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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities    
Net loss $ (28,623) $ (28,024)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 59 17
Change in fair value of derivative financial instruments 3,577 3,443
Stock-based compensation expense 8,095 1,818
Unrealized foreign exchange (gain) loss (1,711) 1,585
Changes in operating assets and liabilities:    
Receivables 429 (479)
Prepaid expenses (95) 186
Inventory (392) 0
Other assets (264) 0
Non-current receivables (294) 0
Account payable (1,087) 1,318
Accrued liabilities 685 811
Net cash used in operating activities (19,621) (19,325)
Cash flows from investing activities    
Purchase of property and equipment (440) (190)
Net cash used in investing activities (440) (190)
Cash flows from financing activities    
Proceeds from the issuances of common stock and warrants 38,526 20,878
Share issuance costs (3,161) (1,248)
Proceeds from the exercise of stock options and warrants 4,663 2,588
Net cash provided by financing activities 40,028 22,218
Effect of foreign exchange rate changes on cash 54 190
Net increase in cash 20,021 2,893
Cash at beginning of year 5,562 2,669
Cash at end of year 25,583 5,562
Supplemental disclosure of non-cash cash activities    
Cash paid for interest 0 0
Cash paid for income taxes 0 0
Supplemental schedule of non-cash investing and financing activities    
Share issuance costs included in accounts payable and accrued liabilities $ 52 $ 73