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Fair Value Measurements - Schedule of Cash and Available-for-sale Debt Securities' Amortized Cost, Unrealized Gains (Losses) and Fair Value by Significant Investment Category (Details) - USD ($) | Mar. 31, 2025 | Dec. 31, 2024
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | $ 204,459,000 | $ 147,691,000
Amortized Cost | 1,918,016,000 | 1,859,871,000
Unrealized Gain | 3,872,000 | 3,583,000
Unrealized (Loss) | (391,000) | (1,012,000)
Fair Value | 1,921,497,000 | 1,862,442,000
Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 36,224,000 | 51,410,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 36,224,000 | 51,410,000
Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Level I | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 149,453,000 | 102,804,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 149,453,000 | 102,804,000
Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 1,732,339,000 | 1,705,657,000
Unrealized Gain | 3,872,000 | 3,583,000
Unrealized (Loss) | (391,000) | (1,012,000)
Fair Value | 1,735,820,000 | 1,708,228,000
Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 516,106,000 | 466,769,000
Unrealized Gain | 1,338,000 | 1,125,000
Unrealized (Loss) | (140,000) | (316,000)
Fair Value | 517,304,000 | 467,578,000
Level II | U.S. treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 1,119,056,000 | 1,120,478,000
Unrealized Gain | 2,510,000 | 2,403,000
Unrealized (Loss) | (232,000) | (677,000)
Fair Value | 1,121,334,000 | 1,122,204,000
Level II | U.S. government agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 62,438,000 | 69,872,000
Unrealized Gain | 24,000 | 55,000
Unrealized (Loss) | (19,000) | (19,000)
Fair Value | 62,443,000 | 69,908,000
Level II | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 34,739,000 | 48,538,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 34,739,000 | 48,538,000
Cash & Cash Equivalents | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets measured at fair value on a recurring basis | 204,459,000 | 147,691,000
Cash & Cash Equivalents | Fair Value, Recurring | Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 29,601,000 | 44,887,000
Cash & Cash Equivalents | Fair Value, Recurring | Level I | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 149,453,000 | 102,804,000
Cash & Cash Equivalents | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 25,405,000 | 0
Cash & Cash Equivalents | Fair Value, Recurring | Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 4,992,000 | 0
Cash & Cash Equivalents | Fair Value, Recurring | Level II | U.S. treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 14,922,000 | 0
Cash & Cash Equivalents | Fair Value, Recurring | Level II | U.S. government agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Cash & Cash Equivalents | Fair Value, Recurring | Level II | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 5,491,000 | 0
Available-for-sale Securities | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 1,710,415,000 | 1,708,228,000
Available-for-sale Securities | Fair Value, Recurring | Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Available-for-sale Securities | Fair Value, Recurring | Level I | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Available-for-sale Securities | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 1,710,415,000 | 1,708,228,000
Available-for-sale Securities | Fair Value, Recurring | Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 512,312,000 | 467,578,000
Available-for-sale Securities | Fair Value, Recurring | Level II | U.S. treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 1,106,412,000 | 1,122,204,000
Available-for-sale Securities | Fair Value, Recurring | Level II | U.S. government agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 62,443,000 | 69,908,000
Available-for-sale Securities | Fair Value, Recurring | Level II | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 29,248,000 | 48,538,000
Restricted Cash (Current and Non-Current) | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets measured at fair value on a recurring basis | 6,623,000 | 6,523,000
Restricted Cash (Current and Non-Current) | Fair Value, Recurring | Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 6,623,000 | 6,523,000
Restricted Cash (Current and Non-Current) | Fair Value, Recurring | Level I | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Restricted Cash (Current and Non-Current) | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Restricted Cash (Current and Non-Current) | Fair Value, Recurring | Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Restricted Cash (Current and Non-Current) | Fair Value, Recurring | Level II | U.S. treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Restricted Cash (Current and Non-Current) | Fair Value, Recurring | Level II | U.S. government agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Restricted Cash (Current and Non-Current) | Fair Value, Recurring | Level II | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | $ 0 | $ 0

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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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