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Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financial Assets: |  |
Cash and cash equivalents: | $ 225,130 | $ 408,696
Amortized Cost or Carrying Value | 1,954,699 | 3,353,312
Amortized Cost or Carrying Value | 3,220 | 4,901
Amortized Cost or Carrying Value | 1,957,919 | 3,358,213
Total financial assets | 2,183,049 | 3,766,909
Gross Unrealized Gains | 7,685 | 17,583
Gross Unrealized Losses Less Than 12 Months | (1,890) | (10,936)
Gross Unrealized Losses More Than 12 Months | (612) | (8,796)
Marketable securities, aggregate fair value | 1,959,882 | 3,351,163
Equity securities, aggregate fair value | 3,220 | 4,901
Investments, aggregate fair value | 1,963,102 | 3,356,064
Total financial assets | 2,188,232 | 3,764,760
Level 1 |  |
Financial Assets: |  |
Cash and cash equivalents: | 210,071 | 408,696
Marketable securities, aggregate fair value | 400,564 | 510,156
Equity securities, aggregate fair value | 3,220 | 4,901
Investments, aggregate fair value | 403,784 | 515,057
Total financial assets | 613,855 | 923,753
Level 2 |  |
Financial Assets: |  |
Cash and cash equivalents: | 15,059 | 0
Marketable securities, aggregate fair value | 1,559,318 | 2,841,007
Equity securities, aggregate fair value | 0 | 0
Investments, aggregate fair value | 1,559,318 | 2,841,007
Total financial assets | 1,574,377 | 2,841,007
Level 3 |  |
Financial Assets: |  |
Cash and cash equivalents: | 0 | 0
Marketable securities, aggregate fair value | 0 | 0
Equity securities, aggregate fair value | 0 | 0
Investments, aggregate fair value | 0 | 0
Total financial assets | 0 | 0
U.S. Treasury securities |  |
Financial Assets: |  |
Amortized Cost or Carrying Value | 379,846 | 410,665
Gross Unrealized Gains | 1,243 | 2,162
Gross Unrealized Losses Less Than 12 Months | (296) | (7)
Gross Unrealized Losses More Than 12 Months | (55) | (1,665)
Marketable securities, aggregate fair value | 380,738 | 411,155
U.S. Treasury securities | Level 1 |  |
Financial Assets: |  |
Marketable securities, aggregate fair value | 380,738 | 411,155
U.S. Treasury securities | Level 2 |  |
Financial Assets: |  |
Marketable securities, aggregate fair value | 0 | 0
U.S. Treasury securities | Level 3 |  |
Financial Assets: |  |
Marketable securities, aggregate fair value | 0 | 0
Non-U.S. government securities |  |
Financial Assets: |  |
Amortized Cost or Carrying Value | 2,909 | 83,576
Gross Unrealized Gains | 27 | 55
Gross Unrealized Losses Less Than 12 Months | 0 | (111)
Gross Unrealized Losses More Than 12 Months | 0 | (1,209)
Marketable securities, aggregate fair value | 2,936 | 82,311
Non-U.S. government securities | Level 1 |  |
Financial Assets: |  |
Marketable securities, aggregate fair value | 2,936 | 82,311
Non-U.S. government securities | Level 2 |  |
Financial Assets: |  |
Marketable securities, aggregate fair value | 0 | 0
Non-U.S. government securities | Level 3 |  |
Financial Assets: |  |
Marketable securities, aggregate fair value | 0 | 0
Corporate debt securities and commercial paper |  |
Financial Assets: |  |
Amortized Cost or Carrying Value | 1,571,944 | 2,859,071
Gross Unrealized Gains | 6,415 | 15,366
Gross Unrealized Losses Less Than 12 Months | (1,594) | (10,818)
Gross Unrealized Losses More Than 12 Months | (557) | (5,922)
Marketable securities, aggregate fair value | 1,576,208 | 2,857,697
Corporate debt securities and commercial paper | Level 1 |  |
Financial Assets: |  |
Marketable securities, aggregate fair value | 16,890 | 16,690
Corporate debt securities and commercial paper | Level 2 |  |
Financial Assets: |  |
Marketable securities, aggregate fair value | 1,559,318 | 2,841,007
Corporate debt securities and commercial paper | Level 3 |  |
Financial Assets: |  |
Marketable securities, aggregate fair value | 0 | 0
Money market funds |  |
Financial Assets: |  |
Cash and cash equivalents: | 207,323 | 408,696
Money market funds | Level 1 |  |
Financial Assets: |  |
Cash and cash equivalents: | 207,323 | 408,696
Money market funds | Level 2 |  |
Financial Assets: |  |
Cash and cash equivalents: | 0 | 0
Money market funds | Level 3 |  |
Financial Assets: |  |
Cash and cash equivalents: | 0 | $ 0
Commercial paper |  |
Financial Assets: |  |
Cash and cash equivalents: | 15,059 |
Commercial paper | Level 1 |  |
Financial Assets: |  |
Cash and cash equivalents: | 0 |
Commercial paper | Level 2 |  |
Financial Assets: |  |
Cash and cash equivalents: | 15,059 |
Commercial paper | Level 3 |  |
Financial Assets: |  |
Cash and cash equivalents: | 0 |
U.S. Treasury securities |  |
Financial Assets: |  |
Cash and cash equivalents: | 2,748 |
U.S. Treasury securities | Level 1 |  |
Financial Assets: |  |
Cash and cash equivalents: | 2,748 |
U.S. Treasury securities | Level 2 |  |
Financial Assets: |  |
Cash and cash equivalents: | 0 |
U.S. Treasury securities | Level 3 |  |
Financial Assets: |  |
Cash and cash equivalents: | $ 0 |

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