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Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financial Assets:
Marketable Securities:	$ 3,369,820	$ 2,942,076
Corporate debt securities
Financial Assets:
Marketable Securities:	2,344,055	1,896,041
Commercial paper
Financial Assets:
Marketable Securities:	419,901	390,283
U.S. government treasury securities
Financial Assets:
Marketable Securities:	399,219	466,460
Certificates of deposit
Financial Assets:
Marketable Securities:	205,150	187,802
U.S. government agency securities
Financial Assets:
Marketable Securities:	1,495	1,490
Fair Value, Recurring
Financial Assets:
Total financial assets	4,422,006	4,147,593
Fair Value, Recurring | Corporate debt securities
Financial Assets:
Marketable Securities:	2,344,055	1,896,041
Fair Value, Recurring | Commercial paper
Financial Assets:
Marketable Securities:	419,901	390,283
Fair Value, Recurring | U.S. government treasury securities
Financial Assets:
Marketable Securities:	399,219	466,460
Fair Value, Recurring | Certificates of deposit
Financial Assets:
Marketable Securities:	205,150	187,802
Fair Value, Recurring | U.S. government agency securities
Financial Assets:
Marketable Securities:	1,495	1,490
Fair Value, Recurring | Money market funds
Financial Assets:
Cash equivalents:	714,073	1,193,927
Fair Value, Recurring | Commercial paper
Financial Assets:
Cash equivalents:	296,544
Fair Value, Recurring | Certificates of deposit
Financial Assets:
Cash equivalents:	11,916
Fair Value, Recurring | U.S. government treasury securities
Financial Assets:
Cash equivalents:	29,653	9,088
Fair Value, Recurring | Corporate debt securities
Financial Assets:
Cash equivalents:		2,502
Fair Value, Recurring | Level 1
Financial Assets:
Total financial assets	714,073	1,193,927
Fair Value, Recurring | Level 1 | Corporate debt securities
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 1 | Commercial paper
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 1 | U.S. government treasury securities
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 1 | Certificates of deposit
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 1 | U.S. government agency securities
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 1 | Money market funds
Financial Assets:
Cash equivalents:	714,073	1,193,927
Fair Value, Recurring | Level 1 | Commercial paper
Financial Assets:
Cash equivalents:	0
Fair Value, Recurring | Level 1 | Certificates of deposit
Financial Assets:
Cash equivalents:	0
Fair Value, Recurring | Level 1 | U.S. government treasury securities
Financial Assets:
Cash equivalents:	0	0
Fair Value, Recurring | Level 1 | Corporate debt securities
Financial Assets:
Cash equivalents:		0
Fair Value, Recurring | Level 2
Financial Assets:
Total financial assets	3,707,933	2,953,666
Fair Value, Recurring | Level 2 | Corporate debt securities
Financial Assets:
Marketable Securities:	2,344,055	1,896,041
Fair Value, Recurring | Level 2 | Commercial paper
Financial Assets:
Marketable Securities:	419,901	390,283
Fair Value, Recurring | Level 2 | U.S. government treasury securities
Financial Assets:
Marketable Securities:	399,219	466,460
Fair Value, Recurring | Level 2 | Certificates of deposit
Financial Assets:
Marketable Securities:	205,150	187,802
Fair Value, Recurring | Level 2 | U.S. government agency securities
Financial Assets:
Marketable Securities:	1,495	1,490
Fair Value, Recurring | Level 2 | Money market funds
Financial Assets:
Cash equivalents:	0	0
Fair Value, Recurring | Level 2 | Commercial paper
Financial Assets:
Cash equivalents:	296,544
Fair Value, Recurring | Level 2 | Certificates of deposit
Financial Assets:
Cash equivalents:	11,916
Fair Value, Recurring | Level 2 | U.S. government treasury securities
Financial Assets:
Cash equivalents:	29,653	9,088
Fair Value, Recurring | Level 2 | Corporate debt securities
Financial Assets:
Cash equivalents:		2,502
Fair Value, Recurring | Level 3
Financial Assets:
Total financial assets	0	0
Fair Value, Recurring | Level 3 | Corporate debt securities
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 3 | Commercial paper
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 3 | U.S. government treasury securities
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 3 | Certificates of deposit
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 3 | U.S. government agency securities
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 3 | Money market funds
Financial Assets:
Cash equivalents:	0	0
Fair Value, Recurring | Level 3 | Commercial paper
Financial Assets:
Cash equivalents:	0
Fair Value, Recurring | Level 3 | Certificates of deposit
Financial Assets:
Cash equivalents:	0
Fair Value, Recurring | Level 3 | U.S. government treasury securities
Financial Assets:
Cash equivalents:	$ 0	0
Fair Value, Recurring | Level 3 | Corporate debt securities
Financial Assets:
Cash equivalents:		$ 0

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