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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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