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Marketable Securities
 3 Months Ended
Mar. 31, 2021
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)

March 31, 2021

 

 

 

 

 

 

 

 

 

 

 

 

Marketable securities

 

 

 

 

 

 

 

 

 

 

 

 

U.S. government and municipal obligations

 

 

 

 

 

 

 

 

 

 

 

 

Maturing in one year or less

 

$

16,338

 

$

 4

 

$

 —

 

$

16,342

Maturing after one year through three years

 

 

8,178

 

 

 2

 

 

 —

 

 

8,180

Total U.S. government and municipal obligations

 

$

24,516

 

$

 6

 

$

 —

 

$

24,522

Corporate debt securities

 

 

 

 

 

 

 

 

 

 

 

 

Maturing in one year or less

 

$

82,263

 

$

 —

 

$

(15)

 

$

82,248

Maturing after one year through three years

 

 

 —

 

 

 —

 

 

 —

 

 

 —

Total corporate debt securities

 

$

82,263

 

$

 —

 

$

(15)

 

$

82,248

Total marketable securities

 

$

106,779

 

$

 6

 

$

(15)

 

$

106,770

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2020

 

 

 

 

 

 

 

 

 

 

 

 

Marketable securities

 

 

 

 

 

 

 

 

 

 

 

 

U.S. government and municipal obligations

 

 

 

 

 

 

 

 

 

 

 

 

Maturing in one year or less

 

$

40,328

 

$

 3

 

$

(2)

 

$

40,329

Maturing after one year through three years

 

 

 —

 

 

 —

 

 

 —

 

 

 —

Total U.S. government and municipal obligations

 

$

40,328

 

$

 3

 

$

(2)

 

$

40,329

Corporate debt securities

 

 

 

 

 

 

 

 

 

 

 

 

Maturing in one year or less

 

$

110,265

 

$

 2

 

$

(10)

 

$

110,257

Maturing after one year through three years

 

 

 —

 

 

 —

 

 

 —

 

 

 —

Total corporate debt securities

 

$

110,265

 

$

 2

 

$

(10)

 

$

110,257

Total marketable securities

 

$

150,593

 

$

 5

 

$

(12)

 

$

150,586

 

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, 2021 and December 31, 2020. 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 $0.4 million and $0.2 million in accrued interest at March 31, 2021 and December 31, 2020, respectively.