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Cash Equivalents and Marketable Securities | 9 Months Ended
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Sep. 30, 2023
Cash and Cash Equivalents [Abstract] |
Cash Equivalents and Marketable Securities | Cash Equivalents and Marketable Securities Cash equivalents and marketable securities consisted of the following at September 30, 2023 (in thousands):
|  | Amortized Cost |  | Allowance for Credit Losses |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Cash equivalents and marketable securities: |  |  |  |  |  |  |  |  |  |
Government agency securities |  | $ | 171,404 |  |  | $ | — |  |  | $ | — |  |  | $ | (1,197) |  |  | $ | 170,207 |
U.S. Treasuries |  | 143,261 |  |  | — |  |  | 22 |  |  | (12) |  |  | 143,271 |
Money market funds |  | 82,537 |  |  | — |  |  | — |  |  | — |  |  | 82,537 |
Corporate notes/bonds |  | 38,066 |  |  | — |  |  | — |  |  | (254) |  |  | 37,812 |
Commercial paper |  | 12,598 |  |  | — |  |  | — |  |  | (11) |  |  | 12,587 |
Total |  | $ | 447,866 |  |  | $ | — |  |  | $ | 22 |  |  | $ | (1,474) |  |  | $ | 446,414 |
Cash equivalents and marketable securities consisted of the following at December 31, 2022 (in thousands):
|  | Amortized Cost |  | Allowance for Credit Losses |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Cash equivalents and marketable securities: |  |  |  |  |  |  |  |  |  |
Government agency securities |  | $ | 161,902 |  |  | $ | — |  |  | $ | 11 |  |  | $ | (2,556) |  |  | $ | 159,357 |
Money market funds |  | 141,522 |  |  | — |  |  | — |  |  | — |  |  | 141,522 |
Corporate notes/bonds |  | 57,575 |  |  | — |  |  | 2 |  |  | (694) |  |  | 56,883 |
U.S. Treasuries |  | 50,019 |  |  | — |  |  | 3 |  |  | (229) |  |  | 49,793 |
Commercial paper |  | 29,954 |  |  | — |  |  | 3 |  |  | (141) |  |  | 29,816 |
Total |  | $ | 440,972 |  |  | $ | — |  |  | $ | 19 |  |  | $ | (3,620) |  |  | $ | 437,371 |
As of September 30, 2023, the Company did not hold any marketable securities that had been in an unrealized loss position for more than twelve months. Furthermore, the Company has determined that there were no material changes in the credit risk of the securities. As of September 30, 2023, the Company holds 29 securities with an aggregate fair value of $96.8 million that had remaining maturities greater than one year. There were no realized gains or losses on available-for-sale securities during the nine months ended September 30, 2023 or 2022.

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent + Details
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