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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities:    
Net loss $ (8,605) $ (3,386)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 26 10
Stock-based compensation 533 176
Changes in lease liability 115 (70)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (476) (585)
Accounts payable and other current liabilities 626 (798)
Net cash used in operating activities (7,781) (4,653)
Investing activities:    
Purchase of property, plant and equipment (16) (4)
Net cash used in investing activities (16) (4)
Financing activities:    
Proceeds from issuing common stock and warrant exercises, net of issuance costs 18,047 18,307
Payment of preferred stock dividend (101) (101)
Net cash provided by (used in) financing activities 17,946 18,206
Effect of exchange rate changes on cash and cash equivalents 84 (92)
Net increase (decrease) in cash and cash equivalents 10,233 13,457
Cash and cash equivalents, beginning of period 33,406 11,885
Cash and cash equivalents, end of period 43,639 25,342
Supplemental cash flow information:    
Interest 9 32
Taxes 1,390 0
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 $ 50