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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating activities:    
Net loss $ (4,108) $ (3,478)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 9 9
Stock-based compensation 380 255
Changes in lease liability   (13)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (4,126) (609)
Accounts payable, accrued and other current liabilities 1,070 270
Net cash used in operating activities (6,775) (3,566)
Investing activities:    
Purchase of property, plant and equipment (4) (78)
Net cash used in investing activities (4) (78)
Financing activities:    
Proceeds, net of issuance costs, from issuing common stock and warrants   18,047
Payment of preferred stock dividend (50) (50)
Net cash (used in) provided by financing activities (50) 17,997
Effect of exchange rate changes on cash and cash equivalents (91) 18
Net (decrease) increase in cash and cash equivalents (6,920) 14,371
Cash and cash equivalents, beginning of period 36,559 33,406
Cash and cash equivalents, end of period 29,639 47,777
Supplemental cash flow information:    
Interest 4 5
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 $ 50