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Fair value of financial instruments and investments - Marketable Securities (Details) $ / shares in Units, $ in Thousands	1 Months Ended					12 Months Ended
	Nov. 30, 2021 USD ($)	Aug. 31, 2021 USD ($)	Feb. 28, 2021 USD ($) fund $ / shares	Jan. 31, 2020 USD ($) $ / shares	May 31, 2019 USD ($) $ / shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Equity Investments
Purchase of equity investment in ClearPoint						$ 100		$ 4,000
Purchase of marketable securities - equity investments						210,018
Net unrealized gain (loss) on equity investments						1,673
Redemption of marketable securities- equity investments						4,281
ClearPoint Convertible note
Purchase of convertible note						333,148	$ 1,439,665	$ 494,068
Unrealized gain (loss) on convertible note						(8,281)	19,252
Recurring basis
Equity Investments
Fair value of equity investment						206,973
Recurring basis | Quoted prices in active markets for identical assets (Level 1)
Equity Investments
Fair value of equity investment						206,973
Marketable securities - equity investments
Equity Investments
Number of Mutual Funds Invested In | fund			2
Purchase of marketable securities - equity investments	$ 4,600	$ 5,400	$ 200,000
Net unrealized gain (loss) on equity investments						1,700
Redemption of marketable securities- equity investments						4,300
Unrealized foreign currency losses on equity investments						400
ClearPoint equity investment
Equity Investments
Purchase of equity investment in ClearPoint			$ 100		$ 4,000
Share price (in USD per share) | $ / shares			$ 23.50		$ 3.10
Net unrealized gain (loss) on equity investments						(6,100)	14,300
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						14,500	20,500
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						(8,300)	19,300
ClearPoint convertible debt | Recurring basis | Significant other observable inputs (Level 2) | Deposits and Other Assets, Noncurrent
ClearPoint Convertible note
ClearPoint convertible debt security						$ 21,000	$ 29,300

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