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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2022
Investments Debt And Equity Securities [Abstract]  
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, 2021

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Available-for-sale securities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds and notes

 

$

1,434

 

 

$

8

 

 

$

(2

)

 

$

1,440

 

Municipal bonds

 

 

1,573

 

 

 

—

 

 

 

(3

)

 

 

1,570

 

Total available-for-sale securities

 

$

3,007

 

 

$

8

 

 

$

(5

)

 

$

3,010