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CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY/(DEFICIT) (UNAUDITED) - USD ($)
Total
Series F Preferred Stock [Member]
Convertible Preferred Stock [Member]
Preferred Stock [Member]
Preferred Stock [Member]
Series F Preferred Stock [Member]
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Series F Preferred Stock [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2021 $ 10,836,000         $ 1,000   $ 457,745,000   $ (446,910,000)
Balance (in shares) at Dec. 31, 2021     1,952     1,034,002        
Stock-based compensation 606,000             606,000    
Issue and sale of stock, net 15,278,000         $ 1,000   15,277,000    
Issue and sale of share           1,206,090        
Net loss (20,275,000)                 (20,275,000)
Balance at Dec. 31, 2022 6,445,000         $ 2,000   473,628,000   (467,185,000)
Balance (in shares) at Dec. 31, 2022     1,952     2,240,092        
Stock-based compensation 140,000             140,000    
Issue and sale of stock, net 895,000 $ 1,000           895,000 $ 1,000  
Issue and sale of share         1 168,164        
Net loss (4,805,000)                 (4,805,000)
Balance at Mar. 31, 2023 2,676,000         $ 2,000   474,664,000   (471,990,000)
Balance (in shares) at Mar. 31, 2023     1,952 1   2,408,256        
Balance at Dec. 31, 2022 6,445,000         $ 2,000   473,628,000   (467,185,000)
Balance (in shares) at Dec. 31, 2022     1,952     2,240,092        
Stock-based compensation 569,000             569,000    
Issue and sale of stock, net 5,005,000         $ 3,000   5,002,000    
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 75,000             75,000    
Issuance of common stock for in process research and development (in shares)           53,381        
Fractional adjustment           (1,310)        
Purchase of treasury stock (126,000)           $ (126,000)      
Purchase of treasury stock (in Shares)             (78,559)      
Net loss (13,316,000)                 (13,316,000)
Balance at Dec. 31, 2023 (1,348,000)         $ 5,000 $ (126,000) 479,274,000   (480,501,000)
Balance (in shares) at Dec. 31, 2023     1,952     4,522,656 (78,559)      
Stock-based compensation 146,000             146,000    
Purchase of treasury stock (374,000)           $ (374,000)      
Purchase of treasury stock (in Shares)             (179,866)      
Net loss (3,261,000)                 (3,261,000)
Balance at Mar. 31, 2024 $ (4,837,000)         $ 5,000 $ (500,000) $ 479,420,000   $ (483,762,000)
Balance (in shares) at Mar. 31, 2024     1,952     4,522,656 (258,425)