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Marketable Equity Securities (Tables)
9 Months Ended
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Marketable securities and adjustment to fair value
(in thousands)  

 September 30,

2019

   

 December 31,

2018

 
  Marketable equity securities at cost   $ 1,879     $ 1,714  
  Cumulative unrealized loss on marketable equity securities     (865 )     (129 )
  Marketable equity securities at fair value   $ 1,014     $ 1,585  
Changes in marketable securities
(in thousands)   Three months ended September 30,     Nine months ended September 30,  
    2019     2018     2019     2018  
 Purchase of Vendetta shares   $ 165     $ -     $ 165     $ -  
Gross (loss) recorded in the statement of operations     (347 )     (74 )     (736 )     (737 )
Change in marketable equity securities at fair value   $ (182 )   $ (74 )   $ (571 )   $ (737 )