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CONSOLIDATED CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Convertible Preferred Stock [Member]
Convertible Preferred Stock [Member]
Series B Convertible Preferred Stock [Member]
Common Stock [Member]
Common Stock [Member]
Series B Convertible Preferred Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2019 $ 1,160     $ 4   $ 426,426 $ (425,270)
Balance (in shares) at Dec. 31, 2019   1,959,000   3,880,588,000      
Stock-based compensation 12         12  
Net loss (1,087)           (1,087)
Balance at Mar. 31, 2020 85     $ 4   426,438 (426,357)
Balance (in shares) at Mar. 31, 2020   1,959,000   3,880,588,000      
Balance at Dec. 31, 2019 1,160     $ 4   426,426 (425,270)
Balance (in shares) at Dec. 31, 2019   1,959,000   3,880,588,000      
Balance at Dec. 31, 2020 $ 3,031     $ 7   436,535 (433,511)
Balance (in shares) at Dec. 31, 2020 6,749,028 1,954,000   6,749,028,000      
Stock-based compensation $ 107         107  
Sale of common stock, net 7,078     $ 2   7,076  
Sale of common stock, net (in shares)       2,534,879,000      
Conversion of Convertible Preferred Stock into common stock (share)     (2,000)   118,000    
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 10,180,525 1,952,000   10,180,525,000