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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2019
Marketable Securities  
Summary of marketable securities, classified as available-for-sale

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gross Unrealized

 

 

Amortized

 

 

 

 

 

 

 

Fair

 

    

Cost

    

Gains

    

Losses

    

Value

 

 

(In thousands)

March 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

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

 

$

17,641

 

$

 3

 

$

 —

 

$

17,644

Corporate debt securities (maturing in one year or less)

 

 

35,888

 

 

 4

 

 

(1)

 

 

35,891

Total Marketable Securities

 

$

53,529

 

$

 7

 

$

(1)

 

$

53,535

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31,2018

 

 

 

 

 

 

 

 

 

 

 

 

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

 

$

27,355

 

$

 —

 

$

(4)

 

$

27,351

Corporate debt securities (maturing in one year or less)

 

 

42,370

 

 

 —

 

 

(9)

 

 

42,361

Total Marketable Securities

 

$

69,725

 

$

 —

 

$

(13)

 

$

69,712