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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities
The following tables show the Company’s available-for-sale securities’ adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category as of December 31, 2021 and 2020, respectively:
2021
Marketable Securities:Adjusted CostUnrealized GainsUnrealized LossesFair Value
Mutual and money market funds$78,331 $813 $(1,046)$78,098 
Corporate bonds16,478 94 (93)16,479 
Government securities - U.S.9,530 39 (98)9,471 
Other fixed-income securities2,473 2 (10)2,465 
Total$106,812 $948 $(1,247)$106,513 
2020
Marketable Securities:Adjusted CostUnrealized GainsUnrealized LossesFair Value
Mutual and money market funds$103,404 $1,288 $(20)$104,672 
Corporate bonds21,811 350 (6)22,155 
Government securities - U.S.18,849 155 (5)18,999 
Other fixed-income securities3,839 22 (7)3,854 
Total$147,903 $1,815 $(38)$149,680 
Investments Classified by Contractual Maturity Date
The following table summarizes the estimated fair value of the Company’s investments in marketable debt securities, accounted for as available-for-sale securities and classified by the contractual maturity date of the securities as of December 31, 2021:
Maturities
Marketable Debt Securities:Less than 1 Year1-5 Years5-10 YearsGreater than 10 YearsTotal
Corporate bonds$5,288 $10,873 $318 $— $16,479 
Government securities - U.S.1,531 5,938 807 1,195 9,471 
Other fixed-income securities— 1,860 605 — 2,465 
Total$6,819 $18,671 $1,730 $1,195 $28,415