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Marketable Securities
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
The following is a summary of available-for-sale and held-to-maturity securities as of December 31, 2023 (in thousands):
Amortized CostGross Unrealized GainGross Unrealized (Losses)Estimated Fair Value
Available-for-sale securities:
Tax-exempt municipal securities$10,055 $2 $(144)$9,913 
Corporate debt securities3,202 — (79)3,123 
Total available-for-sale securities$13,257 $2 $(223)$13,036 
Held-to-maturity securities:
Term deposits$27,175 $— $— $27,175 
The following is a summary of available-for-sale securities as of December 31, 2022 (in thousands):
Amortized CostGross Unrealized GainGross Unrealized (Losses)Estimated Fair Value
Available-for-sale securities:
Tax-exempt municipal securities$15,852 $2 $(507)$15,347 
Corporate debt securities7,140 — (208)6,932 
Total$22,992 $2 $(715)$22,279 
The Company had no held-to-maturity securities as of December 31, 2022.
The unrealized gains and losses on the Company’s investments in corporate debt and municipal securities as of December 31, 2022 and 2023 were caused by changes in market values primarily due to interest rate changes. As of December 31, 2023, the fair value of the Company’s securities which were in an unrealized loss position for a period longer than twelve months was $12.0 million. The Company does not intend to sell these securities, and it is not more likely than not that the Company will be required to sell these securities prior to the recovery of their amortized cost basis, which may be at maturity. As such, no impairment charges were recorded during the years ended December 31, 2021, 2022, and 2023. The Company has no allowance for credit losses related to its available-for-sale or held-to-maturity securities as all investments are in investment grade securities.
The following table summarizes the maturities of the Company’s marketable securities as of December 31, 2022 and 2023 (in thousands):
 December 31, 2022December 31, 2023
Available-for-sale securitiesHeld-to-maturity securitiesAvailable-for-sale securitiesHeld-to-maturity securities
Due within one year$9,156 $— $12,553 $27,175 
Due after one year through three years13,123 — 483 — 
Total$22,279 $— $13,036 $27,175 
The following table summarizes the proceeds from the maturities and sales of available-for-sale securities for the years ended December 31, 2021, 2022, and 2023 (in thousands):
 December 31, 2021December 31, 2022December 31, 2023
Maturities of marketable securities$7,495 $6,420 $9,800 
Sales of marketable securities1,805 — — 
Total$9,300 $6,420 $9,800 
The Company recorded approximately $0.8 million in gross realized losses in net income during the year ended December 31, 2021 related to the sale of marketable securities. The Company did not record any gross realized gains or losses in net income during the years ended December 31, 2022 and 2023.