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Fair value of financial instruments and marketable securities - Convertible senior notes (Details) - Convertible debt - 2026 Convertible Notes - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2019
Long-term debt
Principal	$ 287,500	$ 287,500	$ 287,500
Interest rate ( as a percent )	1.50%		1.50%
Significant other observable inputs (Level 2)
Long-term debt
Fair value of convertible notes	$ 332,800	$ 321,300

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