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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating activities:    
Net loss $ (17,284) $ (13,779)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 23 24
Stock-based compensation 1,151 1,119
Changes in lease liability (55) 29
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 3,364 (2,816)
Accounts payable, accrued and other current liabilities 599 (235)
Net cash used in operating activities (12,202) (15,658)
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 0 3,107
Payment of preferred stock dividend (151) (151)
Net cash (used in) provided by financing activities (151) 2,956
Effect of exchange rate changes on cash and cash equivalents (42) (144)
Net (decrease) increase in cash and cash equivalents (12,401) (12,853)
Cash and cash equivalents, beginning of period 18,345 36,559
Cash and cash equivalents, end of period 5,944 23,706
Cash received during the period for:    
Interest 243 89
Research & Development Tax Credits 4,846 3,050
Cash paid during the period for:    
Taxes 2 2
Non cash financing activities:    
Accrual of preferred stock dividends 50 50
Deemed Dividend On Redeemable Common Stock $ 0 $ 135