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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Operating activities:    
Net loss $ (21,198) $ (18,887)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 32 43
Stock-based compensation 1,506 1,157
Changes in lease liability 40 172
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (3,784) (3,931)
Accounts payable, accrued and other current liabilities 2,577 2,906
Net cash used in operating activities (20,827) (18,540)
Investing activities:    
Purchase of property, plant and equipment (7) (27)
Net cash used in investing activities (7) (27)
Financing activities:    
Proceeds, net of issuance costs, from issuing common stock and warrants 3,199 17,371
Proceeds from the exercise of stock options and warrants, net of issuance costs   4,567
Payment of preferred stock dividend (201) (201)
Net cash provided by financing activities 2,998 21,737
Effect of exchange rate changes on cash and cash equivalents (378) (17)
Net (decrease) increase in cash and cash equivalents (18,214) 3,153
Cash and cash equivalents, beginning of period 36,559 33,406
Cash and cash equivalents, end of period 18,345 36,559
Supplemental cash flow information:    
Interest 211 17
Research & Development Tax Credits 3,312 1,358
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 $ 50