Fair value of financial instruments and marketable securities - Marketable Securities (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2020 USD ($) $ / shares	Mar. 31, 2024 USD ($) fund	Mar. 31, 2023 USD ($)
Changes in fair value
Unrealized Gain/(Loss)		$ 710	$ 2,166
Investments Purchased		9,065
Redemptions/Sale		(1,207)	(2,196)
Unrealized Gain/(Loss)		9	(39)
Unrealized Gain/(Loss)		166	59
Beginning Balance - Total		41,261	134,457
Unrealized Gain/(Loss) - Total		885	2,186
Foreign Currency Unrealized Gain/(Loss) - Total		(823)	328
Investments Purchased - Total		9,065
Redemptions/Sale - Total		(1,207)	(2,196)
Ending Balance - Total		49,181	134,775
ClearPoint Convertible note
Purchase of convertible note		104,373
Marketable securities - equity investments
Changes in fair value
Beginning Balance		22,634	108,261
Unrealized Gain/(Loss)		710	2,166
Foreign Currency Unrealized Gain/(Loss)		(823)	328
Investments Purchased		9,065
Redemptions/Sale		(1,207)	(2,196)
Ending Balance		30,379	108,559
ClearPoint Equity Investment
Changes in fair value
Beginning Balance		6,074	10,965
Unrealized Gain/(Loss)		9	(39)
Ending Balance		6,083	10,926
ClearPoint convertible debt
Changes in fair value
Beginning Balance		12,553	15,231
Unrealized Gain/(Loss)		166	59
Ending Balance		$ 12,719	$ 15,290
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