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Cash Equivalents and Investments (Tables)
6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
Investments held at June 30, 2020 and December 31, 2019 are summarized as follows (in thousands):
 
    
June 30, 2020
    
December 31, 2019
 
Corporate securities
   $ 55,677      $ 32,962  
Municipal debt securities
     20,831        29,066  
Federal home loan securities
     8,537        8,013  
Certificates of deposit
     5,597        4,469  
  
 
 
    
 
 
 
   $ 90,642      $ 74,510