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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Current assets:    
Cash and cash equivalents $ 13,289,000 $ 76,000
Investments 3,312,000 3,530,000
Grant receivable   571,000
Other current assets 985,000 1,082,000
Total current assets 17,586,000 5,259,000
Property and equipment, net 273,000 448,000
Operating lease right-of-use assets 20,000 73,000
Goodwill 372,000 372,000
Intangible assets, net 374,000 469,000
Other assets 45,000 12,000
Total assets 18,670,000 6,633,000
Current liabilities:    
Accounts payable and accrued expenses 11,623,000 11,288,000
Operating lease liability 21,000 44,000
Deferred grant liability 1,972,000 927,000
Line of credit   3,292,000
Total current liabilities 13,616,000 15,551,000
Noncurrent operating lease liability   31,000
Total liabilities 13,616,000 15,582,000
Commitments and contingencies (Note 8)
Stockholders' equity (deficit):    
Preferred stock, $0.001 par value; 5,000,000 shares authorized; 1,952 shares issued and outstanding as of September 30, 2025 and December 31, 2024, respectively
Common stock, $0.001 par value; 2,000,000,000 shares authorized; 131,863,969 shares issued; and 131,605,544 shares outstanding as of September 30, 2025, and 100,000,00 shares authorized; 6,154,758 shares issued; and 5,896,333 shares outstanding as of December 31, 2024, respectively 132,000 6,000
Treasury stock (at cost), 258,425 shares as of September 30, 2025 and December 31, 2024, respectively (500,000) (500,000)
Additional paid-in capital 515,574,000 485,024,000
Accumulated deficit (510,152,000) (493,479,000)
Total stockholders' equity (deficit) 5,054,000 (8,949,000)
Total liabilities and stockholders' equity $ 18,670,000 $ 6,633,000