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Investments
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Investments
Investments

The value of marketable investments were as follows (in thousands):
December 31, 2017
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Carrying Value
Debt securities: corporate bonds
$
700

 
$
6

 
$
(22
)
 
$
684

Marketable equity securities
513

 
710

 
(5
)
 
1,218

Total
$
1,213

 
$
716

 
$
(27
)
 
$
1,902



Debt Securities

At December 31, 2017, there were no material unrealized losses on any debt security. There were no impairment losses recorded on debt securities during the three or nine months ended September 30, 2018 or 2017.

Marketable Equity Securities

No material impairment losses were recorded on any marketable equity securities during the three or nine months ended September 30, 2018 and 2017.