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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Operating activities:    
Net loss $ (6,203) $ (11,252)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 4 16
Stock-based compensation 392 760
Changes in lease liability (32) (40)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 3,196 3,289
Accounts payable, accrued and other current liabilities (924) (939)
Net cash used in operating activities (3,567) (8,166)
Investing activities:    
Purchase of property, plant and equipment 0 (6)
Net cash used in investing activities 0 (6)
Financing activities:    
Proceeds from issuing common stock and pre-funded warrants, net 6,210 0
Payment of preferred stock dividend 0 (101)
Net cash provided by (used) in financing activities 6,210 (101)
Effect of exchange rate changes on cash and cash equivalents (21) 92
Net increase (decrease) in cash and cash equivalents 2,622 (8,181)
Cash and cash equivalents, beginning of period 3,378 18,345
Cash and cash equivalents, end of period 6,000 10,164
Cash received during the period for:    
Interest 17 193
Research & development tax credits 3,715 4,846
Cash paid during the period for:    
Taxes 2 2
Non cash financing activities:    
Accrual of preferred stock dividends $ 0 $ 50