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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating activities:    
Net loss $ (5,804) $ (4,108)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 8 9
Stock-based compensation 401 380
Changes in lease liability (26) (15)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (1,234) (4,126)
Accounts payable, accrued and other current liabilities (206) 1,085
Net cash used in operating activities (6,861) (6,775)
Investing activities:    
Purchase of property, plant and equipment (6) (4)
Net cash used in investing activities (6) (4)
Financing activities:    
Payment of preferred stock dividend (50) (50)
Net cash provided by financing activities (50) (50)
Effect of exchange rate changes on cash and cash equivalents 7 (91)
Net (decrease) increase in cash and cash equivalents (6,910) (6,920)
Cash and cash equivalents, beginning of period 18,345 36,559
Cash and cash equivalents, end of period 11,435 29,639
Cash received during the period for:    
Interest 116 4
Cash paid during the period for:    
Taxes 2  
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 $ 50