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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Operating activities:    
Net loss $ (8,683) $ (8,605)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 17 26
Stock-based compensation 730 533
Changes in lease liability 0 115
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (926) (476)
Accounts payable, accrued and other current liabilities 172 626
Net cash used in operating activities (8,690) (7,781)
Investing activities:    
Purchase of property, plant and equipment (7) (16)
Net cash used in investing activities (7) (16)
Financing activities:    
Proceeds, net of issuance costs, from issuing common stock and warrants 1,525 18,047
Payment of preferred stock dividend (101) (101)
Net cash (used in) provided by financing activities 1,424 17,946
Effect of exchange rate changes on cash and cash equivalents (209) 84
Net (decrease) increase in cash and cash equivalents (7,482) 10,233
Cash and cash equivalents, beginning of period 36,559 33,406
Cash and cash equivalents, end of period 29,077 43,639
Supplemental cash flow information:    
Interest 21 9
Research & Development Tax Credits 3,328 1,390
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 $ 50