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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Current assets:    
Cash and cash equivalents $ 10,164 $ 18,345
Prepaid expenses and other current assets 5,130 6,066
Total current assets 15,294 24,411
Property and equipment, net 24 32
Right-of-use lease asset 124 142
Non-current deposits 1,000 2,916
Total assets 16,442 27,501
Current liabilities:    
Accounts payable 2,169 2,561
Accrued and other current liabilities 4,577 4,831
Total current liabilities 6,746 7,392
Lease liability 66 106
Total liabilities 6,812 7,498
Redeemable common stock, $0.001 par value, 3,117,100 shares issued and outstanding at June 30, 2023 and December 31, 2022 (Note 10) 4,494 4,494
Stockholders' equity:    
Common stock, $0.001 par value; 100,000,000 shares authorized at June 30, 2023 and December 31, 2022; 12,642,822 shares issued and outstanding at June 30, 2023 and 12,539,189 shares issued and outstanding at December 31, 2022 9 9
Additional paid-in capital 423,633 422,973
Accumulated other comprehensive loss (1,097) (1,316)
Accumulated deficit (417,409) (406,157)
Total stockholders' equity 5,136 15,509
Total liabilities and stockholders' equity 16,442 27,501
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