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Other Current Liabilities (Schedule of Other Current Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other Current Liabilities [Abstract]    
Operating lease liability, current $ 513  
Operating Lease, Liability, Statement of Financial Position [Extensible List] Liabilities Current  
Due to affiliate $ 9 $ 164
Accrued professional fees 1,142 1,206
Pension and other postretirement liabilities 69 69
Accrued liabilities 58 56
Other current liabilities, total $ 1,791 $ 1,495