Capital Structure and Financial Risk and Related Items - Financial liabilities (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Categories of financial liabilities recognized | ||
| Transfers of financial liabilities from level 1 to 2 | $ 0 | |
| Transfers of financial liabilities from level 2 to 1 | 0 | |
| Transfers of financial liabilities into level 3 | 0 | |
| Transfers of financial liabilities from level 3 | 0 | |
| Financial liabilities at amortised cost | ||
| Categories of financial liabilities recognized | ||
| Financial liabilities | 1,203 | $ 2,073 |
| Financial liabilities, at fair value | 1,203 | 2,073 |
| Trade payables | Financial liabilities at amortised cost | ||
| Categories of financial liabilities recognized | ||
| Financial liabilities | 1,203 | 2,073 |
| Financial liabilities, at fair value | $ 1,203 | $ 2,073 |