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Fair Value Measurements (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Fair Value Measurements |  |  |
Short-term investments (U.S. Government Securities and Agency Investments) | $ 262,059 |  | $ 447,831
Mark-to-market adjustment on forward exchange contracts | (585) | $ (583) |
Level 2 | Forward exchange contracts | Estimate of fair value measurement |  |  |
Fair Value Measurements |  |  |
Mark-to-market adjustment on forward exchange contracts | (600) |  |
Recurring | Estimate of fair value measurement |  |  |
Fair Value Measurements |  |  |
Total | 554,917 |  | 529,883
Recurring | Forward exchange contracts | Estimate of fair value measurement |  |  |
Fair Value Measurements |  |  |
Mark-to-market adjustment on forward exchange contracts | (585) |  | 267
Recurring | Money market funds, U.S. Government Securities and Agency Investments | Estimate of fair value measurement |  |  |
Fair Value Measurements |  |  |
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments) | 150,229 |  | 81,320
Recurring | U.S. Government Securities and Agency Investments | Estimate of fair value measurement |  |  |
Fair Value Measurements |  |  |
Short-term investments (U.S. Government Securities and Agency Investments) | 262,059 |  | 448,296
Long-term investments (U.S. Government Securities and Agency Investments) | 143,214 |  |
Recurring | Level 1 |  |  |
Fair Value Measurements |  |  |
Total | 555,502 |  | 529,616
Recurring | Level 1 | Money market funds, U.S. Government Securities and Agency Investments |  |  |
Fair Value Measurements |  |  |
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments) | 150,229 |  | 81,320
Recurring | Level 1 | U.S. Government Securities and Agency Investments |  |  |
Fair Value Measurements |  |  |
Short-term investments (U.S. Government Securities and Agency Investments) | 262,059 |  | 448,296
Long-term investments (U.S. Government Securities and Agency Investments) | 143,214 |  |
Recurring | Level 2 |  |  |
Fair Value Measurements |  |  |
Mark-to-market adjustment on forward exchange contracts | (585) |  |
Total |  |  | 267
Recurring | Level 2 | Forward exchange contracts |  |  |
Fair Value Measurements |  |  |
Mark-to-market adjustment on forward exchange contracts | $ (585) |  | $ 267

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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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