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Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Investments |
Schedule of amortized cost and fair value of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Estimated
​ | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Fair Value
​ | ​ | (in thousands)
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
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | 63,331 | ​ | $ | — | ​ | $ | (482) | ​ | $ | 62,849
Government agency securities | ​ | ​ | 27,464 | ​ | ​ | — | ​ | ​ | (98) | ​ | ​ | 27,366
Corporate debt | ​ |  | 42,006 | ​ | ​ | — | ​ | ​ | (415) | ​ |  | 41,591
Commercial paper | ​ | ​ | 15,682 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15,682
Total | ​ | $ | 148,483 | ​ | $ | — | ​ | $ | (995) | ​ | $ | 147,488
Schedule of fair value and unrealized losses of available-for-sale securities in a loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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, 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)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | 39,791 | ​ | $ | (84) | ​ | $ | 23,057 | ​ | $ | (398)
Government agency securities | ​ | ​ | 22,528 | ​ | ​ | (86) | ​ | ​ | 4,838 | ​ | ​ | (12)
Corporate debt | ​ |  | 19,693 | ​ |  | (138) | ​ |  | 21,898 | ​ |  | (277)
Total | ​ | $ | 82,012 | ​ | $ | (308) | ​ | $ | 49,793 | ​ | $ | (687)
Schedule of contractual maturities of securities classified as available-for-sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | Amortized | ​ | Estimated
​ | ​ | Cost | ​ | Fair Value
​ | ​ | ​ | (in thousands)
Due in one year or less | ​ | $ | 132,419 | ​ | $ | 132,330
Due after one year through two years | ​ | ​ | 14,356 | ​ |  | 14,334
Total | ​ | $ | 146,775 | ​ | $ | 146,664

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