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Marketable Securities
 3 Months Ended
Mar. 31, 2019
Marketable Securities  
Marketable Securities

(4) Marketable Securities

 

The following is a 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

 

The Company holds investment-grade marketable securities, and none were in a continuous unrealized loss position for more than twelve months as of March 31, 2019 and December 31, 2018. 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 $0.1 million in accrued interest at March 31, 2019 and December 31, 2018.