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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Operating activities:    
Net Income (Loss) $ (11,252) $ (8,683)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 16 17
Stock-based compensation 760 730
Changes in lease liability (40) 0
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 3,289 (926)
Accounts payable, accrued and other current liabilities (939) 172
Net cash used in operating activities (8,166) (8,690)
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 1,525
Payment of preferred stock dividend (101) (101)
Net cash (used in) provided by financing activities (101) 1,424
Effect of exchange rate changes on cash and cash equivalents 92 (209)
Net (decrease) increase in cash and cash equivalents (8,181) (7,482)
Cash and cash equivalents, beginning of period 18,345 36,559
Cash and cash equivalents, end of period 10,164 29,077
Cash received during the period for:    
Interest 193 21
Research & Development Tax Credits 4,846 3,328
Cash paid during the period for:    
Taxes 2 2
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 $ 50