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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Current assets:    
Cash and cash equivalents $ 3,378 $ 18,345
Prepaid expenses and other current assets 4,066 6,066
Total current assets 7,444 24,411
Property and equipment, net 9 32
Right-of-use lease asset 93 142
Non-current deposits 1,259 3,465
Total assets 8,805 28,050
Current liabilities:    
Accounts payable 3,543 2,561
Accrued and other current liabilities 4,618 4,950
Total current liabilities 8,161 7,511
Lease liability 37 106
Total liabilities 8,198 7,617
Redeemable common stock, $0.001 par value; 0 shares issued and outstanding at December 31, 2023 and 207,807 shares issued and outstanding at December 31, 2022 (Note 11) 0 4,494
Stockholders' equity:    
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2023 and December 31, 2022; 1,058,892 shares issued and outstanding at December 31, 2023 and 628,139 shares issued and outstanding at December 31, 2022 1 1
Additional paid-in capital 429,796 422,981
Accumulated other comprehensive loss (908) (1,316)
Accumulated deficit (428,282) (405,727)
Total stockholders' equity 607 15,939
Total liabilities and stockholders' equity 8,805 28,050
6% convertible exchangeable preferred stock    
Stockholders' equity:    
Preferred stock, value 0 0
Series A Convertible Preferred Stock    
Stockholders' equity:    
Preferred stock, value 0 0
Series B Convertible Preferred Stock    
Stockholders' equity:    
Preferred stock, value $ 0 $ 0