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CONDENSED BALANCE SHEETS (UNAUDITED) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current assets:      
Cash and cash equivalents $ 2,901,000 $ 8,554,000 $ 18,120,000
Investments 323,000 0  
Other current assets 989,000 1,280,000 3,697,000
Total current assets 4,213,000 9,834,000 21,817,000
Property and equipment, net 800,000 906,000 1,324,000
Operating lease right-use-of assets 171,000 202,000 248,000
Goodwill 372,000 372,000 372,000
Intangible assets, net 33,000 42,000 94,000
Other assets 32,000 32,000 12,000
Total assets 5,621,000 11,388,000 23,867,000
Current liabilities:      
Accounts payable and accrued expenses 6,447,000 6,631,000 10,134,000
Operating lease liability 115,000 120,000 110,000
Deferred grant liability 247,000 0  
Term loan obligation, current 3,590,000 3,976,000 1,608,000
Total current liabilities 10,399,000 10,727,000 11,852,000
Noncurrent operating lease liability 59,000 85,000 141,000
Term loan obligation   0 3,786,000
Deferred grant liability   1,924,000 1,643,000
Total liabilities 10,458,000 12,736,000 17,422,000
Commitments and contingencies (Note 8)  
Stockholders' deficit:      
Preferred stock 0 0 0
Common stock 5,000 5,000 2,000
Treasury stock (500,000) (126,000) 0
Additional paid-in capital 479,420,000 479,274,000 473,628,000
Accumulated deficit (483,762,000) (480,501,000) (467,185,000)
Total stockholders' deficit (4,837,000) (1,348,000) 6,445,000
Total liabilities and stockholders' deficit $ 5,621,000 $ 11,388,000 $ 23,867,000