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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    
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