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Fair value of financial instruments and investments - Marketable Securities (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2020 USD ($) $ / shares	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) fund	Sep. 30, 2022 USD ($) fund	Dec. 31, 2022 USD ($)
Equity Investments
Purchase of marketable securities - equity investments				$ 26,378	$ 22,787
Net unrealized gain (loss) on equity investments				5,484	(11,319)
Redemption of marketable securities- equity investments				12,078	104,431
ClearPoint Convertible note
Purchase of convertible note					40,429
Unrealized gain (loss) on convertible note				(4,594)	(2,392)
ClearPoint Equity Investment
Equity Investments
Net unrealized gain (loss) on equity investments		$ (2,000)	$ (3,500)	(3,100)	(1,100)
Loss on sale of equity investments		0		800
ClearPoint Equity Investment | Quoted prices in active markets for identical assets (Level 1)
Equity Investments
Fair value of equity investment		4,500		4,500		$ 11,000
ClearPoint convertible debt
ClearPoint Convertible note
Purchase of convertible note	$ 10,000
Conversion price - convertible note | $ / shares	$ 6.00
Term of convertible note	5 years
Unrealized gain (loss) on convertible note		(3,100)	(4,400)	(4,600)	$ (2,400)
ClearPoint convertible debt | Recurring basis | Significant other observable inputs (Level 2) | Deposits and Other Assets, Noncurrent
ClearPoint Convertible note
ClearPoint convertible debt security		10,600		$ 10,600		$ 15,200
Mutual Funds
Equity Investments
Number of mutual funds denominated in a foreign currency | fund				1
Number of mutual funds liquidated | fund					1
Net unrealized gain (loss) on equity investments		1,100	100	$ 5,500	$ (11,300)
Redemption of marketable securities- equity investments		7,800	100,800	$ 12,100	104,400
Unrealized foreign currency gains (losses) on equity investments		$ (1,400)	$ (1,400)		$ (1,000)

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