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Fair value of financial instruments and investments - Convertible senior notes (Details) - Convertible debt - 1.50% Convertible senior notes due 2026 - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2019
Long-term debt
Principal	$ 287,500	$ 287,500	$ 287,500
Interest rate ( as a percent )			1.50%
Significant other observable inputs (level 2)
Long-term debt
Fair value of convertible notes	$ 265,300	$ 281,700

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