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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Operating activities:    
Net loss $ (13,779) $ (13,593)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 24 36
Stock-based compensation 1,119 853
Changes in lease liability 29 173
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (2,816) (2,655)
Accounts payable, accrued and other current liabilities (235) 1,195
Net cash used in operating activities (15,658) (13,991)
Investing activities:    
Purchase of property, plant and equipment (7) (25)
Net cash used in investing activities (7) (25)
Financing activities:    
Proceeds, net of issuance costs, from issuing common stock and warrants 3,107 21,001
Payment of preferred stock dividend (151) (151)
Net cash (used in) provided by financing activities 2,956 20,850
Effect of exchange rate changes on cash and cash equivalents (144) (21)
Net (decrease) increase in cash and cash equivalents (12,853) 6,813
Cash and cash equivalents, beginning of period 36,559 33,406
Cash and cash equivalents, end of period 23,706 40,219
Supplemental cash flow information:    
Interest 89 13
Research & Development Tax Credits 3,050 1,352
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 $ 50