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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Current assets:    
Cash and cash equivalents $ 5,944 $ 18,345
Prepaid expenses and other current assets 5,169 6,066
Total current assets 11,113 24,411
Property and equipment, net 16 32
Right-of-use lease asset 109 142
Non-current deposits 1,259 3,465
Total assets 12,497 28,050
Current liabilities:    
Accounts payable 1,571 2,561
Accrued and other current liabilities 6,577 4,950
Total current liabilities 8,148 7,511
Lease liability 52 106
Total liabilities 8,200 7,617
Redeemable common stock, $0.001 par value; 0 shares issued and outstanding at September 30, 2023 and 3,117,100 shares issued and outstanding at December 31, 2022 (Note 10) 0 4,494
Stockholders' equity:    
Preferred stock, value 0 0
Common stock, $0.001 par value; 100,000,000 shares authorized at September 30, 2023 and December 31, 2022; 12,642,822 shares issued and outstanding at September 30, 2023 and 12,539,189 shares issued and outstanding at December 31, 2022 12 9
Additional paid-in capital 428,464 422,973
Accumulated other comprehensive loss (1,168) (1,316)
Accumulated deficit (423,011) (405,727)
Total stockholders' equity 4,297 15,939
Total liabilities and stockholders' equity 12,497 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