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Cash Equivalents and Investments (Tables)
3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments

Investments held are all classified as current and at March 31, 2022 and December 31, 2021 are summarized as follows (in thousands):

 

 

 

March 31, 2022

 

 

December 31, 2021

 

Corporate securities

 

$

63,924

 

 

$

72,964

 

Municipal debt securities

 

 

12,629

 

 

 

13,215

 

U.S. Treasury securities

 

 

4,976

 

 

 

5,205

 

Certificates of deposit

 

 

4,300

 

 

 

4,404

 

Federal home loan securities

 

 

3,747

 

 

 

3,927

 

 

 

$

89,576

 

 

$

99,715