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Cash, cash equivalents, and short-term marketable securities | 9 Months Ended
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Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Cash, cash equivalents, and short-term marketable securities | Cash, cash equivalents, and short-term marketable securities Cash and cash equivalents The following table summarizes the Company's cash, cash equivalents, and restricted cash as of September 30, 2024 and 2023.
| Nine Months Ended September 30, 2024 |  | Nine Months Ended September 30, 2023
(in thousands) | Beginning of period |  | End of period |  | Beginning of period |  | End of period
Cash and cash equivalents | $ | 174,561 |  |  | $ | 78,868 |  |  | $ | 128,885 |  |  | $ | 186,283 |
Restricted cash included in other assets, noncurrent | 478 |  |  | 478 |  |  | 478 |  |  | 478 |
Total cash, cash equivalents and restricted cash per statement of cash flows | $ | 175,039 |  |  | $ | 79,346 |  |  | $ | 129,363 |  |  | $ | 186,761 |
The restricted cash is held as a security deposit for a standby letter of credit related to the Company's facility lease. Marketable securities The following tables summarize the Company's marketable securities held at September 30, 2024 and December 31, 2023.
| September 30, 2024
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Marketable securities |  |  |  |  |  |  |
U.S. treasury securities | $ | 76,278 |  |  | $ | 26 |  |  | $ | (1) |  |  | $ | 76,303 |
| December 31, 2023
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Marketable securities |  |  |  |  |  |  |
U.S. treasury securities | $ | 29,535 |  |  | $ | 13 |  |  | $ | — |  |  | $ | 29,548 |
U.S. government agency securities | 4,977 |  |  | — |  |  | (2) |  |  | 4,975 |
Total | $ | 34,512 |  |  | $ | 13 |  |  | $ | (2) |  |  | $ | 34,523 |
All of the Company's marketable securities are due within one year or less. The Company did not realize any gains or losses recognized on the sale of marketable securities during the nine months ended September 30, 2024 and 2023, and as a result, the Company did not reclassify any amounts out of accumulated comprehensive loss. As of September 30, 2024, the Company's debt security portfolio consisted of 2 securities that were in an unrealized loss position and had an aggregate fair value of $17.7 million. There were no securities in an unrealized loss position for greater than 12 months as of September 30, 2024. The unrealized losses on the Company's marketable securities were caused by market interest rate increases. The Company has the intent and ability to hold such securities until recovery. As a result, the Company did not record any charges for credit-related impairments for any debt securities in its portfolio for the nine months ended September 30, 2024 and 2023.

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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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