| Fair value measurements |
3. Fair value measurements Assets and liabilities measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023 are as follows: | | | | | | | | | | | | | | | | | | | Quoted Prices | | Significant | | | | | | | | | | in Active | | Other | | Significant | | | | | | | Markets for | | Observable | | Unobservable | | | | | | | Identical Assets | | Inputs | | Inputs | | Assets | | Total | | (Level 1) | | (Level 2) | | (Level 3) | | | March 31, 2024 | | (in thousands) | | Money market funds included in cash and cash equivalents | | $ | 49,444 | | $ | 49,444 | | $ | — | | $ | — | | Marketable securities: | | | | | | | | | | | | | | U.S. Treasury notes | | | 24,486 | | | 24,486 | | | — | | | — | | U.S. Government agency securities | | | 138,191 | | | 138,191 | | | — | | | — | | Corporate bonds | | | 88,983 | | | — | | | 88,983 | | | — | | Commercial paper | | | 4,830 | | | — | | | 4,830 | | | — | | Total money market funds and marketable securities | | $ | 305,934 | | $ | 212,121 | | $ | 93,813 | | $ | — | | December 31, 2023 | | | | | | | | | | | | | | Money market funds included in cash and cash equivalents | | $ | 65,589 | | $ | 65,589 | | $ | — | | $ | — | | Marketable securities: | | | | | | | | | | | | | | U.S. Treasury notes | | | 103,044 | | | 103,044 | | | — | | | — | | U.S. Government agency securities | | | 31,075 | | | 31,075 | | | — | | | — | | Corporate bonds | | | 23,970 | | | — | | | 23,970 | | | — | | Commercial paper | | | 3,985 | | | — | | | 3,985 | | | — | | Total money market funds and marketable securities | | $ | 227,663 | | $ | 199,708 | | $ | 27,955 | | $ | — | |
The Company measures the fair value of money market funds, U.S. Treasury notes, and U.S. Government agency securities based on quoted prices in active markets for identical securities. The Company measures the fair value of the Level 2 securities, corporate bonds and commercial paper, based on recent trades of securities in active markets or based on quoted market prices of similar instruments and other significant inputs derived from or corroborated by observable market data.
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