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Fair Value Measurements, Cash Equivalents and Marketable Securities - Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financial Assets: |  |
Cash equivalents | $ 613,039 | $ 1,032,500
Short-term marketable debt securities | 310,701 | 35,097
Short-term marketable equity securities | 31,280 |
Long-term marketable equity securities |  | 98,002
Total financial assets | 955,020 | 1,165,599
Financial Liabilities: |  |
Contingent consideration | 7,300 | 6,540
Total financial liabilities | 7,300 | 6,540
Level 1 |  |
Financial Assets: |  |
Cash equivalents | 112,142 | 1,032,500
Short-term marketable debt securities | 0 | 0
Short-term marketable equity securities | 31,280 |
Long-term marketable equity securities |  | 98,002
Total financial assets | 143,422 | 1,130,502
Financial Liabilities: |  |
Contingent consideration | 0 | 0
Total financial liabilities | 0 | 0
Level 2 |  |
Financial Assets: |  |
Cash equivalents | 500,897 | 0
Short-term marketable debt securities | 310,701 | 35,097
Short-term marketable equity securities | 0 |
Long-term marketable equity securities |  | 0
Total financial assets | 811,598 | 35,097
Financial Liabilities: |  |
Contingent consideration | 0 | 0
Total financial liabilities | 0 | 0
Level 3 |  |
Financial Assets: |  |
Cash equivalents | 0 | 0
Short-term marketable debt securities | 0 | 0
Short-term marketable equity securities | 0 |
Long-term marketable equity securities |  | 0
Total financial assets | 0 | 0
Financial Liabilities: |  |
Contingent consideration | 7,300 | 6,540
Total financial liabilities | 7,300 | 6,540
U.S. government debt securities |  |
Financial Assets: |  |
Short-term marketable debt securities | 310,701 | 35,097
U.S. government debt securities | Level 1 |  |
Financial Assets: |  |
Short-term marketable debt securities | 0 | 0
U.S. government debt securities | Level 2 |  |
Financial Assets: |  |
Short-term marketable debt securities | 310,701 | 35,097
U.S. government debt securities | Level 3 |  |
Financial Assets: |  |
Short-term marketable debt securities | 0 | 0
Money market funds |  |
Financial Assets: |  |
Cash equivalents | 112,142 | 1,032,500
Money market funds | Level 1 |  |
Financial Assets: |  |
Cash equivalents | 112,142 | 1,032,500
Money market funds | Level 2 |  |
Financial Assets: |  |
Cash equivalents | 0 | 0
Money market funds | Level 3 |  |
Financial Assets: |  |
Cash equivalents | 0 | $ 0
Income deposit funds |  |
Financial Assets: |  |
Cash equivalents | 102,412 |
Income deposit funds | Level 1 |  |
Financial Assets: |  |
Cash equivalents | 0 |
Income deposit funds | Level 2 |  |
Financial Assets: |  |
Cash equivalents | 102,412 |
Income deposit funds | Level 3 |  |
Financial Assets: |  |
Cash equivalents | 0 |
U.S. government debt securities |  |
Financial Assets: |  |
Cash equivalents | 398,485 |
U.S. government debt securities | Level 1 |  |
Financial Assets: |  |
Cash equivalents | 0 |
U.S. government debt securities | Level 2 |  |
Financial Assets: |  |
Cash equivalents | 398,485 |
U.S. government debt securities | Level 3 |  |
Financial Assets: |  |
Cash equivalents | $ 0 |

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