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Other Current Liabilities (Tables)
 6 Months Ended
Jun. 30, 2019
Other Current Liabilities [Abstract]  
Schedule of Other Current Liabilities

Other current liabilities consists of (in thousands):

 

 

 

 

 

 

 

June 30,

 

December 31,

 

2019

 

2018

Operating lease liability, current

$

677

 

$

         —

Due to affiliate

 

 3

 

 

164

Accrued professional fees

 

805

 

 

1,206

Pension and other postretirement liabilities

 

69

 

 

69

Accrued liabilities

 

51

 

 

56

 

$

1,605

 

$

1,495