| Fair Value Measurements |
Fair Value Measurements Assets and liabilities measured at fair value at each balance sheet date are as follows (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | June 30, 2026 | | Level 1 | | Level 2 | | Level 3 | | Total | Assets: | | | | | | | | | Cash equivalents: | | | | | | | | | Money market funds | $ | 148,024 | | | $ | — | | | $ | — | | | $ | 148,024 | | | | | | | | | | | | | | | | | | | Short-term marketable securities: | | | | | | | | | U.S. government treasuries | 408,829 | | | — | | | — | | | 408,829 | | | | | | | | | | | Corporate debt securities | — | | | 100,112 | | | — | | | 100,112 | | | | | | | | | | | Long-term marketable securities: | | | | | | | | | U.S. government treasuries | 163,401 | | | — | | | — | | | 163,401 | | | | | | | | | | | Corporate debt securities | — | | | 66,133 | | | — | | | 66,133 | | | Total | $ | 720,254 | | | $ | 166,245 | | | $ | — | | | $ | 886,499 | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2025 | | Level 1 | | Level 2 | | Level 3 | | Total | Assets: | | | | | | | | | Cash equivalents: | | | | | | | | | Money market funds | $ | 149,874 | | | $ | — | | | $ | — | | | $ | 149,874 | | | | | | | | | | | Commercial paper | — | | | 24,899 | | | — | | | 24,899 | | | Short-term marketable securities: | | | | | | | | | U.S. government treasuries | 600,084 | | | — | | | — | | | 600,084 | | | | | | | | | | | Corporate debt securities | — | | | 62,469 | | | — | | | 62,469 | | | | | | | | | | | Long-term marketable securities: | | | | | | | | | U.S. government treasuries | 58,545 | | | — | | | — | | | 58,545 | | | Corporate debt securities | — | | | 39,777 | | | — | | | 39,777 | | | | | | | | | | | Total | $ | 808,503 | | | $ | 127,145 | | | $ | — | | | $ | 935,648 | | | | | | | | | | | | | | | | | | | | | | | | | |
The Company’s Level 2 securities are valued using third-party pricing sources. The pricing services utilize industry standard valuation models, including both income and market-based approaches, for which all significant inputs are observable, either directly or indirectly. The Company has not transferred any assets or liabilities between the fair value measurement levels for the six months ended June 30, 2026 or for the year ended December 31, 2025.
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