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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities:    
Net loss $ (2,946) $ (5,804)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 2 8
Stock-based compensation 203 401
Changes in lease liability (16) (26)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 2,020 (1,234)
Accounts payable, accrued and other current liabilities 254 (206)
Net cash used in operating activities (483) (6,861)
Investing activities:    
Purchase of property, plant and equipment   (6)
Net cash used in investing activities   (6)
Financing activities:    
Costs from issuing common stock and pre-funded warrants (79)  
Payment of preferred stock dividend   (50)
Net cash used in financing activities (79) (50)
Effect of exchange rate changes on cash and cash equivalents (18) 7
Net (decrease) in cash and cash equivalents (580) (6,910)
Cash and cash equivalents, beginning of period 3,378 18,345
Cash and cash equivalents, end of period 2,798 11,435
Cash received during the period for:    
Interest 1 116
Research & development tax credits 2,925  
Cash paid during the period for:    
Taxes $ 2 2
Non cash financing activities:    
Accrual of preferred stock dividends   $ 50