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Fair value of financial instruments and marketable securities - Marketable Securities, Balance Sheet Disclosures (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Fair value of financial instruments and marketable securities |  |
Marketable securities, Less Than 12 Months | $ 971,244 | $ 330,953
Commercial paper |  |
Fair value of financial instruments and marketable securities |  |
Marketable securities, Less Than 12 Months | 106,561 | 44,779
Corporate debt securities |  |
Fair value of financial instruments and marketable securities |  |
Marketable securities, Less Than 12 Months | 243,415 | 89,321
Government obligations |  |
Fair value of financial instruments and marketable securities |  |
Marketable securities, Less Than 12 Months | $ 621,268 | $ 196,853

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