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Marketable Securities | 3 Months Ended
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Mar. 31, 2023
Marketable Securities [Abstract] |
Marketable Securities | 4. Marketable Securities Available-for-sale marketable securities were as follows (in thousands):
| March 31, 2023 |
| Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Commercial paper | $ | 158,883 |  |  | $ | — |  |  | $ | — |  |  | $ | 158,883 |
Corporate debt |  | 21,197 |  |  |  | — |  |  |  | (42 | ) |  |  | 21,155 |
Government agency |  | 78,535 |  |  |  | 184 |  |  |  | (56 | ) |  |  | 78,663 |
Total | $ | 258,615 |  |  | $ | 184 |  |  | $ | (98 | ) |  | $ | 258,701 |
| December 31, 2022 |
| Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Commercial paper | $ | 129,810 |  |  | $ | — |  |  | $ | — |  |  | $ | 129,810 |
Corporate debt |  | 11,923 |  |  |  | — |  |  |  | (57 | ) |  |  | 11,866 |
U.S. government agency |  | 49,144 |  |  |  | 9 |  |  |  | (173 | ) |  |  | 48,980 |
Total | $ | 190,877 |  |  | $ | 9 |  |  | $ | (230 | ) |  | $ | 190,656 |
All of the Company’s available-for-sale debt marketable securities held as of March 31, 2023 had contractual matu rities of less than one year. The Company had 6 securities in an unrealized loss position with an aggregate related fair value of $33.2 million as of March 31, 2023. All securities in an unrealized loss position as of March 31, 2023 had been in a loss position for less than 12 months. Unrealized losses on available-for-sale marketable securities as of March 31, 2023 were not significant and were primarily due to changes in interest rates, including market credit spreads, and not due to increased credit risks associated with specific securities. Accordingly, no allowance for credit losses related to the Company’s available-for-sale marketable securities was recorded for the three months ended March 31, 2023. The Company does not intend to sell these securities or expect to be required to sell the investments before recov ery of their amortized cost bases, which may be at maturity.

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