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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Operating activities:    
Net loss $ (5,525) $ (5,270)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 15 22
Gain on disposal of property and equipment (29)  
Stock-based compensation 361 255
Changes in lease liability (61)  
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (676) 320
Accounts payable and other current liabilities (2,415) 8
Net cash used in operating activities (8,330) (4,665)
Investing activities:    
Purchase of property, plant and equipment (7) (33)
Proceeds from sale of property and equipment 29  
Net cash provided by (used in) investing activities 22 (33)
Financing activities:    
Proceeds from issuance of common stock, net of issuance costs 4,049  
Payment of preferred stock dividend (151) (151)
Net cash provided by (used in) financing activities 3,898 (151)
Effect of exchange rate changes on cash and cash equivalents (126) (88)
Net (decrease) in cash and cash equivalents (4,536) (4,937)
Cash and cash equivalents at beginning of period 17,504 23,910
Cash and cash equivalents at end of period 12,968 18,973
Supplemental cash flow information:    
Cash received during the period for: Interest 177 238
Cash received during the period for: Taxes   1,158
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 $ 50