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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating activities:    
Net Income (Loss) $ (22,555) $ (21,198)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 31 32
Stock-based compensation 1,473 1,506
Changes in lease liability (69) 40
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 4,712 (3,784)
Accounts payable, accrued and other current liabilities 296 2,577
Net cash used in operating activities (16,112) (20,827)
Investing activities:    
Purchase of property, plant and equipment (6) (7)
Net cash used in investing activities (6) (7)
Financing activities:    
Proceeds, net of issuance costs, from issuing common stock and warrants 1,049 3,199
Payment of preferred stock dividend (201) (201)
Net cash (used in) provided by financing activities 848 2,998
Effect of exchange rate changes on cash and cash equivalents 303 (378)
Net (decrease) in cash and cash equivalents (14,967) (18,214)
Cash and cash equivalents, beginning of period 18,345 36,559
Cash and cash equivalents, end of period 3,378 18,345
Cash received during the period for:    
Interest 266 211
Research & Development Tax Credits 4,846 3,312
Cash paid during the period for:    
Taxes 2 2
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 50
Accretion on redeemable common stock   $ 135