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Cash, Concentration of Credit Risk and Fair Value of Financial Instruments - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Assets: |  |  |  |
Total | $ 1,271,498 | $ 982,395 |  |
Amount included in cash and cash equivalents | 848,630 | 551,547 | $ 410,780 | $ 442,961
Commercial paper |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 71,271 | 78,870 |  |
U.S. government securities |  |  |  |
Assets: |  |  |  |
Securities | 234,542 | 230,561 |  |
Corporate bonds, asset backed and other securities |  |  |  |
Assets: |  |  |  |
Securities | 129,107 | 137,219 |  |
Money market and demand accounts |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 836,578 | 535,745 |  |
Commercial paper |  |  |  |
Assets: |  |  |  |
Amount included in cash and cash equivalents | 12,100 | 4,100 |  |
Corporate bonds, asset backed and other securities |  |  |  |
Assets: |  |  |  |
Amount included in cash and cash equivalents |  | 11,700 |  |
Level 1 |  |  |  |
Assets: |  |  |  |
Total | 836,578 | 535,745 |  |
Level 1 | Commercial paper |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Level 1 | U.S. government securities |  |  |  |
Assets: |  |  |  |
Securities | 0 | 0 |  |
Level 1 | Corporate bonds, asset backed and other securities |  |  |  |
Assets: |  |  |  |
Securities | 0 | 0 |  |
Level 1 | Money market and demand accounts |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 836,578 | 535,745 |  |
Level 2 |  |  |  |
Assets: |  |  |  |
Total | 434,920 | 446,650 |  |
Level 2 | Commercial paper |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 71,271 | 78,870 |  |
Level 2 | U.S. government securities |  |  |  |
Assets: |  |  |  |
Securities | 234,542 | 230,561 |  |
Level 2 | Corporate bonds, asset backed and other securities |  |  |  |
Assets: |  |  |  |
Securities | 129,107 | 137,219 |  |
Level 2 | Money market and demand accounts |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Level 3 |  |  |  |
Assets: |  |  |  |
Total | 0 | 0 |  |
Level 3 | Commercial paper |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Level 3 | U.S. government securities |  |  |  |
Assets: |  |  |  |
Securities | 0 | 0 |  |
Level 3 | Corporate bonds, asset backed and other securities |  |  |  |
Assets: |  |  |  |
Securities | 0 | 0 |  |
Level 3 | Money market and demand accounts |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | $ 0 | $ 0 |  |

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