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Marketable Securities
 3 Months Ended
Mar. 31, 2018
Marketable Securities  
Marketable Securities

 

(5)  Marketable Securities

 

The following is a summary of marketable securities, classified as available-for-sale:

 

 

 

Gross Unrealized

 

 

 

Amortized
Cost

 

Gains

 

Losses

 

Fair
Value

 

 

 

(In thousands)

 

March 31, 2018

 

 

 

 

 

 

 

 

 

U.S. government and municipal obligations (maturing in one year or less)

 

$
24,150

 

$
2

 

$
(7

)

$
24,145

 

Corporate debt securities (maturing in one year or less)

 
59,311

 

—

 
(32

)

$
59,279

 

 

 

 

 

 

 

 

 

 

 

 

Total Marketable Securities

 

$
83,461

 

$
2

 

$
(39

)

$
83,424

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2017

 

 

 

 

 

 

 

 

 

U.S. government and municipal obligations (maturing in one year or less)

 

$
26,164

 

$
3

 

$
(9

)

$
26,158

 

Corporate debt securities (maturing in one year or less)

 
73,007

 
1

 
(27

)
72,981

 

 

 

 

 

 

 

 

 

 

 

Total Marketable Securities

 

$
99,171

 

$
4

 

$
(36

)

$
99,139

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The Company holds investment-grade marketable securities, and none were in a continuous unrealized loss position for more than 12 months as of March 31, 2018 and December 31, 2017. The unrealized losses are attributable to changes in interest rates and the Company does not believe any unrealized losses represent other-than-temporary impairments.

 

Marketable securities include $0.2 million and $0.3 million in accrued interest at March 31, 2018 and December 31, 2017, respectively.