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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value by Significant Investment Category | The following table summarizes the Company’s cash and available-for-sale securities’ amortized cost, unrealized gains (losses), and fair value by significant investment category reported as cash and cash equivalents, restricted cash short-term, restricted cash, or available-for-sale securities as of June 30, 2025 and December 31, 2024.
(in thousands) |  |  |  |  |  |  |  |  |  | Reported as:
June 30, 2025 |  | Amortized Cost |  | Unrealized Gain |  | Unrealized (Loss) |  | Fair Value |  | Cash & Cash Equivalents |  | Available-for-sale Securities |  |  |  | Restricted Cash (Current and Non-Current)
Cash |  | $ | 37,075 |  |  | $ | — |  |  | $ | — |  |  | $ | 37,075 |  |  | $ | 30,227 |  |  | $ | — |  |  |  |  | $ | 6,848 |
Level I: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 1,216,292 |  |  | — |  |  | — |  |  | 1,216,292 |  |  | 1,216,292 |  |  | — |  |  |  |  |
Level II: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | 727,465 |  |  | 1,573 |  |  | (91) |  |  | 728,947 |  |  | — |  |  | 728,947 |  |  |  |  |
U.S. treasury securities |  | 1,643,147 |  |  | 2,284 |  |  | (210) |  |  | 1,645,221 |  |  | 109,212 |  |  | 1,536,009 |  |  |  |  |
U.S. government agency securities |  | 96,015 |  |  | 8 |  |  | (50) |  |  | 95,973 |  |  | — |  |  | 95,973 |  |  |  |  |
Commercial paper |  | 243,060 |  |  | — |  |  | — |  |  | 243,060 |  |  | 162,877 |  |  | 80,183 |  |  |  |  |
Subtotal |  | 2,709,687 |  |  | 3,865 |  |  | (351) |  |  | 2,713,201 |  |  | 272,089 |  |  | 2,441,112 |  |  |  |  | — |
Total assets measured at fair value on a recurring basis |  | $ | 3,963,054 |  |  | $ | 3,865 |  |  | $ | (351) |  |  | $ | 3,966,568 |  |  | $ | 1,518,608 |  |  | $ | 2,441,112 |  |  |  |  | $ | 6,848 |
(in thousands) |  |  |  |  |  |  |  |  |  | Reported as:
December 31, 2024 |  | Amortized Cost |  | Unrealized Gain |  | Unrealized (Loss) |  | Fair Value |  | Cash & Cash Equivalents |  | Available-for-sale Securities |  |  |  | Restricted Cash (Current and Non-Current)
Cash |  | $ | 51,410 |  |  | $ | — |  |  | $ | — |  |  | $ | 51,410 |  |  | $ | 44,887 |  |  | $ | — |  |  |  |  | $ | 6,523 |
Level I: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 102,804 |  |  | — |  |  | — |  |  | 102,804 |  |  | 102,804 |  |  | — |  |  |  |  | — |
Level II: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | 466,769 |  |  | 1,125 |  |  | (316) |  |  | 467,578 |  |  | — |  |  | 467,578 |  |  |  |  | — |
U.S. treasury securities |  | 1,120,478 |  |  | 2,403 |  |  | (677) |  |  | 1,122,204 |  |  | — |  |  | 1,122,204 |  |  |  |  | — |
U.S. government agency securities |  | 69,872 |  |  | 55 |  |  | (19) |  |  | 69,908 |  |  | — |  |  | 69,908 |  |  |  |  | — |
Commercial paper |  | 48,538 |  |  | — |  |  | — |  |  | 48,538 |  |  | — |  |  | 48,538 |  |  |  |  | — |
Subtotal |  | 1,705,657 |  |  | 3,583 |  |  | (1,012) |  |  | 1,708,228 |  |  | — |  |  | 1,708,228 |  |  |  |  | — |
Total assets measured at fair value on a recurring basis |  | $ | 1,859,871 |  |  | $ | 3,583 |  |  | $ | (1,012) |  |  | $ | 1,862,442 |  |  | $ | 147,691 |  |  | $ | 1,708,228 |  |  |  |  | $ | 6,523 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: 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 2: 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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