Fair value estimates (Details) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2024 USD ($) security	Dec. 31, 2023 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Corporate debt securities \| security	35
Aggregate amortized cost	$ 601,270	$ 450,454
Fair value of assets transfers into level 3	0	0
Fair value of assets transfers out of level 3	0	0
Fair value of liabilities transfers into level 3	0	0
Fair value of liabilities transfers out of level 3	$ 0	0
Market Not Active
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Corporate debt securities \| security	3
Recurring Basis \| Market Not Active
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Aggregate a fair value	$ 4,300
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Aggregate amortized cost	32,307	$ 4,000
Corporate debt securities \| Market Not Active
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Aggregate amortized cost	4,300
Corporate debt securities \| Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Aggregate a fair value	$ 32,200

The number of corporate debt securities owned by the company.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

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