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Fair Value - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques |  |
Cash and cash equivalents | $ 834,101 | $ 744,721
Available-for-sale investments | 139,159 | 34,015
Equity investment | 10,000 | 10,000
Convertible Senior Notes due 2026 |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt instruments | 663,690 | 731,310
Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Cash and cash equivalents | 834,101 | 744,721
Available-for-sale investments | 0 | 0
Equity investment | 0 | 0
Level 1 | Convertible Senior Notes due 2026 |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt instruments | 0 | 0
Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Cash and cash equivalents | 0 | 0
Available-for-sale investments | 139,159 | 34,015
Equity investment | 0 | 0
Level 2 | Convertible Senior Notes due 2026 |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt instruments | 663,690 | 731,310
Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Cash and cash equivalents | 0 | 0
Available-for-sale investments | 0 | 0
Equity investment | 10,000 | 10,000
Level 3 | Convertible Senior Notes due 2026 |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Debt instruments | $ 0 | $ 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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