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Investments (Tables) | 9 Months Ended
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Sep. 30, 2023
Investments [Abstract] |
Investments consists of available-for-sale securities | Investments consists of available-for-sale securities as follows (in thousands):
|  | September 30, 2023 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Estimated Fair Value |
Short-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 31,746 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | 31,737 |
Commercial paper |  |  | 3,222 |  |  |  | — |  |  |  | — |  |  |  | 3,222 |
Corporate bonds |  |  | 2,000 |  |  |  | — |  |  |  | — |  |  |  | 2,000 |
U.S. government agency debt securities |  |  | 13,123 |  |  |  | — |  |  |  | (2 | ) |  |  | 13,121 |
Total short-term marketable securities |  | $ | 50,091 |  |  | $ | — |  |  | $ | (11 | ) |  | $ | 50,080 |
|  | December 31, 2022 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Estimated Fair Value |
Short-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 30,628 |  |  | $ | — |  |  | $ | (177 | ) |  | $ | 30,451 |
Commercial paper |  |  | 29,543 |  |  |  | — |  |  |  | — |  |  |  | 29,543 |
Corporate bonds |  |  | 16,815 |  |  |  | — |  |  |  | (189 | ) |  |  | 16,626 |
U.S. government agency debt securities |  |  | 3,353 |  |  |  | 8 |  |  |  | — |  |  |  | 3,361 |
Total short-term marketable securities |  | $ | 80,339 |  |  | $ | 8 |  |  | $ | (366 | ) |  | $ | 79,981 |
Investments in a continual unrealized loss position | Investments in a continual unrealized loss position for less than 12 months consist of the following (in thousands):
|  | September 30, 2023 |  |  | December 31, 2022 |
|  | Fair Value |  |  | Fair Value |
U.S. Treasury securities |  | $ | 21,777 |  |  | $ | 26,506 |
Corporate bonds |  |  | — |  |  |  | 1,977 |
U.S. government agency debt securities |  |  | 7,924 |  |  |  | — |
Total available-for-sale securities |  | $ | 29,701 |  |  | $ | 28,483 |
Investments in a continual unrealized loss position for greater than 12 months consist of the following (in thousands):
|  | December 31, 2022 |
|  | Fair Value |
Corporate bonds |  | $ | 14,649 |
U.S. Treasury securities |  |  | 3,945 |
Total available-for-sale securities |  | $ | 18,594 |

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