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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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