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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2018
Marketable Securities  
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