value (in dollars per share) $ 0.01                      
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]                        
Preferred stock, par value (in dollars per share) $ 0.01                      
Common stock, par value (in dollars per share) 0.01                      
Preferred stock, par value (in dollars per share) 0.01                      
Common stock, par value (in dollars per share) $ 0.01                      
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]                        
[Series E] Warrant Exercise (in shares)     9,624                  
Issuance of common stock related to stock option exercises (in shares) 468                      
Net loss $ (16,202)                      
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]                        
Preferred stock, par value (in dollars per share) $ 0.01                      
Common stock, par value (in dollars per share) $ 0.01                      
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    
[Series E] Warrant Exercise (in shares)       538,828 4,629,539              
Prefunded warrant exercise $ 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)  
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]                        
Preferred stock, par value (in dollars per share) $ 0.01                      
Common stock, par value (in dollars per share) $ 0.01