Other Current Liabilities (Schedule of Other Current Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Other Current Liabilities [Abstract]
Due to affiliate	$ 443	$ 9
Accrued professional fees	1,691	1,117
Pension and other postretirement liabilities	69	69
Accrued liabilities	59	84
Other current liabilities, total	$ 2,262	$ 1,279