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Fair value of financial instruments and investments - Marketable Securities (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity Investments
Purchase of equity investments			$ 100
Purchase of marketable securities - equity investments		$ 22,787	210,018
Net unrealized gain (loss) on equity investments		(7,992)	1,673
Redemption of marketable securities- equity investments		112,958	4,281
ClearPoint Convertible note
Purchase of convertible note		52,764	333,148	$ 1,439,665
Unrealized gain (loss) on convertible note		(5,740)	(8,281)	$ 19,252
Recurring basis
Equity Investments
Fair value of equity investment		108,261	206,973
Recurring basis | Quoted prices in active markets for identical assets (Level 1)
Equity Investments
Fair value of equity investment		108,261	206,973
Marketable securities - equity investments
Equity Investments
Net unrealized gain (loss) on equity investments		(8,000)	1,700
Redemption of marketable securities- equity investments		113,000	4,300
Unrealized foreign currency losses on equity investments		500	400
ClearPoint equity investment
Equity Investments
Net unrealized gain (loss) on equity investments		(3,500)	6,100
ClearPoint equity investment | Recurring basis | Quoted prices in active markets for identical assets (Level 1) | Deposits and Other Assets, Noncurrent
Equity Investments
Fair value of equity investment		11,000	14,500
ClearPoint convertible debt
ClearPoint Convertible note
Purchase of convertible note	$ 10,000
Conversion price - convertible note	$ 6.00
Term of convertible note	5 years
Unrealized gain (loss) on convertible note		(5,800)	8,300
ClearPoint convertible debt | Recurring basis | Significant other observable inputs (Level 2) | Deposits and Other Assets, Noncurrent
ClearPoint Convertible note
ClearPoint convertible debt security		$ 15,200	$ 21,000

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