Short-term and long-term investments (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Investment Holdings [Line Items]
Debt securities	$ 24,320	$ 44,158
Equity securities, FV-NI	40,949	40,566
Total	65,269	84,724
Debt securities, short-term investments	19,903	44,158
Total Short-term investments	24,303	51,064
Debt securities, long-term investments	4,417	0
Total Long-term investments	40,966	33,660
Equity Securities, FV-NI	40,949	40,566
Certificates of deposit, bonds and other
Investment Holdings [Line Items]
Debt securities	24,320	44,158
Equity securities, FV-NI	0	0
Total	24,320	44,158
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Debt securities	0	0
Equity securities, FV-NI	40,949	40,566
Total	40,949	40,566
Short-term Investments
Investment Holdings [Line Items]
Equity securities, FV-NI	4,400	6,906
Other long-term Investments
Investment Holdings [Line Items]
Equity Securities, FV-NI, Noncurrent	$ 36,549	$ 33,660

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