Fair value of financial instruments and investments - Marketable Securities (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
Jan. 31, 2020 USD ($) $ / shares	Dec. 31, 2023 USD ($) fund	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Changes in fair value
Unrealized Gain/(Loss)		$ 2,517	$ (7,992)	$ 1,673
Realized Gain/(Loss)		4,383
Investments Purchased		38,398	22,787	210,018
Redemptions/Sale		(132,228)	(112,958)	(4,281)
Unrealized Gain/(Loss)		(1,515)	(3,560)	(6,078)
Realized Gain/(Loss)		(782)
Redemptions/Sale		(2,594)
Unrealized Gain/(Loss)		(2,678)	(5,740)	(8,281)
Beginning Balance - Total		134,457	242,469
Unrealized Gain/(Loss) - Total		(1,676)	(17,292)
Realized Gain/(Loss) - Total		3,601
Foreign Currency Unrealized Gain/(Loss) - Total		1,384	(549)
Investments Purchased - Total		38,432	22,787
Redemptions/Sale - Total		(134,937)	(112,958)
Ending Balance - Total		$ 41,261	134,457	242,469
Equity Investments
Number of mutual funds denominated in a foreign currency \| fund		1
ClearPoint Convertible note
Purchase of convertible note		$ 174,086	52,764	333,148
Marketable securities - equity investments
Changes in fair value
Beginning Balance		108,261	206,973
Unrealized Gain/(Loss)		2,517	(7,992)
Realized Gain/(Loss)		4,383
Foreign Currency Unrealized Gain/(Loss)		1,384	(549)
Investments Purchased		38,432	22,787
Redemptions/Sale		(132,343)	(112,958)
Ending Balance		22,634	108,261	206,973
ClearPoint Equity Investment
Changes in fair value
Beginning Balance		10,965	14,525
Unrealized Gain/(Loss)		(1,515)	(3,560)
Realized Gain/(Loss)		(782)
Redemptions/Sale		(2,594)
Ending Balance		6,074	10,965	14,525
ClearPoint convertible debt
Changes in fair value
Beginning Balance		15,231	20,971
Unrealized Gain/(Loss)		(2,678)	(5,740)
Ending Balance		$ 12,553	$ 15,231	$ 20,971
ClearPoint Convertible note
Purchase of convertible note	$ 10,000
Conversion price - convertible note \| $ / shares	$ 6.00
Term of convertible note	5 years

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

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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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Amount of cash outflow for purchase of marketable security.

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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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