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CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2020 $ 3,031   $ 7 $ 436,535 $ (433,511)
Balance (in shares) at Dec. 31, 2020   1,954 6,749,028    
Stock-based compensation 107     107  
Sale of common stock, net 7,078   $ 2 7,076  
Sale of common stock, net, shares     2,534,879    
Conversion of Series B Convertible Preferred Stock into common stock (share)   (2) 118    
Issuance of common stock for exercise of warrants 2,017   $ 1 2,016  
Issuance of common stock for exercise of warrants (in shares)     896,500    
Net loss (2,720)       (2,720)
Balance at Mar. 31, 2021 9,513   $ 10 445,734 (436,231)
Balance (in shares) at Mar. 31, 2021   1,952 10,180,525    
Balance at Dec. 31, 2020 3,031   $ 7 436,535 (433,511)
Balance (in shares) at Dec. 31, 2020   1,954 6,749,028    
Net loss (9,244)        
Balance at Sep. 30, 2021 14,755   $ 15 457,495 (442,755)
Balance (in shares) at Sep. 30, 2021   1,952 15,360,025    
Balance at Dec. 31, 2020 3,031   $ 7 436,535 (433,511)
Balance (in shares) at Dec. 31, 2020   1,954 6,749,028    
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 Mar. 31, 2021 9,513   $ 10 445,734 (436,231)
Balance (in shares) at Mar. 31, 2021   1,952 10,180,525    
Stock-based compensation 138     138  
Sale of common stock, net 5,094   $ 2 5,092  
Sale of common stock, net, shares     1,907,000    
Net loss (2,800)       (2,800)
Balance at Jun. 30, 2021 11,945   $ 12 450,964 (439,031)
Balance (in shares) at Jun. 30, 2021   1,952 12,087,525    
Stock-based compensation 180     180  
Sale of common stock, net 6,354   $ 3 6,351  
Sale of common stock, net, shares     3,272,500    
Net loss (3,724)       (3,724)
Balance at Sep. 30, 2021 14,755   $ 15 457,495 (442,755)
Balance (in shares) at Sep. 30, 2021   1,952 15,360,025    
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  
Sale of common stock, net 7,742   $ 6 7,736  
Sale of common stock, net, shares     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    
Net loss (14,617)        
Balance at Sep. 30, 2022 11,404   $ 32 472,899 (461,527)
Balance (in shares) at Sep. 30, 2022   1,952 32,570,002    
Balance at Mar. 31, 2022 14,642   $ 22 465,646 (451,026)
Balance (in shares) at Mar. 31, 2022   1,952 22,197,635    
Stock-based compensation 167     167  
Sale of common stock, net 152     152  
Sale of common stock, net, shares     271,047    
Net loss (5,282)       (5,282)
Balance at Jun. 30, 2022 9,679   $ 22 465,965 (456,308)
Balance (in shares) at Jun. 30, 2022   1,952 22,468,682    
Stock-based compensation 129     129  
Sale of common stock, net 6,815   $ 10 6,805  
Sale of common stock, net, shares     10,101,320    
Net loss (5,219)       (5,219)
Balance at Sep. 30, 2022 $ 11,404   $ 32 $ 472,899 $ (461,527)
Balance (in shares) at Sep. 30, 2022   1,952 32,570,002