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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