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Investments
9 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Investments InvestmentsAs of September 30, 2023, the Company did not hold any investments in debt securities. As of December 31, 2022, all investments in debt securities were classified as available-for-sale investments. All investments were reported within current assets because the securities represent investments of cash available for current operations. As of December 31, 2022, the Company held $5.7 million of investments with contractual maturities of less than one year. As of December 31, 2022, the Company did not have any investments with contractual maturities between one and two years. Available-for-sale investments are recorded at fair value, and unrealized holding gains and losses are recorded as a component of other comprehensive income (loss).
The following table summarizes the Company’s available-for-sale investments:

As of December 31, 2022
Cost or Amortized CostGross Unrealized GainsGross Unrealized LossesTotal Estimated Fair Value
(In thousands)
Corporate bonds$3,216 $— $(24)$3,193 
Commercial paper582 — — 582 
Certificates of deposit1,884 — (9)1,875 
Total investments$5,682 $— $(33)$5,650 

Realized gains and losses on investments in debt securities for the three and nine months ended September 30, 2023 and 2022 were immaterial.