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Short-Term Investments | 3 Months Ended
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Mar. 31, 2024
Short-Term Investments [Abstract] |
Short-Term Investments | 5. Short-Term Investments The following is a summary of our short-term investments (in thousands):
|  | March 31, 2024 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. Treasury bills and government agency obligations |  | $ | 40,533 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 40,527 |
U.S. corporate debt securities |  |  | 6,298 |  |  |  | — |  |  |  | (1 | ) |  |  | 6,297 |
Foreign corporate debt securities |  |  | 4,249 |  |  |  | 1 |  |  |  | — |  |  |  | 4,250 |
U.S. commercial paper |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Foreign commercial paper |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 51,080 |  |  | $ | 1 |  |  | $ | (7 | ) |  | $ | 51,074 |
|  | December 31, 2023 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. Treasury bills and government agency obligations |  | $ | 31,625 |  |  | $ | 11 |  |  | $ | — |  |  | $ | 31,636 |
U.S. corporate debt securities |  |  | 11,652 |  |  |  | 1 |  |  |  | — |  |  |  | 11,653 |
Foreign corporate debt securities |  |  | 5,459 |  |  |  | 1 |  |  |  | — |  |  |  | 5,460 |
U.S. commercial paper |  |  | 1,991 |  |  |  | — |  |  |  | (1 | ) |  |  | 1,990 |
Foreign commercial paper |  |  | 993 |  |  |  | — |  |  |  | — |  |  |  | 993 |
Total |  | $ | 51,720 |  |  | $ | 13 |  |  | $ | (1 | ) |  | $ | 51,732 |
The amortized cost of debt securities is adjusted for amortization of premiums and accretion of discounts to maturity. We regularly monitor and evaluate the realizable value of our marketable securities. We did no t recognize any impairment losses during the three months ended March 31, 2024 and 2023. Unrealized gains and losses associated with our investments are reported in accumulated other comprehensive income (loss). Realized gains and losses associated with our investments, if any, are reported in the statements of operations and comprehensive loss. We did no t recognize any realized gains or losses during the three months ended March 31, 2024 or March 31, 2023.

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