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Fair value of financial instruments and marketable securities - Marketable Securities (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 31, 2020 USD ($) $ / shares | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) fund | Jun. 30, 2023 USD ($)
Changes in fair value |  |  |  |  |
Unrealized Gain/(Loss) |  |  |  | $ 1,111 | $ 4,364
Investments Purchased |  |  |  | 17,406 | 18,159
Redemptions/Sale |  |  |  | (20,573) | (4,249)
Unrealized Gain/(Loss) |  |  |  | (1,252) | (1,112)
Realized Gain/(Loss) |  |  |  |  | (782)
Redemptions/Sale |  |  |  |  | (2,594)
Unrealized Gain/(Loss) |  |  |  | (1,931) | (1,539)
Beginning Balance - Total |  | $ 49,181 | $ 134,775 | 41,261 | 134,457
Unrealized Gain/(Loss) - Total |  | (2,957) | (414) | (2,072) | 1,714
Realized Gain/(Loss) - Total |  |  | (782) |  | (782)
Foreign Currency Unrealized Gain/(Loss) - Total |  | (2,864) | 1,177 | (3,689) | 1,410
Investments Purchased - Total |  | 8,340 | 18,159 | 17,406 | 18,159
Redemptions/Sale - Total |  | (19,367) | (4,800) | (20,573) | (6,843)
Ending Balance - Total |  | 32,333 | 148,115 | 32,333 | 148,115
ClearPoint Convertible note |  |  |  |  |
Purchase of convertible note |  |  |  | 291,734 |
Marketable securities - equity investments |  |  |  |  |
Changes in fair value |  |  |  |  |
Beginning Balance |  | 30,379 | 108,559 | 22,634 | 108,261
Unrealized Gain/(Loss) |  | 401 | 2,256 | 1,111 | 4,364
Foreign Currency Unrealized Gain/(Loss) |  | (2,864) | 1,177 | (3,689) | 1,410
Investments Purchased |  | 8,340 | 18,159 | 17,406 | 18,159
Redemptions/Sale |  | (19,367) | (2,206) | (20,573) | (4,249)
Ending Balance |  | 16,889 | 127,945 | 16,889 | 127,945
ClearPoint Equity Investment |  |  |  |  |
Changes in fair value |  |  |  |  |
Beginning Balance |  | 6,083 | 10,926 | 6,074 | 10,965
Unrealized Gain/(Loss) |  | (1,261) | (1,073) | (1,252) | (1,112)
Realized Gain/(Loss) |  |  | (782) |  | (782)
Redemptions/Sale |  |  | (2,594) |  | (2,594)
Ending Balance |  | 4,822 | 6,477 | 4,822 | 6,477
ClearPoint convertible debt |  |  |  |  |
Changes in fair value |  |  |  |  |
Beginning Balance |  | 12,719 | 15,290 | 12,553 | 15,231
Unrealized Gain/(Loss) |  | (2,097) | (1,597) | (1,931) | (1,538)
Ending Balance |  | $ 10,622 | $ 13,693 | $ 10,622 | $ 13,693
ClearPoint Convertible note |  |  |  |  |
Purchase of convertible note | $ 10,000 |  |  |  |
Conversion price - convertible note | $ / shares | $ 6.00 |  |  |  |
Term of convertible note | 5 years |  |  |  |
Mutual Funds |  |  |  |  |
Equity Investments |  |  |  |  |
Number of mutual funds denominated in a foreign currency | fund |  |  |  | 1 |

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