Fair value of financial instruments and marketable securities - Marketable Securities (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
Jan. 31, 2020 USD ($) $ / shares	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) fund	Sep. 30, 2023 USD ($)
Changes in fair value
Unrealized Gain/(Loss)				$ 1,923	$ 5,484
Investments Purchased				49,614	26,378
Redemptions/Sale				(41,624)	(12,078)
Unrealized Gain/(Loss)				3,954	(3,107)
Realized Gain/(Loss)					(782)
Redemptions/Sale					(2,594)
Unrealized Gain/(Loss)				(1,931)	(4,594)
Realized Gain (Loss)				(622)
Redemptions/Sale				(10,000)
Beginning Balance - Total		$ 32,333	$ 148,115	41,261	134,457
Unrealized Gain/(Loss) - Total		6,018	(3,931)	3,946	(2,217)
Realized Gain/(Loss) - Total		(622)		(622)	(782)
Foreign Currency Unrealized Gain/(Loss) - Total		400	(1,426)	(3,289)	(17)
Investments Purchased - Total		32,208	8,219	49,614	26,378
Redemptions/Sale - Total		(31,051)	(7,830)	(51,624)	(14,672)
Ending Balance - Total		39,286	143,147	39,286	143,147
ClearPoint Convertible note
Purchase of convertible note				476,680
Marketable securities - equity investments
Changes in fair value
Beginning Balance		16,889	127,945	22,634	108,261
Unrealized Gain/(Loss)		812	1,120	1,923	5,484
Foreign Currency Unrealized Gain/(Loss)		400	(1,426)	(3,289)	(17)
Investments Purchased		32,208	8,219	49,614	26,378
Redemptions/Sale		(21,051)	(7,830)	(41,624)	(12,078)
Ending Balance		29,258	128,028	29,258	128,028
ClearPoint Equity Investment
Changes in fair value
Beginning Balance		4,822	6,477	6,074	10,965
Unrealized Gain/(Loss)		5,206	(1,995)	3,954	(3,107)
Realized Gain/(Loss)					(782)
Redemptions/Sale					(2,594)
Ending Balance		10,028	4,482	10,028	4,482
ClearPoint convertible debt
Changes in fair value
Beginning Balance		10,622	13,693	12,553	15,231
Unrealized Gain/(Loss)			(3,056)	(1,931)	(4,594)
Realized Gain (Loss)		(622)		(622)
Redemptions/Sale		(10,000)		(10,000)
Ending Balance		$ 0	$ 10,637	$ 0	$ 10,637
ClearPoint Convertible note
Purchase of convertible note	$ 10,000
Conversion price - convertible note \| $ / shares	$ 6.00
Term of convertible note	5 years
Mutual Funds
Equity Investments
Number of mutual funds denominated in a foreign currency \| fund				1

The price per share of the conversion feature embedded in the available-for-sale convertible debt securities.

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Amount of realized gain (loss) from sale of Clearpoint Equity Investment measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) on ClearPoint equity investment measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) on marketable equity investments and convertible debt securities measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) from foreign currency transaction on marketable equity investments and convertible debt securities.

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Amount of unrealized gain (loss) from foreign currency transaction on marketable securities.

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The number of mutual funds invested in that are denominated in a foreign currency.

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The cash inflow associated with a principal payment received by the entity on Clearpoint convertible debt security during the period.

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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of Clearpoint Equity Investment during the period.

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The cash inflow associated with the aggregate amount received by the entity through sale or redemption of marketable equity investments and convertible debt securities during the period.

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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