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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Current assets:    
Cash and cash equivalents $ 2,798 $ 3,378
Prepaid expenses and other current assets 2,037 4,066
Total current assets 4,835 7,444
Property and equipment, net 7 9
Right-of-use lease asset 79 93
Non-current deposits 1,244 1,259
Total assets 6,165 8,805
Current liabilities:    
Accounts payable 5,200 3,543
Accrued and other current liabilities 3,150 4,618
Total current liabilities 8,350 8,161
Lease liability 21 37
Total liabilities 8,371 8,198
Stockholders' equity:    
Common stock, $0.001 par value; 100,000,000 shares authorized at March 31, 2024 and December 31, 2023; 1,318,259 shares issued and outstanding at March 31, 2024 and 1,058,892 shares issued and outstanding at December 31, 2023 1 1
Additional paid-in capital 429,919 429,796
Accumulated other comprehensive loss (898) (908)
Accumulated deficit (431,228) (428,282)
Total stockholders' equity (2,206) 607
Total liabilities and stockholders' equity 6,165 8,805
6% Convertible Exchangeable Preferred Stock    
Stockholders' equity:    
Preferred stock, value
Series A Convertible Preferred Stock    
Stockholders' equity:    
Preferred stock, value
Series B Convertible Preferred Stock    
Stockholders' equity:    
Preferred stock, value