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Fair value of financial instruments and marketable securities - Marketable Securities (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2020 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Changes in fair value |  |  |  |  |
Unrealized Gain/(Loss) |  |  |  | $ 3,160 | $ 1,923
Investments Purchased |  |  |  | 46,537 | 49,614
Redemptions/Sale |  |  |  | (40,112) | (41,624)
Unrealized Gain/(Loss) |  |  |  | 5,734 | 3,954
Ending Balance |  |  | $ 10,028 |  | 10,028
Unrealized Gain/(Loss) |  |  |  |  | (1,931)
Realized Loss |  |  |  |  | (622)
Redemptions/Sale |  |  |  |  | (10,000)
Beginning Balance - Total |  | $ 44,884 | 32,333 | 42,793 | 41,261
Unrealized Gain/(Loss) - Total |  | 10,434 | 6,018 | 8,894 | 3,946
Realized Loss - Total |  |  | (622) |  | (622)
Foreign Currency Unrealized Gain/(Loss) - Total |  | 1,605 | 400 | 5,337 | (3,289)
Investments Purchased - Total |  | 29,508 | 32,208 | 46,537 | 49,614
Redemptions/Sale - Total |  | (22,982) | (31,051) | (40,112) | (51,624)
Ending Balance - Total |  | 63,449 | 39,286 | 63,449 | 39,286
ClearPoint Convertible note |  |  |  |  |
Purchase of convertible note |  |  |  | 1,051,267 | 476,680
Marketable securities - equity investments |  |  |  |  |
Changes in fair value |  |  |  |  |
Beginning Balance |  | 34,203 | 16,889 | 29,034 | 22,634
Unrealized Gain/(Loss) |  | 1,622 | 812 | 3,160 | 1,923
Foreign Currency Unrealized Gain/(Loss) |  | 1,605 | 400 | 5,337 | (3,289)
Investments Purchased |  | 29,508 | 32,208 | 46,537 | 49,614
Redemptions/Sale |  | (22,982) | (21,051) | (40,112) | (41,624)
Ending Balance |  | 43,956 | 29,258 | 43,956 | 29,258
ClearPoint Equity Investment |  |  |  |  |
Changes in fair value |  |  |  |  |
Beginning Balance |  | 10,681 | 4,822 | 13,759 | 6,074
Unrealized Gain/(Loss) |  | 8,812 | 5,206 | 5,734 | 3,954
Ending Balance |  | 19,493 | 10,028 | 19,493 | 10,028
ClearPoint convertible debt |  |  |  |  |
Changes in fair value |  |  |  |  |
Redemptions/Sale |  |  | (10,000) |  | (10,000)
Beginning Balance |  |  | 10,622 |  | 12,553
Unrealized Gain/(Loss) |  |  |  |  | (1,931)
Realized Loss |  |  | $ (622) |  | $ (622)
Ending Balance |  | $ 0 |  | $ 0 |
ClearPoint Convertible note |  |  |  |  |
Purchase of convertible note | $ 10,000 |  |  |  |
Conversion price - convertible note | $ 6 |  |  |  |
Term of convertible note | 5 years |  |  |  |

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