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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities:    
Net loss $ (3,625) $ (3,201)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 10 15
Gain on disposal of property and equipment (29)  
Stock-based compensation 178 167
Changes in lease liability (52)  
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (749) (860)
Accounts payable and other current liabilities (2,052) (63)
Net cash used in operating activities (6,319) (3,942)
Investing activities:    
Purchase of property, plant and equipment (3) (31)
Proceeds from sale of property and equipment 29  
Net cash provided by (used in) investing activities 26 (31)
Financing activities:    
Proceeds from issuance of common stock, net of issuance costs 4,056  
Payment of preferred stock dividend (101) (101)
Net cash provided by (used in) financing activities 3,955 (101)
Effect of exchange rate changes on cash and cash equivalents (7) (12)
Net (decrease) in cash and cash equivalents (2,345) (4,086)
Cash and cash equivalents, beginning of period 17,504 23,910
Cash and cash equivalents, end of period 15,159 19,824
Cash received during the period for:    
Interest 135 153
Taxes 0 0
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 $ 50