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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities:    
Net loss $ (3,478) $ (1,220)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 9 5
Stock-based compensation 255 91
Changes in lease liability (13) (10)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (609) (874)
Accounts payable and other current liabilities 270 (799)
Net cash used in operating activities (3,566) (2,807)
Investing activities:    
Purchase of property, plant and equipment (78) (4)
Net cash used in investing activities (78) (4)
Financing activities:    
Proceeds from issuing common stock and warrant exercises, net of issuance costs 18,047  
Payment of preferred stock dividend (50) (50)
Net cash provided by (used in) financing activities 17,997 (50)
Effect of exchange rate changes on cash and cash equivalents 18 (101)
Net increase (decrease) in cash and cash equivalents 14,371 (2,962)
Cash and cash equivalents, beginning of period 33,406 11,885
Cash and cash equivalents, end of period 47,777 8,923
Supplemental cash flow information:    
Interest 5 28
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 $ 50