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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities:    
Net loss $ (3,201) $ (3,742)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 15 17
Stock-based compensation 167 135
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (860) 746
Accounts payable and other current liabilities (63) (1,167)
Net cash used in operating activities (3,942) (4,011)
Investing activities:    
Purchase of property, plant and equipment (31) (2)
Net cash used in investing activities (31) (2)
Financing activities:    
Proceeds from issuance of common stock, net of issuance costs   1,063
Payment of preferred stock dividend (101) (101)
Net cash used in financing activities (101) 962
Effect of exchange rate changes on cash and cash equivalents 12 122
Net (decrease) in cash and cash equivalents (4,086) (2,929)
Cash and cash equivalents, beginning of period 23,910 16,520
Cash and cash equivalents, end of period 19,824 13,591
Cash received during the period for:    
Interest 153 30
Taxes   1,815
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 $ 50