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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2021
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

 

June 30, 2021

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Available-for-sale securities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds and notes

 

$

1,007

 

 

$

19

 

 

$

—

 

$

1,026

 

Municipal bonds

 

 

969

 

 

 

2

 

 

 

—

 

 

 

971

 

Total available-for-sale securities

 

$

1,976

 

 

$

21

 

 

$

—

 

$

1,997

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

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

 

 

Amortized cost

 

 

Estimated fair value

 

Due within one year

 

$

959

 

 

$

969

 

Due after one year through five years

 

 

1,017

 

 

 

1,028

 

Due after five years

 

 

—

 

 

 

—

 

Total available-for-sale securities

 

$

1,976

 

 

$

1,997