Short-term and long-term investments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Debt securities	$ 23,226	$ 8,217
Equity securities, FV-NI	48,598	44,077
Total	71,824	52,294
Debt securities, short-term investments	8,227	8,217
Total Short-term investments	22,310	20,101
Debt securities, long-term investments	14,999	0
Total Long-term investments	49,514	32,193
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	23,226	8,217
Equity securities, FV-NI	0	0
Total	23,226	8,217
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Debt securities	0	0
Equity securities, FV-NI	48,598	44,077
Total	48,598	44,077
Short-term Investments
Investment Holdings [Line Items]
Equity securities, FV-NI	14,083	11,884
Other long-term Investments
Investment Holdings [Line Items]
Equity securities, FV-NI	$ 34,515	$ 32,193

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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