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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Measurements  
Schedule of fair value hierarchy

The carrying values of our assets that are required to be measured at fair value on a recurring basis as of September 30, 2021 and 2020 approximate fair value because of our ability to immediately convert these instruments into cash with minimal expected change in value which are classified in the table below in one of the three categories of the fair value hierarchy described above (in thousands):

    

Fair Value Measurements

    

Level 1

    

Level 2

    

Level 3

    

Total

September 30, 2021

 

  

 

  

 

  

 

  

Cash equivalents:

 

  

 

  

 

  

 

  

Money market mutual fund

$

14,384

$

$

$

14,384

Marketable equity securities:

 

  

 

  

 

  

 

  

Mutual funds

 

110,060

 

 

 

110,060

Available-for-sale debt securities:

 

 

  

 

  

 

U.S. Treasury notes and bills

 

153,377

 

 

 

153,377

Corporate debt securities

42,365

42,365

$

320,186

$

$

$

320,186

Fair Value Measurements 

    

Level 1

    

Level 2

    

Level 3

    

Total

December 31, 2020

Cash equivalents:

 

  

 

  

 

  

 

  

Money market mutual fund

$

11,820

$

$

$

11,820

Marketable equity securities:

 

  

 

  

 

  

 

  

Mutual funds

 

33,135

 

 

 

33,135

Available-for-sale debt securities:

 

  

 

  

 

  

 

  

U.S. Treasury notes

 

23,309

 

 

 

23,309

$

68,264

$

$

$

68,264