Accounting policies (Schedule of Changes in Financial Liabilities) (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Balance, beginning | $ 0 | $ 2,169 |
| Change in fair value of warrant derivative liability | 150 | |
| Interest expenses on convertible notes | 5 | |
| Conversion of convertible notes | (3,674) | |
| Change In Financial Liabilities Issuance Of Warrants | 530 | |
| Change in fair value of convertible notes | 1,500 | |
| Balance, ending | $ 680 | $ 0 |