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STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Convertible Preferred Stock [Member]
Preferred Stock [Member]
Preferred Stock [Member]
Series F Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Treasury Stock [Member]
Balance at Dec. 31, 2021 $ 10,836       $ 1 $ 457,745 $ (446,910)  
Balance (in shares) at Dec. 31, 2021   1,952     1,034,002      
Share-based compensation 606         606    
Issue and sale of stock, net 15,278       $ 1 15,277    
Issue and sale of share         1,206,090      
Net loss (20,275)           (20,275)  
Balance at Dec. 31, 2022 6,445       $ 2 473,628 (467,185)  
Balance (in shares) at Dec. 31, 2022   1,952     2,240,092      
Share-based compensation 569         569    
Issue and sale of stock, net 5,005       $ 3 5,002    
Issue and sale of share       1 2,230,493      
Redemption of Series F preferred stock (in shares)     (1)          
Issuance of common stock for in process research and development 75         75    
Issuance of common stock for in process research and development (in shares)         53,381      
Fractional adjustment         (1,310)      
Purchase of treasury stock (126)             $ (126)
Purchase of treasury stock (in Shares)               (78,559)
Net loss (13,316)           (13,316)  
Balance at Dec. 31, 2023 $ (1,348)       $ 5 $ 479,274 $ (480,501) $ (126)
Balance (in shares) at Dec. 31, 2023   1,952     4,522,656     (78,559)