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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 | 6 Months Ended
--- | --- | --- | ---
Jan. 31, 2020 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Changes in fair value |  |  |  |  |
Unrealized Gain/(Loss) |  |  |  | $ 1,538 | $ 1,111
Investments Purchased |  |  |  | 17,029 | 17,406
Redemptions/Sale |  |  |  | (17,129) | (20,573)
Unrealized Gain/(Loss) |  |  |  | (3,078) | (1,252)
Unrealized Gain/(Loss) |  |  |  |  | (1,931)
Beginning Balance - Total |  | $ 38,824 | $ 49,181 | 42,793 | 41,261
Unrealized Gain/(Loss) - Total |  | 808 | (2,957) | (1,540) | (2,072)
Foreign Currency Unrealized Gain/(Loss) - Total |  | 1,665 | (2,864) | 3,731 | (3,689)
Investments Purchased - Total |  | 11,820 | 8,340 | 17,029 | 17,406
Redemptions/Sale - Total |  | (8,233) | (19,367) | (17,129) | (20,573)
Ending Balance - Total |  | 44,884 | 32,333 | 44,884 | 32,333
ClearPoint Convertible note |  |  |  |  |
Purchase of convertible note |  |  |  | 847,164 | 291,734
Marketable securities - equity investments |  |  |  |  |
Changes in fair value |  |  |  |  |
Beginning Balance |  | 28,187 | 30,379 | 29,034 | 22,634
Unrealized Gain/(Loss) |  | 764 | 401 | 1,538 | 1,111
Foreign Currency Unrealized Gain/(Loss) |  | 1,665 | (2,864) | 3,731 | (3,689)
Investments Purchased |  | 11,820 | 8,340 | 17,029 | 17,406
Redemptions/Sale |  | (8,233) | (19,367) | (17,129) | (20,573)
Ending Balance |  | 34,203 | 16,889 | 34,203 | 16,889
ClearPoint Equity Investment |  |  |  |  |
Changes in fair value |  |  |  |  |
Beginning Balance |  | 10,637 | 6,083 | 13,759 | 6,074
Unrealized Gain/(Loss) |  | 44 | (1,261) | (3,078) | (1,252)
Ending Balance |  | 10,681 | 4,822 | 10,681 | 4,822
ClearPoint convertible debt |  |  |  |  |
Changes in fair value |  |  |  |  |
Beginning Balance |  |  | 12,719 |  | 12,553
Unrealized Gain/(Loss) |  |  | (2,097) |  | (1,931)
Ending Balance |  | $ 0 | $ 10,622 | $ 0 | $ 10,622
ClearPoint Convertible note |  |  |  |  |
Purchase of convertible note | $ 10,000 |  |  |  |
Conversion price - convertible note | $ 6 |  |  |  |
Term of convertible note | 5 years |  |  |  |

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