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Fair value of financial instruments and investments - Marketable Securities (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2020	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in fair value
Unrealized Gain/(Loss)		$ 2,572	$ 2,517	$ (7,992)
Realized Gain/(Loss)			4,383
Investments Purchased		59,377	38,398	22,787
Redemptions/Sale		(48,127)	(132,228)	(112,958)
Unrealized Gain/(Loss)		7,685	(1,515)	(3,560)
Realized Gain/(Loss)			(782)
Redemptions/Sale			(2,594)
Unrealized Gain/(Loss)		(1,931)	(2,678)	(5,740)
Realized Gain (Loss)		(622)
Redemptions/Sale		(10,000)
Beginning Balance - Total		41,261	134,457
Unrealized Gain/(Loss) - Total		8,326	(1,676)
Realized Gain/(Loss) - Total		(622)	3,601
Foreign Currency Unrealized Gain/(Loss) - Total		(7,422)	1,384
Investments Purchased - Total		59,377	38,432
Redemptions/Sale - Total		(58,127)	(134,937)
Ending Balance - Total		42,793	41,261	134,457
ClearPoint Convertible note
Purchase of convertible note		607,984	174,086	52,764
Marketable securities - equity investments
Changes in fair value
Beginning Balance		22,634	108,261
Unrealized Gain/(Loss)		2,572	2,517
Realized Gain/(Loss)			4,383
Foreign Currency Unrealized Gain/(Loss)		(7,422)	1,384
Investments Purchased		59,377	38,432
Redemptions/Sale		(48,127)	(132,343)
Ending Balance		29,034	22,634	108,261
ClearPoint Equity Investment
Changes in fair value
Beginning Balance		6,074	10,965
Unrealized Gain/(Loss)		7,685	(1,515)
Realized Gain/(Loss)			(782)
Redemptions/Sale			(2,594)
Ending Balance		13,759	6,074	10,965
ClearPoint convertible debt
Changes in fair value
Beginning Balance		12,553	15,231
Unrealized Gain/(Loss)		(1,931)	(2,678)
Realized Gain (Loss)		(622)
Redemptions/Sale		(10,000)
Ending Balance		$ 0	$ 12,553	$ 15,231
ClearPoint Convertible note
Purchase of convertible note	$ 10,000
Conversion price - convertible note	$ 6
Term of convertible note	5 years

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

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