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Financial Instruments | 12 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Financial Instruments | 6.Financial Instruments The following table shows the Company’s cash, cash equivalents and marketable debt securities by significant investment category as of December 31, 2024:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Current |  | Noncurrent
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​ | Cash and Cash | ​ | Marketable | ​ | Marketable
​ | ​ | Cost (1) | ​ | Gains | ​ | Losses | ​ | Value | ​ | Equivalents | ​ | Securities | ​ | Securities
Cash |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 3,020 |  | $ | — |  | $ | —
Level 1: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Money market funds |  | ​ | — |  | ​ | — |  | ​ | — |  | ​ | — |  | ​ | 94,112 |  | ​ | — |  | ​ | —
U.S. Treasury securities |  | ​ | 156,040 |  | ​ | 1,688 |  | ​ | (6) |  | ​ | 157,722 |  | ​ | — |  | ​ | 110,249 |  | ​ | 47,473
Subtotal |  | ​ | 156,040 |  | ​ | 1,688 |  | ​ | (6) |  | ​ | 157,722 |  | ​ | 94,112 |  | ​ | 110,249 |  | ​ | 47,473
Level 2 (2): |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Commercial paper |  | ​ | 19,902 |  | ​ | 531 |  | ​ | — |  | ​ | 20,433 |  | ​ | — |  | ​ | 20,433 |  | ​ | —
Total | ​ | $ | 175,942 | ​ | $ | 2,219 | ​ | $ | (6) | ​ | $ | 178,155 | ​ | $ | 97,132 | ​ | $ | 130,682 | ​ | $ | 47,473
(1) | There was no allowance for expected credit losses on available-for-sale debt securities as of December 31, 2024 as the unrealized losses were deemed to be temporary in nature.
(2) | The valuation techniques used to measure the fair values of the Company’s Level 2 financial instruments, which generally have counterparties with high credit ratings, are based on quoted market prices or model-driven valuations using significant inputs derived from or corroborated by observable market data.
The following table shows the fair value of the Company’s noncurrent marketable debt securities, by contractual maturity, as of December 31, 2024:
​ | ​ | ​ | ​
Due within 1 year |  | $ | 130,682
Due after 1 year through 5 years | ​ |  | 47,473
Total fair value | ​ | $ | 178,155
​ As of December 31, 2023, the Company’s cash and cash equivalents were $9,868.

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