Investments

The value of marketable investments were as follows (in thousands):



March 31, 2018	Fair Value
Debt securities: corporate bonds	$	654
Marketable equity securities	1,259
Total	$	1,913



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

The Company owns certain corporate bonds which were purchased based on the maturity and yield-to-maturity of the bond and an analysis of the fundamental characteristics of the issuer. At March 31, 2018 and December 31, 2017, there were no material unrealized losses on such securities. There were no impairment losses recorded on debt securities during the three months ended March 31, 2018 or 2017.

Marketable Equity Securities

At March 31, 2018, the Company reviewed its equity securities in an unrealized loss position and concluded that the securities in a loss position were not other-than-temporarily impaired as the declines were not of sufficient duration and severity, and publicly-available financial information, collectively, did not indicate impairment. The primary cause of the losses on those securities was normal market volatility. No material impairment losses were recorded during the three months ended March 31, 2018 and 2017.