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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		6 Months Ended
	Jan. 31, 2020 USD ($) $ / shares	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) fund	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Equity Investments
Purchase of marketable securities - equity investments				$ 18,159
Net unrealized gain (loss) on equity investments				4,364	$ (11,356)
Redemption of marketable securities- equity investments				4,249	3,630
ClearPoint Convertible note
Purchase of convertible note					40,429
Unrealized gain (loss) on convertible note				(1,539)	1,995
ClearPoint equity investment
Equity Investments
Net unrealized gain (loss) on equity investments		$ (1,100)	$ 3,400	(1,100)	2,400
Loss on sale of equity investments		800		800
ClearPoint equity investment | Quoted prices in active markets for identical assets (Level 1)
Equity Investments
Fair value of equity investment		6,500		6,500		$ 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		(1,600)	3,500	(1,500)	2,000
ClearPoint convertible debt | Recurring basis | Significant other observable inputs (Level 2) | Deposits and Other Assets, Noncurrent
ClearPoint Convertible note
ClearPoint convertible debt security		13,700		$ 13,700		$ 15,200
Mutual Funds
Equity Investments
Number of mutual funds denominated in a foreign currency | fund				1
Net unrealized gain (loss) on equity investments		2,300	(4,900)	$ 4,400	(11,400)
Redemption of marketable securities- equity investments		2,200	1,200	4,200	3,600
Unrealized foreign currency gains (losses) on equity investments		$ 1,200	$ (300)	$ 1,400	$ 400

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