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STATEMENTS OF STOCKHOLDERS' EQUITY - 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    
Share-based compensation 606     606  
Sale of common stock, net 18,581   $ 8 18,573  
Sale of common stock, net (in shares)     7,864,379    
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    
Conversion of Series B convertible preferred stock into common stock (in shares)   (2) 118    
Net loss (13,399)       (13,399)
Balance at Dec. 31, 2021 10,836   $ 16 457,730 (446,910)
Balance (in shares) at Dec. 31, 2021   1,952 15,510,025    
Share-based compensation 606     606  
Sale of common stock, net 15,278   $ 18 15,260  
Sale of common stock, net (in shares)     18,091,348    
Net loss (20,275)       (20,275)
Balance at Dec. 31, 2022 $ 6,445   $ 34 $ 473,596 $ (467,185)
Balance (in shares) at Dec. 31, 2022   1,952 33,601,373