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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
--- | --- | ---
Jan. 31, 2020 USD ($) $ / shares | Dec. 31, 2023 USD ($) fund | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Changes in fair value |  |  |  |
Unrealized Gain/(Loss) |  | $ 2,517 | $ (7,992) | $ 1,673
Realized Gain/(Loss) |  | 4,383 |  |
Investments Purchased |  | 38,398 | 22,787 | 210,018
Redemptions/Sale |  | (132,228) | (112,958) | (4,281)
Unrealized Gain/(Loss) |  | (1,515) | (3,560) | (6,078)
Realized Gain/(Loss) |  | (782) |  |
Redemptions/Sale |  | (2,594) |  |
Unrealized Gain/(Loss) |  | (2,678) | (5,740) | (8,281)
Beginning Balance - Total |  | 134,457 | 242,469 |
Unrealized Gain/(Loss) - Total |  | (1,676) | (17,292) |
Realized Gain/(Loss) - Total |  | 3,601 |  |
Foreign Currency Unrealized Gain/(Loss) - Total |  | 1,384 | (549) |
Investments Purchased - Total |  | 38,432 | 22,787 |
Redemptions/Sale - Total |  | (134,937) | (112,958) |
Ending Balance - Total |  | $ 41,261 | 134,457 | 242,469
Equity Investments |  |  |  |
Number of mutual funds denominated in a foreign currency | fund |  | 1 |  |
ClearPoint Convertible note |  |  |  |
Purchase of convertible note |  | $ 174,086 | 52,764 | 333,148
Marketable securities - equity investments |  |  |  |
Changes in fair value |  |  |  |
Beginning Balance |  | 108,261 | 206,973 |
Unrealized Gain/(Loss) |  | 2,517 | (7,992) |
Realized Gain/(Loss) |  | 4,383 |  |
Foreign Currency Unrealized Gain/(Loss) |  | 1,384 | (549) |
Investments Purchased |  | 38,432 | 22,787 |
Redemptions/Sale |  | (132,343) | (112,958) |
Ending Balance |  | 22,634 | 108,261 | 206,973
ClearPoint Equity Investment |  |  |  |
Changes in fair value |  |  |  |
Beginning Balance |  | 10,965 | 14,525 |
Unrealized Gain/(Loss) |  | (1,515) | (3,560) |
Realized Gain/(Loss) |  | (782) |  |
Redemptions/Sale |  | (2,594) |  |
Ending Balance |  | 6,074 | 10,965 | 14,525
ClearPoint convertible debt |  |  |  |
Changes in fair value |  |  |  |
Beginning Balance |  | 15,231 | 20,971 |
Unrealized Gain/(Loss) |  | (2,678) | (5,740) |
Ending Balance |  | $ 12,553 | $ 15,231 | $ 20,971
ClearPoint Convertible note |  |  |  |
Purchase of convertible note | $ 10,000 |  |  |
Conversion price - convertible note | $ / shares | $ 6.00 |  |  |
Term of convertible note | 5 years |  |  |

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