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CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Convertible Preferred Stock [Member]
Series F Preferred Stock [Member]
Preferred Stock [Member]
Preferred Stock [Member]
Series F Preferred Stock [Member]
Common 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         $ 1 $ 457,745   $ (446,910)
Balance (in shares) at Dec. 31, 2021   1,952       1,034,002      
Stock-based compensation 180           180    
Issue and sale of stock, net 7,742           7,742    
Issue and sale of share           445,840      
Net loss (4,116)               (4,116)
Balance at Mar. 31, 2022 14,642         $ 1 465,667   (451,026)
Balance (in shares) at Mar. 31, 2022   1,952       1,479,842      
Balance at Dec. 31, 2021 10,836         $ 1 457,745   (446,910)
Balance (in shares) at Dec. 31, 2021   1,952       1,034,002      
Net loss (14,617)                
Balance at Sep. 30, 2022 11,404         $ 2 472,929   (461,527)
Balance (in shares) at Sep. 30, 2022   1,952       2,171,333      
Balance at Dec. 31, 2021 10,836         $ 1 457,745   (446,910)
Balance (in shares) at Dec. 31, 2021   1,952       1,034,002      
Balance at Dec. 31, 2022 6,445         $ 2 473,628   (467,185)
Balance (in shares) at Dec. 31, 2022   1,952       2,240,092      
Balance at Mar. 31, 2022 14,642         $ 1 465,667   (451,026)
Balance (in shares) at Mar. 31, 2022   1,952       1,479,842      
Stock-based compensation 167           167    
Issue and sale of stock, net 152           152    
Issue and sale of share           18,070      
Net loss (5,282)               (5,282)
Balance at Jun. 30, 2022 9,679         $ 1 465,986   (456,308)
Balance (in shares) at Jun. 30, 2022   1,952       1,497,912      
Stock-based compensation 129           129    
Issue and sale of stock, net 6,815         $ 1 6,814    
Issue and sale of share           673,421      
Net loss (5,219)               (5,219)
Balance at Sep. 30, 2022 11,404         $ 2 472,929   (461,527)
Balance (in shares) at Sep. 30, 2022   1,952       2,171,333      
Balance at Dec. 31, 2022 6,445         $ 2 473,628   (467,185)
Balance (in shares) at Dec. 31, 2022   1,952       2,240,092      
Stock-based compensation 140           140    
Issue and sale of stock, net 895   $ 1       895 $ 1  
Issue and sale of share         1 168,164      
Net loss (4,805)               (4,805)
Balance at Mar. 31, 2023 2,676         $ 2 474,664   (471,990)
Balance (in shares) at Mar. 31, 2023   1,952   1   2,408,256      
Balance at Dec. 31, 2022 6,445         $ 2 473,628   (467,185)
Balance (in shares) at Dec. 31, 2022   1,952       2,240,092      
Net loss (9,506)                
Balance at Sep. 30, 2023 2,622         $ 5 479,308   (476,691)
Balance (in shares) at Sep. 30, 2023   1,952       4,522,656      
Balance at Mar. 31, 2023 2,676         $ 2 474,664   (471,990)
Balance (in shares) at Mar. 31, 2023   1,952   1   2,408,256      
Redemption of Series F preferred stock (in shares)       (1)          
Fractional adjustment           (1,310)      
Stock-based compensation 140           140    
Issue and sale of stock, net 1,328         $ 1 1,327    
Issue and sale of share           472,674      
Net loss (1,482)               (1,482)
Balance at Jun. 30, 2023 2,662         $ 3 476,131   (473,472)
Balance (in shares) at Jun. 30, 2023   1,952       2,879,620      
Stock-based compensation 148           148    
Issue and sale of stock, net 2,956         $ 2 2,954    
Issue and sale of share           1,589,655      
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      
Net loss (3,219)               (3,219)
Balance at Sep. 30, 2023 $ 2,622         $ 5 $ 479,308   $ (476,691)
Balance (in shares) at Sep. 30, 2023   1,952       4,522,656