Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accrued Liabilities
Employee bonuses	$ 820	$ 215
Accrued interest payable	571	451
Accrued restructuring costs	386
Accrued professional fees and other	245	186
Total accrued liabilities	$ 2,022	$ 852