Operating Assets and Liabilities - Accrued liabilities (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Operating Assets and Liabilities | ||
| Accrued amounts due in accordance with the Amendment (Note 3.4) | $ 11,757 | |
| Professional advisors | 910 | $ 4,042 |
| Contract research and manufacturing organizations | 77 | 715 |
| Other | 299 | 310 |
| Total | $ 13,043 | $ 5,067 |