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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
--- | --- | ---
Jan. 31, 2020 USD ($) $ / shares | Mar. 31, 2024 USD ($) fund | Mar. 31, 2023 USD ($)
Changes in fair value |  |  |
Unrealized Gain/(Loss) |  | $ 710 | $ 2,166
Investments Purchased |  | 9,065 |
Redemptions/Sale |  | (1,207) | (2,196)
Unrealized Gain/(Loss) |  | 9 | (39)
Unrealized Gain/(Loss) |  | 166 | 59
Beginning Balance - Total |  | 41,261 | 134,457
Unrealized Gain/(Loss) - Total |  | 885 | 2,186
Foreign Currency Unrealized Gain/(Loss) - Total |  | (823) | 328
Investments Purchased - Total |  | 9,065 |
Redemptions/Sale - Total |  | (1,207) | (2,196)
Ending Balance - Total |  | 49,181 | 134,775
ClearPoint Convertible note |  |  |
Purchase of convertible note |  | 104,373 |
Marketable securities - equity investments |  |  |
Changes in fair value |  |  |
Beginning Balance |  | 22,634 | 108,261
Unrealized Gain/(Loss) |  | 710 | 2,166
Foreign Currency Unrealized Gain/(Loss) |  | (823) | 328
Investments Purchased |  | 9,065 |
Redemptions/Sale |  | (1,207) | (2,196)
Ending Balance |  | 30,379 | 108,559
ClearPoint Equity Investment |  |  |
Changes in fair value |  |  |
Beginning Balance |  | 6,074 | 10,965
Unrealized Gain/(Loss) |  | 9 | (39)
Ending Balance |  | 6,083 | 10,926
ClearPoint convertible debt |  |  |
Changes in fair value |  |  |
Beginning Balance |  | 12,553 | 15,231
Unrealized Gain/(Loss) |  | 166 | 59
Ending Balance |  | $ 12,719 | $ 15,290
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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