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Marketable Securities
 9 Months Ended
Sep. 30, 2019
Marketable Securities  
Marketable Securities

(4)  Marketable Securities

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gross Unrealized

 

 

Amortized

 

 

 

 

 

 

 

Fair

 

    

Cost

    

Gains

    

Losses

    

Value

 

 

(In thousands)

September 30, 2019

 

 

 

 

 

 

 

 

 

 

 

 

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

 

$

19,975

 

$

17

 

$

 —

 

$

19,992

Corporate debt securities (maturing in one year or less)

 

 

36,318

 

 

22

 

 

 —

 

 

36,340

Total Marketable Securities

 

$

56,293

 

$

39

 

$

 —

 

$

56,332

 

 

 

 

 

 

 

 

 

 

 

 

 

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 September 30, 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 $0.2 million and $0.1 million in accrued interest at September 30, 2019 and December 31, 2018, respectively.