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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating activities:    
Net loss $ (8,445) $ (7,830)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 20 20
Gain on disposal of property and equipment   (38)
Stock-based compensation 430 466
Changes in lease liability (93) (71)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 124 214
Accounts payable and other current liabilities 30 (2,208)
Net cash used in operating activities (7,934) (9,447)
Investing activities:    
Purchase of property, plant and equipment (96) (10)
Proceeds from sale of property and equipment   38
Net cash provided by (used in) investing activities (96) 28
Financing activities:    
Proceeds from issuing common stock, preferred stock and pre-funded warrants, net of issuance costs 29,705 4,049
Payment of preferred stock dividend (201) (201)
Net cash provided by financing activities 29,504 3,848
Effect of exchange rate changes on cash and cash equivalents 47 (48)
Net increase in cash and cash equivalents 21,521 (5,619)
Cash and cash equivalents, beginning of period 11,885 17,504
Cash and cash equivalents, end of period 33,406 11,885
Supplemental cash flow information:    
Cash received during the period for: Interest 42 224
Cash received during the period for: Taxes 1,291 1,163
Lease liability   (1,505)
Right-of-use asset   1,385
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 $ 50