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Marketable Equity Securities (Tables)
3 Months Ended
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Marketable Equity Securities and Adjustments to Fair Value
(in thousands)

    March 31,

2019

 December 31,

2018

  Marketable equity securities at cost $1,714  $1,714 
  Cumulative unrealized loss on marketable equity securities (455)    (129)
  Marketable equity securities at fair value $1,259  $1,585 
Changes in Marketable Equity Securities
(in thousands) Three months ended
March 31,
  2019 2018
Gross (loss) recorded in the statement of operations $(326) $(441)
Change in marketable equity securities at fair value $(326) $(441)