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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2020
Marketable Securities  
Schedule of amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security

 

 

Amortized cost

 

 

Gross unrealized

holding gains

 

 

Gross unrealized

holding losses

 

 

Estimated fair value

 

December 31, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Available-for-sale securities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds and notes

 

$

1,312

 

 

 

26

 

 

 

—

 

 

1,338

 

Municipal bonds

 

 

1,536

 

 

 

5

 

 

 

—

 

 

1,541

 

Total available-for-sale securities

 

$

2,848

 

 

 

31

 

 

 

—

 

 

2,879

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Available-for-sale securities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds and notes

 

$

1,814

 

 

$

21

 

 

$

(3

)

 

$

1,832

 

Municipal bonds

 

 

2,707

 

 

 

5

 

 

 

(1

)

 

 

2,711

 

Total available-for-sale securities

 

$

4,521

 

 

$

26

 

 

$

(4

)

 

$

4,543

 

Schedule of maturities of marketable securities classified as available-for-sale securities

 

 

Amortized

 

 

Estimated

 

 

 

cost

 

 

fair value

 

 

 

 

 

 

 

 

 

 

Due within one year

 

$

1,106

 

 

 

1,117

 

Due after one year through five years

 

 

1,742

 

 

 

1,762

 

Total available-for-sale securities

 

$

2,848

 

 

 

2,879