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Investments | 12 Months Ended
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Dec. 31, 2024
Investments |
Investments | Note 4 — Investments ​ At December 31, 2024 and 2023 the amortized cost and fair value of marketable securities, which are included in “Short-term investments” on the Consolidated Balance Sheets, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Estimated
​ | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Fair Value
​ | ​ | (in thousands)
December 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | 84,008 | ​ | $ | 45 | ​ | $ | (21) | ​ | $ | 84,032
Government agency securities | ​ | ​ | 30,244 | ​ | ​ | 13 | ​ | ​ | (90) | ​ | ​ | 30,167
Corporate debt | ​ | ​ | 83,209 | ​ | ​ | 17 | ​ | ​ | (175) | ​ | ​ | 83,051
Commercial paper | ​ | ​ | 1,469 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,469
Total | ​ | $ | 198,930 | ​ | $ | 75 | ​ | $ | (286) | ​ | $ | 198,719
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | 59,541 | ​ | $ | 3 | ​ | $ | (51) | ​ | $ | 59,493
Government agency securities | ​ | ​ | 41,843 | ​ | ​ | 6 | ​ | ​ | (31) | ​ | ​ | 41,818
Corporate debt | ​ |  | 35,447 | ​ | ​ | 9 | ​ | ​ | (47) | ​ |  | 35,409
Commercial paper | ​ | ​ | 9,944 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 9,944
Total | ​ | $ | 146,775 | ​ | $ | 18 | ​ | $ | (129) | ​ | $ | 146,664
​ Available-for-sale securities in a loss position at December 31, 2024 and 2023 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Continuous Loss Position | ​ | Continuous Loss Position
​ | ​ | for Less than 12 Months | ​ | for 12 Months or More
​ |  | ​ | ​ |  | Gross |  | ​ | ​ |  | Gross
​ | ​ | Estimated | ​ | Unrealized | ​ | Estimated | ​ | Unrealized
​ | ​ | Fair Value | ​ | Losses | ​ | Fair Value | ​ | Losses
​ | ​ | ​ | (in thousands)
December 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | 26,756 | ​ | $ | (21) | ​ | $ | — | ​ | $ | —
Government agency securities | ​ | ​ | 20,062 | ​ | ​ | (90) | ​ | ​ | — | ​ | ​ | —
Corporate debt | ​ |  | 58,967 | ​ |  | (175) | ​ |  | — | ​ |  | —
Total | ​ | $ | 105,785 | ​ | $ | (286) | ​ | $ | — | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | 43,118 | ​ | $ | (50) | ​ | $ | — | ​ | $ | —
Government agency securities | ​ | ​ | 34,885 | ​ | ​ | (31) | ​ | ​ | — | ​ | ​ | —
Corporate debt | ​ |  | 23,262 | ​ |  | (33) | ​ |  | 2,618 | ​ |  | (15)
Total | ​ | $ | 101,265 | ​ | $ | (114) | ​ | $ | 2,618 | ​ | $ | (15)
​ The contractual maturities of securities classified as available-for-sale at December 31, 2024 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | Amortized | ​ | Estimated
​ | ​ | Cost | ​ | Fair Value
​ | ​ | ​ | (in thousands)
Due in one year or less | ​ | $ | 143,688 | ​ | $ | 143,696
Due after one year through two years | ​ | ​ | 55,242 | ​ |  | 55,023
Total | ​ | $ | 198,930 | ​ | $ | 198,719
​ Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The realized gains or losses for the years ended December 31, 2024, 2023, and 2022 were immaterial.

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