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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 ($) | Jun. 30, 2025 | Dec. 31, 2024
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | $ 1,518,608,000 | $ 147,691,000
Amortized Cost | 3,963,054,000 | 1,859,871,000
Unrealized Gain | 3,865,000 | 3,583,000
Unrealized (Loss) | (351,000) | (1,012,000)
Fair Value | 3,966,568,000 | 1,862,442,000
Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 37,075,000 | 51,410,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 37,075,000 | 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 | 1,216,292,000 | 102,804,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 1,216,292,000 | 102,804,000
Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 2,709,687,000 | 1,705,657,000
Unrealized Gain | 3,865,000 | 3,583,000
Unrealized (Loss) | (351,000) | (1,012,000)
Fair Value | 2,713,201,000 | 1,708,228,000
Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 727,465,000 | 466,769,000
Unrealized Gain | 1,573,000 | 1,125,000
Unrealized (Loss) | (91,000) | (316,000)
Fair Value | 728,947,000 | 467,578,000
Level II | U.S. treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 1,643,147,000 | 1,120,478,000
Unrealized Gain | 2,284,000 | 2,403,000
Unrealized (Loss) | (210,000) | (677,000)
Fair Value | 1,645,221,000 | 1,122,204,000
Level II | U.S. government agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 96,015,000 | 69,872,000
Unrealized Gain | 8,000 | 55,000
Unrealized (Loss) | (50,000) | (19,000)
Fair Value | 95,973,000 | 69,908,000
Level II | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 243,060,000 | 48,538,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 243,060,000 | 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 | 1,518,608,000 | 147,691,000
Cash & Cash Equivalents | Fair Value, Recurring | Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 30,227,000 | 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 | 1,216,292,000 | 102,804,000
Cash & Cash Equivalents | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 272,089,000 | 0
Cash & Cash Equivalents | Fair Value, Recurring | Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 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 | 109,212,000 | 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 | 162,877,000 | 0
Available-for-sale Securities | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 2,441,112,000 | 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 | 2,441,112,000 | 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 | 728,947,000 | 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 | 1,536,009,000 | 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 | 95,973,000 | 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 | 80,183,000 | 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 | 6,848,000 | 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 | 6,848,000 | 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
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
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
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
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

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- Definition Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -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 5: http://www.xbrl.org/2009/role/commonPracticeRef -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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