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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (1,165) $ (5,678)
Adjustments to reconcile net loss to net cash used in operating activities:    
Change in fair value of derivative financial instruments (2,525) 516
Stock-based compensation expense 387 242
Unrealized foreign exchange (gain) loss (993) 110
Depreciation expense 10 0
Changes in operating assets and liabilities:    
Receivables 7 (350)
Prepaid expenses 94 86
Other assets (105) (18)
Accounts payable (886) 1,605
Accrued liabilities 316 623
Net cash used in operating activities (4,860) (2,864)
Cash flows from investing activities    
Purchase of property, plant & equipment (27) 0
Net cash used in investing activities (27) 0
Cash flows from financing activities:    
Proceeds from the issuance of common stock 0 9,187
Share issuance costs (73) (1,239)
Proceeds from the exercise of stock options and warrants 3,753 28
Net cash provided by financing activities 3,680 7,976
Effect of foreign exchange rate changes on cash 40 (115)
Net (decrease) increase in cash (1,167) 4,997
Cash at beginning of period 5,562 2,669
Cash at end of period $ 4,395 $ 7,666