Fair value of financial instruments and marketable securities - Marketable Securities (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
Jan. 31, 2020 USD ($) $ / shares	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) fund	Jun. 30, 2023 USD ($)
Changes in fair value
Unrealized Gain/(Loss)				$ 1,111	$ 4,364
Investments Purchased				17,406	18,159
Redemptions/Sale				(20,573)	(4,249)
Unrealized Gain/(Loss)				(1,252)	(1,112)
Realized Gain/(Loss)					(782)
Redemptions/Sale					(2,594)
Unrealized Gain/(Loss)				(1,931)	(1,539)
Beginning Balance - Total		$ 49,181	$ 134,775	41,261	134,457
Unrealized Gain/(Loss) - Total		(2,957)	(414)	(2,072)	1,714
Realized Gain/(Loss) - Total			(782)		(782)
Foreign Currency Unrealized Gain/(Loss) - Total		(2,864)	1,177	(3,689)	1,410
Investments Purchased - Total		8,340	18,159	17,406	18,159
Redemptions/Sale - Total		(19,367)	(4,800)	(20,573)	(6,843)
Ending Balance - Total		32,333	148,115	32,333	148,115
ClearPoint Convertible note
Purchase of convertible note				291,734
Marketable securities - equity investments
Changes in fair value
Beginning Balance		30,379	108,559	22,634	108,261
Unrealized Gain/(Loss)		401	2,256	1,111	4,364
Foreign Currency Unrealized Gain/(Loss)		(2,864)	1,177	(3,689)	1,410
Investments Purchased		8,340	18,159	17,406	18,159
Redemptions/Sale		(19,367)	(2,206)	(20,573)	(4,249)
Ending Balance		16,889	127,945	16,889	127,945
ClearPoint Equity Investment
Changes in fair value
Beginning Balance		6,083	10,926	6,074	10,965
Unrealized Gain/(Loss)		(1,261)	(1,073)	(1,252)	(1,112)
Realized Gain/(Loss)			(782)		(782)
Redemptions/Sale			(2,594)		(2,594)
Ending Balance		4,822	6,477	4,822	6,477
ClearPoint convertible debt
Changes in fair value
Beginning Balance		12,719	15,290	12,553	15,231
Unrealized Gain/(Loss)		(2,097)	(1,597)	(1,931)	(1,538)
Ending Balance		$ 10,622	$ 13,693	$ 10,622	$ 13,693
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 investment in equity security of ClearPoint Neuro, Inc. 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 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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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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Amount of cash outflow to acquire 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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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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