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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Current assets:    
Cash and cash equivalents $ 4,912 $ 8,554
Investments 3,523  
Other current assets 945 1,280
Total current assets 9,380 9,834
Property and equipment, net 732 906
Operating lease right-of-use assets 139 202
Goodwill 372 372
Intangible assets, net 557 42
Other assets 32 32
Total assets 11,212 11,388
Current liabilities:    
Accounts payable and accrued expenses 6,946 6,631
Operating lease liability 92 120
Warrant liability 6,160  
Deferred grant liability 2,297  
Line of credit 3,292  
Term loan obligation, current   3,976
Total current liabilities 18,787 10,727
Noncurrent operating lease liability 50 85
Deferred grant liability   1,924
Total liabilities 18,837 12,736
Commitments and contingencies (Note 10)
Stockholders' deficit:    
Preferred stock, $0.001 par value; 5,000,000 shares authorized; 1,952 shares issued and outstanding at June 30, 2024 and December 31, 2023, respectively
Common stock, $0.001 par value; 100,000,000 shares authorized; 5,962,644 and 5,704,219 issued and outstanding at June 30, 2024, and 4,522,656 issued and 4,444,097 outstanding as of December 31, 2023, respectively 6 5
Treasury stock (at cost, 258,425 and 78,559 shares as of June 30, 2024 and December 31, 2023, respectively) (500) (126)
Additional paid-in capital 479,571 479,274
Accumulated deficit (486,702) (480,501)
Total stockholders' deficit (7,625) (1,348)
Total liabilities and stockholders' deficit $ 11,212 $ 11,388