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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 ($) | Dec. 31, 2024 | Dec. 31, 2023
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | $ 147,691,000 | $ 86,864,000
Amortized Cost | 1,859,871,000 | 1,676,044,000
Unrealized Gain | 3,583,000 | 3,078,000
Unrealized (Loss) | (1,012,000) | (1,018,000)
Fair Value | 1,862,442,000 | 1,678,104,000
Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 1,705,657,000 | 1,584,820,000
Unrealized Gain | 3,583,000 | 3,078,000
Unrealized (Loss) | (1,012,000) | (1,018,000)
Fair Value | 1,708,228,000 | 1,586,880,000
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 | 147,691,000 | 86,864,000
Cash & Cash Equivalents | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Available-for-sale Securities | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 1,708,228,000 | 1,586,880,000
Available-for-sale Securities | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 1,708,228,000 | 1,586,880,000
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 | 6,523,000 | 4,360,000
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
Corporate bonds | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 466,769,000 | 312,510,000
Unrealized Gain | 1,125,000 | 718,000
Unrealized (Loss) | (316,000) | (378,000)
Fair Value | 467,578,000 | 312,850,000
Corporate bonds | Cash & Cash Equivalents | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Corporate bonds | Available-for-sale Securities | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 467,578,000 | 312,850,000
Corporate bonds | 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
U.S. treasury securities | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 1,120,478,000 | 1,020,167,000
Unrealized Gain | 2,403,000 | 2,344,000
Unrealized (Loss) | (677,000) | (544,000)
Fair Value | 1,122,204,000 | 1,021,967,000
U.S. treasury securities | Cash & Cash Equivalents | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
U.S. treasury securities | Available-for-sale Securities | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 1,122,204,000 | 1,021,967,000
U.S. treasury securities | 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
U.S. government agency securities | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 69,872,000 | 84,154,000
Unrealized Gain | 55,000 | 14,000
Unrealized (Loss) | (19,000) | (96,000)
Fair Value | 69,908,000 | 84,072,000
U.S. government agency securities | Cash & Cash Equivalents | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
U.S. government agency securities | Available-for-sale Securities | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 69,908,000 | 84,072,000
U.S. government agency securities | 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
Commercial paper | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 48,538,000 | 167,989,000
Unrealized Gain | 0 | 2,000
Unrealized (Loss) | 0 | 0
Fair Value | 48,538,000 | 167,991,000
Commercial paper | Cash & Cash Equivalents | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Commercial paper | Available-for-sale Securities | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 48,538,000 | 167,991,000
Commercial paper | 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
Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 51,410,000 | 51,189,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 51,410,000 | 51,189,000
Cash | Cash & Cash Equivalents | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 44,887,000 | 46,829,000
Cash | Available-for-sale Securities | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Cash | Restricted Cash (Current and Non-Current) | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 6,523,000 | 4,360,000
Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Money market funds | Level I |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 102,804,000 | 40,035,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 102,804,000 | 40,035,000
Money market funds | Cash & Cash Equivalents | Fair Value, Recurring | Level I |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 102,804,000 | 40,035,000
Money market funds | Available-for-sale Securities | Fair Value, Recurring | Level I |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Money market funds | Restricted Cash (Current and Non-Current) | Fair Value, Recurring | Level I |  |
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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