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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
	Jan. 31, 2020 USD ($) $ / shares	Mar. 31, 2023 USD ($) fund	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Equity Investments
Net unrealized gain (loss) on equity investments		$ 2,166	$ (6,477)
Redemption of marketable securities- equity investments		2,196	2,423
ClearPoint Convertible note
Purchase of convertible note			39,035
Unrealized gain (loss) on convertible note		59	(1,542)
ClearPoint equity investment
Equity Investments
Net unrealized gain (loss) on equity investments		(100)	(1,000)
ClearPoint equity investment | Quoted prices in active markets for identical assets (Level 1)
Equity Investments
Fair value of equity investment		10,900		$ 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		100	(1,500)
ClearPoint convertible debt | Recurring basis | Significant other observable inputs (Level 2) | Deposits and Other Assets, Noncurrent
ClearPoint Convertible note
ClearPoint convertible debt security		$ 15,300		$ 15,200
Mutual Funds
Equity Investments
Number of mutual funds denominated in a foreign currency | fund		1
Net unrealized gain (loss) on equity investments		$ 2,200	(6,500)
Redemption of marketable securities- equity investments		2,200	2,400
Unrealized foreign currency gains (losses) on equity investments		$ 300	$ 700

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