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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating activities:    
Net loss $ (5,599) $ (8,952)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 25 109
Stock-based compensation 200 614
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 1,464 629
Accounts payable and other current liabilities (1,350) 464
Net cash used in operating activities (5,260) (7,136)
Investing activities:    
Purchase of property, plant and equipment (11)  
Net cash used in investing activities (11)  
Financing activities:    
Proceeds from issuance of common stock, net of issuance costs 14,751 5,241
Payment of preferred stock dividend (151) (150)
Net cash provided by financing activities 14,600 5,091
Effect of exchange rate changes on cash and cash equivalents 176 (366)
Net increase / (decrease) in cash and cash equivalents 9,505 (2,411)
Cash and cash equivalents, beginning of period 16,520  
Cash and cash equivalents, end of period 26,025 18,029
Cash received during the period for:    
Interest 60 31
Taxes 1,815 1,965
Non cash financing activities:    
Accrual of preferred stock dividends $ 50 50
Receivable from issuance of common stock   $ 1,518