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Cash Equivalents and Investments (Tables)
9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments

Investments held, all of which are classified as current assets, at September 30, 2021 and December 31, 2020 are summarized as follows (in thousands):

 

 

 

September 30, 2021

 

 

December 31, 2020

 

Corporate securities

 

$

72,532

 

 

$

71,095

 

Municipal debt securities

 

 

12,307

 

 

 

18,707

 

U.S. Treasury securities

 

 

5,267

 

 

 

1,060

 

Certificates of deposit

 

 

4,436

 

 

 

5,991

 

Federal home loan securities

 

 

3,968

 

 

 

8,017

 

 

 

$

98,510

 

 

$

104,870