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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         $ 16 $ 457,730   $ (446,910)
Balance (in shares) at Dec. 31, 2021   1,952       15,510,025      
Stock-based compensation 180           180    
Issue and sale of stock, net 7,742         $ 6 7,736    
Issue and sale of share           6,687,610      
Net loss (4,116)               (4,116)
Balance at Mar. 31, 2022 14,642         $ 22 465,646   (451,026)
Balance (in shares) at Mar. 31, 2022   1,952       22,197,635      
Balance at Dec. 31, 2021 10,836         $ 16 457,730   (446,910)
Balance (in shares) at Dec. 31, 2021   1,952       15,510,025      
Balance at Dec. 31, 2022 6,445         $ 34 473,596   (467,185)
Balance (in shares) at Dec. 31, 2022   1,952       33,601,373      
Stock-based compensation 140           140    
Issue and sale of stock, net 895   $ 1     $ 2 893 $ 1  
Issue and sale of share         1 2,522,460      
Net loss (4,805)               (4,805)
Balance at Mar. 31, 2023 $ 2,676         $ 36 $ 474,630   $ (471,990)
Balance (in shares) at Mar. 31, 2023   1,952   1   36,123,833