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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2018
Marketable Securities  
Summary of marketable securities, classified as available-for-sale

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gross Unrealized

 

 

Amortized

 

 

 

 

 

 

 

Fair

 

    

Cost

    

Gains

    

Losses

    

Value

 

 

(In thousands)

September 30, 2018

 

 

 

 

 

 

 

 

 

 

 

 

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

 

$

22,318

 

$

 —

 

$

(7)

 

$

22,311

Corporate debt securities (maturing in one year or less)

 

 

50,491

 

 

 —

 

 

(7)

 

 

50,484

Total Marketable Securities

 

$

72,809

 

$

 —

 

$

(14)

 

$

72,795

 

 

 

 

 

 

 

 

 

 

 

 

 

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